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rules_linux.json
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rules_linux.json
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[
{
"title": "Guacamole Two Users Sharing Session Anomaly",
"id": "1edd77db-0669-4fef-9598-165bda82826d",
"description": "Detects suspicious session with two users present",
"author": "Florian Roth (Nextron Systems)",
"tags": [
"attack.credential-access",
"attack.t1212"
],
"falsepositives": [
"Unknown"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE logs MATCH ('\"(2 users now present)\"')"
],
"filename": "lnx_guacamole_susp_guacamole.yml"
},
{
"title": "Modifying Crontab",
"id": "af202fd3-7bff-4212-a25a-fb34606cfcbe",
"description": "Detects suspicious modification of crontab file.",
"author": "Pawel Mazur",
"tags": [
"attack.persistence",
"attack.t1053.003"
],
"falsepositives": [
"Legitimate modification of crontab"
],
"level": "medium",
"rule": [
"SELECT * FROM logs WHERE logs MATCH ('\"REPLACE\"')"
],
"filename": "lnx_cron_crontab_file_modification.yml"
},
{
"title": "PwnKit Local Privilege Escalation",
"id": "0506a799-698b-43b4-85a1-ac4c84c720e9",
"description": "Detects potential PwnKit exploitation CVE-2021-4034 in auth logs",
"author": "Sreeman",
"tags": [
"attack.privilege-escalation",
"attack.t1548.001"
],
"falsepositives": [
"Unknown"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE ( = 'pkexec' AND = 'The value for environment variable XAUTHORITY contains suspicious content' AND = '[USER=root] [TTY=/dev/pts/0]')"
],
"filename": "lnx_auth_pwnkit_local_privilege_escalation.yml"
},
{
"title": "Sudo Privilege Escalation CVE-2019-14287 - Builtin",
"id": "7fcc54cb-f27d-4684-84b7-436af096f858",
"description": "Detects users trying to exploit sudo vulnerability reported in CVE-2019-14287",
"author": "Florian Roth (Nextron Systems)",
"tags": [
"attack.privilege-escalation",
"attack.t1068",
"attack.t1548.003",
"cve.2019-14287"
],
"falsepositives": [
"Unlikely"
],
"level": "critical",
"rule": [
"SELECT * FROM logs WHERE (USER LIKE '#-%' ESCAPE '\\' OR USER LIKE '#%4294967295' ESCAPE '\\')"
],
"filename": "lnx_sudo_cve_2019_14287_user.yml"
},
{
"title": "Code Injection by ld.so Preload",
"id": "7e3c4651-c347-40c4-b1d4-d48590fdf684",
"description": "Detects the ld.so preload persistence file. See `man ld.so` for more information.",
"author": "Christian Burkard (Nextron Systems)",
"tags": [
"attack.persistence",
"attack.privilege-escalation",
"attack.t1574.006"
],
"falsepositives": [
"Rare temporary workaround for library misconfiguration"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE logs MATCH ('\"/etc/ld.so.preload\"')"
],
"filename": "lnx_ldso_preload_injection.yml"
},
{
"title": "Disabling Security Tools - Builtin",
"id": "49f5dfc1-f92e-4d34-96fa-feba3f6acf36",
"description": "Detects disabling security tools",
"author": "Ömer Günal, Alejandro Ortuno, oscd.community",
"tags": [
"attack.defense-evasion",
"attack.t1562.004"
],
"falsepositives": [
"Legitimate administration activities"
],
"level": "medium",
"rule": [
"SELECT * FROM logs WHERE (logs MATCH ('\"stopping iptables\" OR \"stopping ip6tables\" OR \"stopping firewalld\" OR \"stopping cbdaemon\" OR \"stopping falcon-sensor\"'))"
],
"filename": "lnx_syslog_security_tools_disabling_syslog.yml"
},
{
"title": "Suspicious Named Error",
"id": "c8e35e96-19ce-4f16-aeb6-fd5588dc5365",
"description": "Detects suspicious DNS error messages that indicate a fatal or suspicious error that could be caused by exploiting attempts",
"author": "Florian Roth (Nextron Systems)",
"tags": [
"attack.initial-access",
"attack.t1190"
],
"falsepositives": [
"Unknown"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE (logs MATCH ('\" dropping source port zero packet from \" OR \" denied AXFR from \" OR \" exiting (due to fatal error)\"'))"
],
"filename": "lnx_syslog_susp_named.yml"
},
{
"title": "Suspicious Log Entries",
"id": "f64b6e9a-5d9d-48a5-8289-e1dd2b3876e1",
"description": "Detects suspicious log entries in Linux log files",
"author": "Florian Roth (Nextron Systems)",
"tags": [
"attack.impact"
],
"falsepositives": [
"Unknown"
],
"level": "medium",
"rule": [
"SELECT * FROM logs WHERE (logs MATCH ('\"entered promiscuous mode\" OR \"Deactivating service\" OR \"Oversized packet received from\" OR \"imuxsock begins to drop messages\"'))"
],
"filename": "lnx_shell_susp_log_entries.yml"
},
{
"title": "Nimbuspwn Exploitation",
"id": "7ba05b43-adad-4c02-b5e9-c8c35cdf9fa8",
"description": "Detects exploitation of Nimbuspwn privilege escalation vulnerability (CVE-2022-29799 and CVE-2022-29800)",
