Query: rule covering Detects suspicious process command line that starts with a shell that executes something and finally gets piped into ano
Matching passage: Sigma rule: Detects suspicious process command line that starts with a shell that executes something and finally gets piped into ano. Logsource: linux / process_creation. Rule: title: Linux Shell Pipe to Shell id: 880973f3-9708-491c-a77b-2a35a1921158 status: test description: Detects suspicious process command line that starts with a shell that executes something and finally gets piped into another shell references: - Internal Research author: Florian Roth (Nextron Systems) date: 2022-03-14 modified: 2022-07-26 tags: - attack.stealth - attack.t1140 logsource: product: linux category: process_creation detection: selection: CommandLine|startswith: - 'sh -c ' - 'bash -c ' selection_exec: - CommandLine|contains: - '| bash ' - '| sh ' - '|bash ' - '|sh ' - CommandLine|endswith: - '| bash' - '| sh' - '|bash' - ' |sh' condition: all of selection* falsepositives: - Legitimate software that uses these patterns level: medium
Near-miss passage: Sigma rule: Detects changes to the Windows EventLog channel permission values. It focuses on changes to the Security Descriptor Defi. Logsource: windows / registry_set. Rule: title: Windows Event Log Access Tampering Via Registry id: ba226dcf-d390-4642-b9af-b534872f1156 status: experimental description: 'Detects changes to the Windows EventLog channel permission values. It focuses on changes to the Security Descriptor Definition Language (SDDL) string, as modifications to these values can restrict access to specific users or groups, potentially aiding in defense evasion by controlling who can view or modify a event log channel. Upon execution, the user shouldn''t be able to access the event log channel via the event viewer or via utilities such as "Get-EventLog" or "wevtutil". ' references: - https://www.atomicredteam.io/atomic-red-team/atomics/T1562.002#atomic-test-8---modify-event-log-channel-access-permissions-via-registry---powershell - https://www.youtube.com/watch?v=uSYvHUVU8xY - https://learn.microsoft.com/en-us/windows/win32/secauthz/security-descriptor-definition-language author: X__Junior date: 2025-01-16 modified: 2025-08-16 tags: - attack.privilege-escalation - attack.persistence - attack.defense-impairment - attack.t1547.001 - attack.t1112 logsource: category: registry_set product: windows detection: selection_key_1: TargetObject|contains: \SYSTEM\CurrentControlSet\Services\EventLog\ TargetObject|endswith: \CustomSD selection_key_2: TargetObject|contains: - \Policies\Microsoft\Windows\EventLog\ - \Microsoft\Windows\CurrentVersion\WINEVT\Channels TargetObject|endswith: \ChannelAccess selection_details: - Details|contains: D:(D; - Details|contains|all: - D:( - )(D; filter_main_trustedinstaller: Image: C:\Windows\servicing\TrustedInstaller.exe filter_main_tiworker: Image|startswith: C:\Windows\WinSxS\ Image|endswith: \TiWorker.exe filter_optional_empty: Image: '' filter_optional_null: Image: null condition: 1 of selection_key_* and selection_details and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Administrative activity, still unlikely level: high