Query: detect Detects chmod targeting files in sensitive directory paths on Linux systems. Attackers may use chmod to change permissio in logs
Matching passage: Sigma rule: Detects chmod targeting files in sensitive directory paths on Linux systems. Attackers may use chmod to change permissio. Logsource: linux / process_creation. Rule: title: Chmod Targeting Sensitive Directories id: 6419afd1-3742-47a5-a7e6-b50386cd15f8 status: test description: 'Detects chmod targeting files in sensitive directory paths on Linux systems. Attackers may use chmod to change permissions of files in these directories to maintain persistence, escalate privileges, or disrupt system operations. ' references: - https://www.intezer.com/blog/malware-analysis/new-backdoor-sysjoker/ - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1222.002/T1222.002.md author: Christopher Peacock @SecurePeacock, SCYTHE @scythe_io date: 2022-06-03 modified: 2026-03-18 tags: - attack.defense-impairment - attack.t1222.002 logsource: product: linux category: process_creation detection: selection: Image|endswith: /chmod CommandLine|contains: - /tmp/ - /.Library/ - /etc/ - /opt/ filter_main_update_shells: CommandLine|contains: chmod --reference=/etc/shells ParentCommandLine|endswith: /update-shells filter_main_postinst: CommandLine|contains: /etc/ ParentCommandLine|contains|all: - /var/lib/dpkg/info/ - .postinst configure filter_main_apt_key: CommandLine|startswith: chmod 700 /tmp/apt-key-gpghome. filter_main_mkinitramfs: CommandLine|startswith: chmod 755 /var/tmp/mkinitramfs filter_main_landscape: CommandLine: chmod 0775 /etc/landscape/ filter_main_ubuntu_apparmor: CommandLine: chmod 644 /etc/apparmor.d/tunables/home.d/ubuntu condition: selection and not 1 of filter_main_* falsepositives: - Some false positives are to be expected. Apply additional filters as needed before pushing to production. level: medium
Near-miss passage: Sigma rule: Detects process access requests to the LSASS process with specific call trace calls and access masks. This behaviour is. Logsource: windows / process_access. Rule: title: Potential Credential Dumping Activity Via LSASS id: 5ef9853e-4d0e-4a70-846f-a9ca37d876da status: test description: 'Detects process access requests to the LSASS process with specific call trace calls and access masks. This behaviour is expressed by many credential dumping tools such as Mimikatz, NanoDump, Invoke-Mimikatz, Procdump and even the Taskmgr dumping feature. ' references: - https://web.archive.org/web/20230329170326/https://blog.menasec.net/2019/02/threat-hunting-21-procdump-or-taskmgr.html - https://web.archive.org/web/20230208123920/https://cyberwardog.blogspot.com/2017/03/chronicles-of-threat-hunter-hunting-for_22.html - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1003.001/T1003.001.md - https://research.splunk.com/endpoint/windows_possible_credential_dumping/ author: Samir Bousseaden, Michael Haag date: 2019-04-03 modified: 2026-06-29 tags: - attack.credential-access - attack.t1003.001 - attack.s0002 logsource: category: process_access product: windows detection: selection: TargetImage|endswith: \lsass.exe GrantedAccess|contains: - '0x1038' - '0x1438' - '0x143a' - '0x1fffff' CallTrace|contains: - dbgcore.dll - dbghelp.dll - kernel32.dll - kernelbase.dll - ntdll.dll filter_main_system_user: SourceUser|contains: - AUTHORI - AUTORI filter_optional_thor: CallTrace|contains|all: - :\Windows\Temp\asgard2-agent\ - \thor\thor64.exe+ - '|UNKNOWN(' GrantedAccess: '0x103800' filter_optional_sysmon: SourceImage|endswith: - :\Windows\Sysmon64.exe - :\Windows\Sysmon64a.exe condition: selection and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Unknown level: medium