"author": "Bhabesh Raj",
"tags": [
"attack.privilege-escalation",
"attack.t1068"
],
"falsepositives": [
"Unknown"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE ( = 'networkd-dispatcher' AND = 'Error handling notification for interface' AND = '../../')"
],
"filename": "lnx_nimbuspwn_privilege_escalation_exploit.yml"
},
{
"title": "JexBoss Command Sequence",
"id": "8ec2c8b4-557a-4121-b87c-5dfb3a602fae",
"description": "Detects suspicious command sequence that JexBoss",
"author": "Florian Roth (Nextron Systems)",
"tags": [
"attack.execution",
"attack.t1059.004"
],
"falsepositives": [
"Unknown"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE (logs MATCH ('\"bash -c /bin/bash\" AND \"&/dev/tcp/\"'))"
],
"filename": "lnx_susp_jexboss.yml"
},
{
"title": "Shellshock Expression",
"id": "c67e0c98-4d39-46ee-8f6b-437ebf6b950e",
"description": "Detects shellshock expressions in log files",
"author": "Florian Roth (Nextron Systems)",
"tags": [
"attack.persistence",
"attack.t1505.003"
],
"falsepositives": [
"Unknown"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE (logs MATCH ('\"(){:;};\" OR \"() {:;};\" OR \"() { :;};\" OR \"() { :; };\"'))"
],
"filename": "lnx_shellshock.yml"
},
{
"title": "Symlink Etc Passwd",
"id": "c67fc22a-0be5-4b4f-aad5-2b32c4b69523",
"description": "Detects suspicious command lines that look as if they would create symbolic links to /etc/passwd",
"author": "Florian Roth (Nextron Systems)",
"tags": [
"attack.t1204.001",
"attack.execution"
],
"falsepositives": [
"Unknown"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE (logs MATCH ('\"ln -s -f /etc/passwd\" OR \"ln -s /etc/passwd\"'))"
],
"filename": "lnx_symlink_etc_passwd.yml"
},
{
"title": "Screen Capture with Xwd",
"id": "e2f17c5d-b02a-442b-9052-6eb89c9fec9c",
"description": "Detects adversary creating screen capture of a full with xwd. Highly recommended using rule on servers, due high usage of screenshot utilities on user workstations",
"author": "Pawel Mazur",
"tags": [
"attack.collection",
"attack.t1113"
],
"falsepositives": [
"Legitimate use of screenshot utility"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE ((type = 'EXECVE' AND a0 = 'xwd') AND ((a1 = '-root' AND a2 = '-out' AND a3 LIKE '%.xwd' ESCAPE '\\') OR (a1 = '-out' AND a2 LIKE '%.xwd' ESCAPE '\\')))"
],
"filename": "lnx_auditd_screencaputre_xwd.yml"
},
{
"title": "Network Sniffing - Linux",
"id": "f4d3748a-65d1-4806-bd23-e25728081d01",
"description": "Network sniffing refers to using the network interface on a system to monitor or capture information sent over a wired or wireless connection.\nAn adversary may place a network interface into promiscuous mode to passively access data in transit over the network, or use span ports to capture a larger amount of data.\n",
"author": "Timur Zinniatullin, oscd.community",
"tags": [
"attack.credential-access",
"attack.discovery",
"attack.t1040"
],
"falsepositives": [
"Legitimate administrator or user uses network sniffing tool for legitimate reasons."
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE ((type = 'execve' AND a0 = 'tcpdump' AND a1 = '-c' AND a3 LIKE '%-i%' ESCAPE '\\') OR (type = 'execve' AND a0 = 'tshark' AND a1 = '-c' AND a3 = '-i'))"
],
"filename": "lnx_auditd_network_sniffing.yml"
},
{
"title": "Program Executions in Suspicious Folders",
"id": "a39d7fa7-3fbd-4dc2-97e1-d87f546b1bbc",
"description": "Detects program executions in suspicious non-program folders related to malware or hacking activity",
"author": "Florian Roth (Nextron Systems)",
"tags": [
"attack.t1587",
"attack.t1584",
"attack.resource-development"
],
"falsepositives": [
"Admin activity (especially in /tmp folders)",
"Crazy web applications"
],
"level": "medium",
"rule": [
"SELECT * FROM logs WHERE (type = 'SYSCALL' AND (exe LIKE '/tmp/%' ESCAPE '\\' OR exe LIKE '/var/www/%' ESCAPE '\\' OR exe LIKE '/home/%/public\\_html/%' ESCAPE '\\' OR exe LIKE '/usr/local/apache2/%' ESCAPE '\\' OR exe LIKE '/usr/local/httpd/%' ESCAPE '\\' OR exe LIKE '/var/apache/%' ESCAPE '\\' OR exe LIKE '/srv/www/%' ESCAPE '\\' OR exe LIKE '/home/httpd/html/%' ESCAPE '\\' OR exe LIKE '/srv/http/%' ESCAPE '\\' OR exe LIKE '/usr/share/nginx/html/%' ESCAPE '\\' OR exe LIKE '/var/lib/pgsql/data/%' ESCAPE '\\' OR exe LIKE '/usr/local/mysql/data/%' ESCAPE '\\' OR exe LIKE '/var/lib/mysql/%' ESCAPE '\\' OR exe LIKE '/var/vsftpd/%' ESCAPE '\\' OR exe LIKE '/etc/bind/%' ESCAPE '\\' OR exe LIKE '/var/named/%' ESCAPE '\\'))"
],
"filename": "lnx_auditd_susp_exe_folders.yml"
},
{
