Query: rule covering Detects chmod targeting files in sensitive directory paths on Linux systems. Attackers may use chmod to change permissio
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 DCShadow via create new SPN. Logsource: windows / security. Rule: title: Possible DC Shadow Attack id: 32e19d25-4aed-4860-a55a-be99cb0bf7ed related: - id: 611eab06-a145-4dfa-a295-3ccc5c20f59a type: derived status: test description: Detects DCShadow via create new SPN references: - https://twitter.com/gentilkiwi/status/1003236624925413376 - https://gist.github.com/gentilkiwi/dcc132457408cf11ad2061340dcb53c2 - https://web.archive.org/web/20180203014709/https://blog.alsid.eu/dcshadow-explained-4510f52fc19d?gi=c426ac876c48 author: Ilyas Ochkov, oscd.community, Chakib Gzenayi (@Chak092), Hosni Mribah date: 2019-10-25 modified: 2022-10-17 tags: - attack.credential-access - attack.defense-impairment - attack.t1207 logsource: product: windows service: security definition: The "Audit Directory Service Changes" logging policy must be configured in order to receive events. Audit events are generated only for objects with configured system access control lists (SACLs). Audit events are generated only for objects with configured system access control lists (SACLs) and only when accessed in a manner that matches their SACL settings. This policy covers the following events ids - 5136, 5137, 5138, 5139, 5141. Note that the default policy does not cover User objects. For that a custom AuditRule need to be setup (See https://github.com/OTRF/Set-AuditRule) detection: selection1: EventID: 4742 ServicePrincipalNames|contains: GC/ selection2: EventID: 5136 AttributeLDAPDisplayName: servicePrincipalName AttributeValue|startswith: GC/ condition: 1 of selection* falsepositives: - Valid on domain controllers; exclude known DCs level: medium