"title": "System Information Discovery - Auditd",
"id": "f34047d9-20d3-4e8b-8672-0a35cc50dc71",
"description": "Detects System Information Discovery commands",
"author": "Pawel Mazur",
"tags": [
"attack.discovery",
"attack.t1082"
],
"falsepositives": [
"Likely"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE ((type = 'PATH' AND name IN ('/etc/lsb-release', '/etc/redhat-release', '/etc/issue')) OR (type = 'EXECVE' AND a0 IN ('uname', 'uptime', 'lsmod', 'hostname', 'env')) OR (type = 'EXECVE' AND a0 = 'grep' AND (a1 LIKE '%vbox%' ESCAPE '\\' OR a1 LIKE '%vm%' ESCAPE '\\' OR a1 LIKE '%xen%' ESCAPE '\\' OR a1 LIKE '%virtio%' ESCAPE '\\' OR a1 LIKE '%hv%' ESCAPE '\\')) OR (type = 'EXECVE' AND a0 = 'kmod' AND a1 = 'list'))"
],
"filename": "lnx_auditd_system_info_discovery.yml"
},
{
"title": "Overwriting the File with Dev Zero or Null",
"id": "37222991-11e9-4b6d-8bdf-60fbe48f753e",
"description": "Detects overwriting (effectively wiping/deleting) of a file.",
"author": "Jakob Weinzettl, oscd.community",
"tags": [
"attack.impact",
"attack.t1485"
],
"falsepositives": [
"Appending null bytes to files.",
"Legitimate overwrite of files."
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND a0 LIKE '%dd%' ESCAPE '\\' AND (a1 LIKE '%if=/dev/null%' ESCAPE '\\' OR a1 LIKE '%if=/dev/zero%' ESCAPE '\\'))"
],
"filename": "lnx_auditd_dd_delete_file.yml"
},
{
"title": "Linux Capabilities Discovery",
"id": "fe10751f-1995-40a5-aaa2-c97ccb4123fe",
"description": "Detects attempts to discover the files with setuid/setgid capability on them. That would allow adversary to escalate their privileges.",
"author": "Pawel Mazur",
"tags": [
"attack.collection",
"attack.privilege-escalation",
"attack.t1123",
"attack.t1548"
],
"falsepositives": [
"Unknown"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND a0 = 'getcap' AND a1 = '-r' AND a2 = '/')"
],
"filename": "lnx_auditd_capabilities_discovery.yml"
},
{
"title": "Split A File Into Pieces - Linux",
"id": "2dad0cba-c62a-4a4f-949f-5f6ecd619769",
"description": "Detection use of the command \"split\" to split files into parts and possible transfer.",
"author": "Igor Fits, oscd.community",
"tags": [
"attack.exfiltration",
"attack.t1030"
],
"falsepositives": [
"Legitimate administrative activity"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE (type = 'SYSCALL' AND comm = 'split')"
],
"filename": "lnx_auditd_split_file_into_pieces.yml"
},
{
"title": "BPFDoor Abnormal Process ID or Lock File Accessed",
"id": "808146b2-9332-4d78-9416-d7e47012d83d",
"description": "detects BPFDoor .lock and .pid files access in temporary file storage facility",
"author": "Rafal Piasecki",
"tags": [
"attack.execution",
"attack.t1106",
"attack.t1059"
],
"falsepositives": [
"Unlikely"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE (type = 'PATH' AND name IN ('/var/run/haldrund.pid', '/var/run/xinetd.lock', '/var/run/kdevrund.pid'))"
],
"filename": "lnx_auditd_bpfdoor_file_accessed.yml"
},
{
"title": "Suspicious Commands Linux",
"id": "1543ae20-cbdf-4ec1-8d12-7664d667a825",
"description": "Detects relevant commands often related to malware or hacking activity",
"author": "Florian Roth (Nextron Systems)",
"tags": [
"attack.execution",
"attack.t1059.004"
],
"falsepositives": [
"Admin activity"
],
"level": "medium",
"rule": [
"SELECT * FROM logs WHERE ((type = 'EXECVE' AND a0 = 'chmod' AND a1 = '777') OR (type = 'EXECVE' AND a0 = 'chmod' AND a1 = 'u+s') OR (type = 'EXECVE' AND a0 = 'cp' AND a1 = '/bin/ksh') OR (type = 'EXECVE' AND a0 = 'cp' AND a1 = '/bin/sh'))"
],
"filename": "lnx_auditd_susp_cmds.yml"
},
{
"title": "Masquerading as Linux Crond Process",
"id": "9d4548fa-bba0-4e88-bd66-5d5bf516cda0",
"description": "Masquerading occurs when the name or location of an executable, legitimate or malicious, is manipulated or abused for the sake of evading defenses and observation.\nSeveral different variations of this technique have been observed.\n",
"author": "Timur Zinniatullin, oscd.community",
"tags": [
"attack.defense-evasion",
"attack.t1036.003"
],
"level": "medium",
"rule": [
"SELECT * FROM logs WHERE (type = 'execve' AND a0 = 'cp' AND a1 = '/bin/sh' AND a2 LIKE '%/crond' ESCAPE '\\')"
],
"filename": "lnx_auditd_masquerading_crond.yml"
},
{
"title": "Remove Immutable File Attribute - Auditd",
"id": "a5b977d6-8a81-4475-91b9-49dbfcd941f7",
"description": "Detects removing immutable file attribute.",
"author": "Jakob Weinzettl, oscd.community",
"tags": [
"attack.defense-evasion",
"attack.t1222.002"
],
"falsepositives": [
"Administrator interacting with immutable files (e.g. for instance backups)."
],
"level": "medium",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND a0 LIKE '%chattr%' ESCAPE '\\' AND a1 LIKE '%-i%' ESCAPE '\\')"
],
"filename": "lnx_auditd_chattr_immutable_removal.yml"
},
{
"title": "System Owner or User Discovery",
"id": "9a0d8ca0-2385-4020-b6c6-cb6153ca56f3",
"description": "Adversaries may use the information from System Owner/User Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.",
"author": "Timur Zinniatullin, oscd.community",
"tags": [
"attack.discovery",
"attack.t1033"
],
"falsepositives": [
"Admin activity"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND a0 IN ('users', 'w', 'who'))"
],
"filename": "lnx_auditd_user_discovery.yml"
},
{
"title": "Linux Keylogging with Pam.d",
"id": "49aae26c-450e-448b-911d-b3c13d178dfc",
"description": "Detect attempt to enable auditing of TTY input",
"author": "Pawel Mazur",
"tags": [
"attack.credential-access",
"attack.t1003",
"attack.t1056.001"
],
"falsepositives": [
"Administrative work"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE ((type = 'PATH' AND name IN ('/etc/pam.d/system-auth', '/etc/pam.d/password-auth')) OR (type LIKE 'TTY' ESCAPE '\\' OR type LIKE 'USER\\_TTY' ESCAPE '\\'))"
],
"filename": "lnx_auditd_keylogging_with_pam_d.yml"
},
{
"title": "Systemd Service Reload or Start",
"id": "2625cc59-0634-40d0-821e-cb67382a3dd7",
"description": "Detects a reload or a start of a service.",
"author": "Jakob Weinzettl, oscd.community",
"tags": [
"attack.persistence",
"attack.t1543.002"
],
"falsepositives": [
"Installation of legitimate service.",
"Legitimate reconfiguration of service."
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND a0 LIKE '%systemctl%' ESCAPE '\\' AND (a1 LIKE '%daemon-reload%' ESCAPE '\\' OR a1 LIKE '%start%' ESCAPE '\\'))"
],
"filename": "lnx_auditd_pers_systemd_reload.yml"
},
{
"title": "Disable System Firewall",
"id": "53059bc0-1472-438b-956a-7508a94a91f0",
"description": "Detects disabling of system firewalls which could be used by adversaries to bypass controls that limit usage of the network.",
"author": "Pawel Mazur",
"tags": [
"attack.t1562.004",
"attack.defense-evasion"
],
"falsepositives": [
"Admin activity"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE (type LIKE 'SERVICE\\_STOP' ESCAPE '\\' AND unit IN ('firewalld', 'iptables', 'ufw'))"
],
"filename": "lnx_auditd_disable_system_firewall.yml"
},
{
"title": "Bpfdoor TCP Ports Redirect",
"id": "70b4156e-50fc-4523-aa50-c9dddf1993fc",
"description": "All TCP traffic on particular port from attacker is routed to different port. ex. '/sbin/iptables -t nat -D PREROUTING -p tcp -s 192.168.1.1 --dport 22 -j REDIRECT --to-ports 42392'\nThe traffic looks like encrypted SSH communications going to TCP port 22, but in reality is being directed to the shell port once it hits the iptables rule for the attacker host only.\n",
"author": "Rafal Piasecki",
"tags": [
"attack.defense-evasion",
"attack.t1562.004"
],
"falsepositives": [
"Legitimate ports redirect"
],
"level": "medium",
"rule": [
"SELECT * FROM logs WHERE ((type = 'EXECVE' AND a0 LIKE '%iptables' ESCAPE '\\' AND a1 = '-t' AND a2 = 'nat') AND (logs MATCH ('\"--to-ports 42\" OR \"--to-ports 43\"')))"
],
"filename": "lnx_auditd_bpfdoor_port_redirect.yml"
},
{
"title": "Unix Shell Configuration Modification",
"id": "a94cdd87-6c54-4678-a6cc-2814ffe5a13d",
"description": "Detect unix shell configuration modification. Adversaries may establish persistence through executing malicious commands triggered when a new shell is opened.",
"author": "Peter Matkovski, IAI",
"tags": [
"attack.persistence",
"attack.t1546.004"
],
"falsepositives": [
"Admin or User activity are expected to generate some false positives"
],
"level": "medium",
"rule": [
"SELECT * FROM logs WHERE (type = 'PATH' AND (name LIKE '/etc/shells' ESCAPE '\\' OR name LIKE '/etc/profile' ESCAPE '\\' OR name LIKE '/etc/profile.d/%' ESCAPE '\\' OR name LIKE '/etc/bash.bashrc' ESCAPE '\\' OR name LIKE '/etc/bashrc' ESCAPE '\\' OR name LIKE '/etc/zsh/zprofile' ESCAPE '\\' OR name LIKE '/etc/zsh/zshrc' ESCAPE '\\' OR name LIKE '/etc/zsh/zlogin' ESCAPE '\\' OR name LIKE '/etc/zsh/zlogout' ESCAPE '\\' OR name LIKE '/etc/csh.cshrc' ESCAPE '\\' OR name LIKE '/etc/csh.login' ESCAPE '\\' OR name LIKE '/root/.bashrc' ESCAPE '\\' OR name LIKE '/root/.bash\\_profile' ESCAPE '\\' OR name LIKE '/root/.profile' ESCAPE '\\' OR name LIKE '/root/.zshrc' ESCAPE '\\' OR name LIKE '/root/.zprofile' ESCAPE '\\' OR name LIKE '/home/%/.bashrc' ESCAPE '\\' OR name LIKE '/home/%/.zshrc' ESCAPE '\\' OR name LIKE '/home/%/.bash\\_profile' ESCAPE '\\' OR name LIKE '/home/%/.zprofile' ESCAPE '\\' OR name LIKE '/home/%/.profile' ESCAPE '\\' OR name LIKE '/home/%/.bash\\_login' ESCAPE '\\' OR name LIKE '/home/%/.bash\\_logout' ESCAPE '\\' OR name LIKE '/home/%/.zlogin' ESCAPE '\\' OR name LIKE '/home/%/.zlogout' ESCAPE '\\'))"
],
"filename": "lnx_auditd_unix_shell_configuration_modification.yml"
},
{
"title": "Linux Network Service Scanning - Auditd",
"id": "3761e026-f259-44e6-8826-719ed8079408",
"description": "Detects enumeration of local or remote network services.",
"author": "Alejandro Ortuno, oscd.community",
"tags": [
"attack.discovery",
"attack.t1046"
],
"falsepositives": [
"Legitimate administration activities"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE (type = 'SYSCALL' AND (exe LIKE '%/telnet' ESCAPE '\\' OR exe LIKE '%/nmap' ESCAPE '\\' OR exe LIKE '%/netcat' ESCAPE '\\' OR exe LIKE '%/nc' ESCAPE '\\' OR exe LIKE '%/ncat' ESCAPE '\\' OR exe LIKE '%/nc.openbsd' ESCAPE '\\') AND key LIKE 'network\\_connect\\_4' ESCAPE '\\')"
],
"filename": "lnx_auditd_network_service_scanning.yml"
},
{
"title": "Steganography Extract Files with Steghide",
"id": "a5a827d9-1bbe-4952-9293-c59d897eb41b",
"description": "Detects extraction of files with usage of steghide binary, the adversaries may use this technique to prevent the detection of hidden information.",
"author": "Pawel Mazur",
"tags": [
"attack.defense-evasion",
"attack.t1027.003"
],
"falsepositives": [
"Unknown"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND a0 = 'steghide' AND a1 = 'extract' AND a2 = '-sf' AND (a3 LIKE '%.jpg' ESCAPE '\\' OR a3 LIKE '%.png' ESCAPE '\\'))"
],
"filename": "lnx_auditd_steghide_extract_steganography.yml"
},
{
"title": "Auditing Configuration Changes on Linux Host",
"id": "977ef627-4539-4875-adf4-ed8f780c4922",
"description": "Detect changes in auditd configuration files",
"author": "Mikhail Larin, oscd.community",
"tags": [
"attack.defense-evasion",
"attack.t1562.006"
],
"falsepositives": [
"Legitimate administrative activity"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE (type = 'PATH' AND (name LIKE '/etc/audit/%' ESCAPE '\\' OR name LIKE '/etc/libaudit.conf' ESCAPE '\\' OR name LIKE '/etc/audisp/%' ESCAPE '\\'))"
],
"filename": "lnx_auditd_auditing_config_change.yml"
},
{
"title": "Logging Configuration Changes on Linux Host",
"id": "c830f15d-6f6e-430f-8074-6f73d6807841",
"description": "Detect changes of syslog daemons configuration files",
"author": "Mikhail Larin, oscd.community",
"tags": [
"attack.defense-evasion",
"attack.t1562.006"
],
"falsepositives": [
"Legitimate administrative activity"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE (type = 'PATH' AND name IN ('/etc/syslog.conf', '/etc/rsyslog.conf', '/etc/syslog-ng/syslog-ng.conf'))"
],
"filename": "lnx_auditd_logging_config_change.yml"
},
{
"title": "Screen Capture with Import Tool",
"id": "dbe4b9c5-c254-4258-9688-d6af0b7967fd",
"description": "Detects adversary creating screen capture of a desktop with Import Tool.\nHighly recommended using rule on servers, due to high usage of screenshot utilities on user workstations.\nImageMagick must be installed.\n",
"author": "Pawel Mazur",
"tags": [
"attack.collection",
"attack.t1113"
],
"falsepositives": [
"Legitimate use of screenshot utility"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE ((type = 'EXECVE' AND a0 = 'import') AND ((a1 = '-window' AND a2 = 'root' AND (a3 LIKE '%.png' ESCAPE '\\' OR a3 LIKE '%.jpg' ESCAPE '\\' OR a3 LIKE '%.jpeg' ESCAPE '\\')) OR (a1 LIKE '%.png' ESCAPE '\\' OR a1 LIKE '%.jpg' ESCAPE '\\' OR a1 LIKE '%.jpeg' ESCAPE '\\')))"
],
"filename": "lnx_auditd_screencapture_import.yml"
},
{
"title": "System and Hardware Information Discovery",
"id": "1f358e2e-cb63-43c3-b575-dfb072a6814f",
"description": "Detects system information discovery commands",
"author": "Ömer Günal, oscd.community",
"tags": [
"attack.discovery",
"attack.t1082"
],
"falsepositives": [
"Legitimate administration activities"
],
"level": "informational",
"rule": [
"SELECT * FROM logs WHERE (type = 'PATH' AND (name LIKE '/sys/class/dmi/id/bios\\_version' ESCAPE '\\' OR name LIKE '/sys/class/dmi/id/product\\_name' ESCAPE '\\' OR name LIKE '/sys/class/dmi/id/chassis\\_vendor' ESCAPE '\\' OR name LIKE '/proc/scsi/scsi' ESCAPE '\\' OR name LIKE '/proc/ide/hd0/model' ESCAPE '\\' OR name LIKE '/proc/version' ESCAPE '\\' OR name LIKE '/etc/%version' ESCAPE '\\' OR name LIKE '/etc/%release' ESCAPE '\\' OR name LIKE '/etc/issue' ESCAPE '\\'))"
],
"filename": "lnx_auditd_system_info_discovery2.yml"
},
{
"title": "Possible Coin Miner CPU Priority Param",
"id": "071d5e5a-9cef-47ec-bc4e-a42e34d8d0ed",
"description": "Detects command line parameter very often used with coin miners",
"author": "Florian Roth (Nextron Systems)",
"tags": [
"attack.privilege-escalation",
"attack.t1068"
],
"falsepositives": [
"Other tools that use a --cpu-priority flag"
],
"level": "critical",
"rule": [
"SELECT * FROM logs WHERE (a1 LIKE '--cpu-priority%' ESCAPE '\\' OR a2 LIKE '--cpu-priority%' ESCAPE '\\' OR a3 LIKE '--cpu-priority%' ESCAPE '\\' OR a4 LIKE '--cpu-priority%' ESCAPE '\\' OR a5 LIKE '--cpu-priority%' ESCAPE '\\' OR a6 LIKE '--cpu-priority%' ESCAPE '\\' OR a7 LIKE '--cpu-priority%' ESCAPE '\\')"
],
"filename": "lnx_auditd_coinminer.yml"
},
{
"title": "Clipboard Collection with Xclip Tool - Auditd",
"id": "214e7e6c-f21b-47ff-bb6f-551b2d143fcf",
"description": "Detects attempts to collect data stored in the clipboard from users with the usage of xclip tool.\nXclip has to be installed.\nHighly recommended using rule on servers, due to high usage of clipboard utilities on user workstations.\n",
"author": "Pawel Mazur",
"tags": [
"attack.collection",
"attack.t1115"
],
"falsepositives": [
"Legitimate usage of xclip tools"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND a0 = 'xclip' AND a1 IN ('-selection', '-sel') AND a2 IN ('clipboard', 'clip') AND a3 = '-o')"
],
"filename": "lnx_auditd_clipboard_collection.yml"
},
{
"title": "Modification of ld.so.preload",
"id": "4b3cb710-5e83-4715-8c45-8b2b5b3e5751",
"description": "Identifies modification of ld.so.preload for shared object injection. This technique is used by attackers to load arbitrary code into processes.",
"author": "E.M. Anhaus (originally from Atomic Blue Detections, Tony Lambert), oscd.community",
"tags": [
"attack.defense-evasion",
"attack.t1574.006"
],
"falsepositives": [
"Unknown"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE (type = 'PATH' AND name = '/etc/ld.so.preload')"
],
"filename": "lnx_auditd_ld_so_preload_mod.yml"
},
{
"title": "Hidden Files and Directories",
"id": "d08722cd-3d09-449a-80b4-83ea2d9d4616",
"description": "Detects adversary creating hidden file or directory, by detecting directories or files with . as the first character",
"author": "Pawel Mazur",
"tags": [
"attack.defense-evasion",
"attack.t1564.001"
],
"falsepositives": [
"Unknown"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE ((type = 'EXECVE' AND a0 IN ('mkdir', 'touch', 'vim', 'nano', 'vi')) AND (a1 LIKE '%/.%' ESCAPE '\\' OR a1 LIKE '.%' ESCAPE '\\' OR a2 LIKE '%/.%' ESCAPE '\\' OR a2 LIKE '.%' ESCAPE '\\'))"
],
"filename": "lnx_auditd_hidden_files_directories.yml"
},
{
"title": "Steganography Hide Files with Steghide",
"id": "ce446a9e-30b9-4483-8e38-d2c9ad0a2280",
"description": "Detects embedding of files with usage of steghide binary, the adversaries may use this technique to prevent the detection of hidden information.",
"author": "Pawel Mazur",
"tags": [
"attack.defense-evasion",
"attack.t1027.003"
],
"falsepositives": [
"Unknown"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND a0 = 'steghide' AND a1 = 'embed' AND a2 IN ('-cf', '-ef') AND a4 IN ('-cf', '-ef'))"
],
"filename": "lnx_auditd_steghide_embed_steganography.yml"
},
{
"title": "Clipboard Collection of Image Data with Xclip Tool",
"id": "f200dc3f-b219-425d-a17e-c38467364816",
"description": "Detects attempts to collect image data stored in the clipboard from users with the usage of xclip tool.\nXclip has to be installed.\nHighly recommended using rule on servers, due to high usage of clipboard utilities on user workstations.\n",
"author": "Pawel Mazur",
"tags": [
"attack.collection",
"attack.t1115"
],
"falsepositives": [
"Legitimate usage of xclip tools"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND a0 = 'xclip' AND a1 IN ('-selection', '-sel') AND a2 IN ('clipboard', 'clip') AND a3 = '-t' AND a4 LIKE 'image/%' ESCAPE '\\' AND a5 = '-o')"
],
"filename": "lnx_auditd_clipboard_image_collection.yml"
},
{
"title": "Creation Of An User Account",
"id": "759d0d51-bc99-4b5e-9add-8f5b2c8e7512",
"description": "Detects the creation of a new user account. Such accounts may be used for persistence that do not require persistent remote access tools to be deployed on the system.",
"author": "Marie Euler, Pawel Mazur",
"tags": [
"attack.t1136.001",
"attack.persistence"
],
"falsepositives": [
"Admin activity"
],
"level": "medium",
"rule": [
"SELECT * FROM logs WHERE ((type = 'SYSCALL' AND exe LIKE '%/useradd' ESCAPE '\\') OR type LIKE 'ADD\\_USER' ESCAPE '\\')"
],
"filename": "lnx_auditd_create_account.yml"
},
{
"title": "File or Folder Permissions Change",
"id": "74c01ace-0152-4094-8ae2-6fd776dd43e5",
"description": "Detects file and folder permission changes.",
"author": "Jakob Weinzettl, oscd.community",
"tags": [
"attack.defense-evasion",
"attack.t1222.002"
],
"falsepositives": [
"User interacting with files permissions (normal/daily behaviour)."
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND (a0 LIKE '%chmod%' ESCAPE '\\' OR a0 LIKE '%chown%' ESCAPE '\\'))"
],
"filename": "lnx_auditd_file_or_folder_permissions.yml"
},
{
"title": "Modify System Firewall",
"id": "323ff3f5-0013-4847-bbd4-250b5edb62cc",
"description": "Detects the removal of system firewall rules. Adversaries may only delete or modify a specific system firewall rule to bypass controls limiting network usage or access.\nDetection rules that match only on the disabling of firewalls will miss this.\n",
"author": "IAI",
"tags": [
"attack.t1562.004",
"attack.defense-evasion"
],
"falsepositives": [
"Legitimate admin activity"
],
"level": "medium",
"rule": [
"SELECT * FROM logs WHERE ((type = 'EXECVE' AND a0 = 'iptables' AND a1 LIKE '%DROP%' ESCAPE '\\') OR (type = 'EXECVE' AND a0 = 'firewall-cmd' AND a1 LIKE '%remove%' ESCAPE '\\') OR (type = 'EXECVE' AND a0 = 'ufw' AND a1 LIKE '%delete%' ESCAPE '\\'))"
],
"filename": "lnx_auditd_modify_system_firewall.yml"
},
{
"title": "Data Compressed",
"id": "a3b5e3e9-1b49-4119-8b8e-0344a01f21ee",
"description": "An adversary may compress data (e.g., sensitive documents) that is collected prior to exfiltration in order to make it portable and minimize the amount of data sent over the network.",
"author": "Timur Zinniatullin, oscd.community",
"tags": [
"attack.exfiltration",
"attack.t1560.001"
],
"falsepositives": [
"Legitimate use of archiving tools by legitimate user."
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE ((type = 'execve' AND a0 = 'zip') OR (type = 'execve' AND a0 = 'gzip' AND a1 = '-k') OR (type = 'execve' AND a0 = 'tar' AND a1 LIKE '%-c%' ESCAPE '\\'))"
],
"filename": "lnx_auditd_data_compressed.yml"
},
{
"title": "Credentials In Files - Linux",
"id": "df3fcaea-2715-4214-99c5-0056ea59eb35",
"description": "Detecting attempts to extract passwords with grep",
"author": "Igor Fits, oscd.community",
"tags": [
"attack.credential-access",
"attack.t1552.001"
],
"falsepositives": [
"Unknown"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND = 'grep' AND = 'password')"
],
"filename": "lnx_auditd_find_cred_in_files.yml"
},
{
"title": "Use Of Hidden Paths Or Files",
"id": "9e1bef8d-0fff-46f6-8465-9aa54e128c1e",
"description": "Detects calls to hidden files or files located in hidden directories in NIX systems.",
"author": "David Burkett, @signalblur",
"tags": [
"attack.defense-evasion",
"attack.t1574.001"
],
"falsepositives": [
"Unknown"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE ((type = 'PATH' AND name LIKE '%/.%' ESCAPE '\\') AND NOT ((name LIKE '%/.cache/%' ESCAPE '\\' OR name LIKE '%/.config/%' ESCAPE '\\' OR name LIKE '%/.pyenv/%' ESCAPE '\\' OR name LIKE '%/.rustup/toolchains%' ESCAPE '\\')))"
],
"filename": "lnx_auditd_hidden_binary_execution.yml"
},
{
"title": "Audio Capture",
"id": "a7af2487-9c2f-42e4-9bb9-ff961f0561d5",
"description": "Detects attempts to record audio with arecord utility",
"author": "Pawel Mazur",
"tags": [
"attack.collection",
"attack.t1123"
],
"falsepositives": [
"Unknown"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND a0 = 'arecord' AND a1 = '-vv' AND a2 = '-fdat')"
],
"filename": "lnx_auditd_audio_capture.yml"
},
{
"title": "Systemd Service Creation",
"id": "1bac86ba-41aa-4f62-9d6b-405eac99b485",
"description": "Detects a creation of systemd services which could be used by adversaries to execute malicious code.",
"author": "Pawel Mazur",
"tags": [
"attack.persistence",
"attack.t1543.002"
],
"falsepositives": [
"Admin work like legit service installs."
],
"level": "medium",
"rule": [
"SELECT * FROM logs WHERE ((type = 'PATH' AND nametype = 'CREATE') AND ((name LIKE '/usr/lib/systemd/system/%' ESCAPE '\\' OR name LIKE '/etc/systemd/system/%' ESCAPE '\\') OR name LIKE '%/.config/systemd/user/%' ESCAPE '\\'))"
],
"filename": "lnx_auditd_systemd_service_creation.yml"
},
{
"title": "Password Policy Discovery",
"id": "ca94a6db-8106-4737-9ed2-3e3bb826af0a",
"description": "Detects password policy discovery commands",
"author": "Ömer Günal, oscd.community, Pawel Mazur",
"tags": [
"attack.discovery",
"attack.t1201"
],
"falsepositives": [
"Legitimate administration activities"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE ((type = 'PATH' AND name IN ('/etc/pam.d/common-password', '/etc/security/pwquality.conf', '/etc/pam.d/system-auth', '/etc/login.defs')) OR (type = 'EXECVE' AND a0 = 'chage' AND a1 IN ('--list', '-l')) OR (type = 'EXECVE' AND a0 = 'passwd' AND a1 IN ('-S', '--status')))"
],
"filename": "lnx_auditd_password_policy_discovery.yml"
},
{
"title": "Steganography Hide Zip Information in Picture File",
"id": "45810b50-7edc-42ca-813b-bdac02fb946b",
"description": "Detects appending of zip file to image",
"author": "Pawel Mazur",
"tags": [
"attack.defense-evasion",
"attack.t1027.003"
],
"falsepositives": [
"Unknown"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND a0 = 'cat' AND (a1 LIKE '%.jpg' ESCAPE '\\' OR a1 LIKE '%.png' ESCAPE '\\') AND a2 LIKE '%.zip' ESCAPE '\\')"
],
"filename": "lnx_auditd_hidden_zip_files_steganography.yml"
},
{
"title": "Steganography Unzip Hidden Information From Picture File",
"id": "edd595d7-7895-4fa7-acb3-85a18a8772ca",
"description": "Detects extracting of zip file from image file",
"author": "Pawel Mazur",
"tags": [
"attack.defense-evasion",
"attack.t1027.003"
],
"falsepositives": [
"Unknown"
],
"level": "low",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND a0 = 'unzip' AND (a1 LIKE '%.jpg' ESCAPE '\\' OR a1 LIKE '%.png' ESCAPE '\\'))"
],
"filename": "lnx_auditd_unzip_hidden_zip_files_steganography.yml"
},
{
"title": "Suspicious C2 Activities",
"id": "f7158a64-6204-4d6d-868a-6e6378b467e0",
"description": "Detects suspicious activities as declared by Florian Roth in its 'Best Practice Auditd Configuration'.\nThis includes the detection of the following commands; wget, curl, base64, nc, netcat, ncat, ssh, socat, wireshark, rawshark, rdesktop, nmap.\nThese commands match a few techniques from the tactics \"Command and Control\", including not exhaustively the following; Application Layer Protocol (T1071), Non-Application Layer Protocol (T1095), Data Encoding (T1132)\n",
"author": "Marie Euler",
"tags": [
"attack.command-and-control"
],
"falsepositives": [
"Admin or User activity"
],
"level": "medium",
"rule": [
"SELECT * FROM logs WHERE key LIKE 'susp\\_activity' ESCAPE '\\'"
],
"filename": "lnx_auditd_susp_c2_commands.yml"
},
{
"title": "Data Exfiltration with Wget",
"id": "cb39d16b-b3b6-4a7a-8222-1cf24b686ffc",
"description": "Detects attempts to post the file with the usage of wget utility.\nThe adversary can bypass the permission restriction with the misconfigured sudo permission for wget utility which could allow them to read files like /etc/shadow.\n",
"author": "Pawel Mazur",
"tags": [
"attack.exfiltration",
"attack.t1048.003"
],
"falsepositives": [
"Legitimate usage of wget utility to post a file"
],
"level": "medium",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND a0 = 'wget' AND a1 LIKE '--post-file=%' ESCAPE '\\')"
],
"filename": "lnx_auditd_data_exfil_wget.yml"
},
{
"title": "Binary Padding - Linux",
"id": "c52a914f-3d8b-4b2a-bb75-b3991e75f8ba",
"description": "Adversaries may use binary padding to add junk data and change the on-disk representation of malware.\nThis rule detect using dd and truncate to add a junk data to file.\n",
"author": "Igor Fits, oscd.community",
"tags": [
"attack.defense-evasion",
"attack.t1027.001"
],
"falsepositives": [
"Unknown"
],
"level": "high",
"rule": [
"SELECT * FROM logs WHERE (type = 'EXECVE' AND (( = 'truncate' AND = '-s') OR (( = 'dd' AND = 'if=') AND NOT (logs MATCH ('\"of=\"')))))"
],
"filename": "lnx_auditd_binary_padding.yml"
},
{
"title": "Loading of Kernel Module via Insmod",