Query: Sigma rule for Detects attackers using tooling with bad opsec defaults. E.g. spawning a sacrificial process to inject a capability into
Matching passage: Sigma rule: Detects attackers using tooling with bad opsec defaults. E.g. spawning a sacrificial process to inject a capability into. Logsource: windows / process_creation. Rule: title: Bad Opsec Defaults Sacrificial Processes With Improper Arguments id: a7c3d773-caef-227e-a7e7-c2f13c622329 related: - id: f5647edc-a7bf-4737-ab50-ef8c60dc3add type: obsolete status: test description: 'Detects attackers using tooling with bad opsec defaults. E.g. spawning a sacrificial process to inject a capability into the process without taking into account how the process is normally run. One trivial example of this is using rundll32.exe without arguments as a sacrificial process (default in CS, now highlighted by c2lint), running WerFault without arguments (Kraken - credit am0nsec), and other examples. ' references: - https://blog.malwarebytes.com/malwarebytes-news/2020/10/kraken-attack-abuses-wer-service/ - https://www.cobaltstrike.com/help-opsec - https://twitter.com/CyberRaiju/status/1251492025678983169 - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/regsvr32 - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/rundll32 - https://learn.microsoft.com/en-us/dotnet/framework/tools/regasm-exe-assembly-registration-tool - https://learn.microsoft.com/en-us/dotnet/framework/tools/regsvcs-exe-net-services-installation-tool author: Oleg Kolesnikov @securonix invrep_de, oscd.community, Florian Roth (Nextron Systems), Christian Burkard (Nextron Systems) date: 2020-10-23 modified: 2024-08-15 tags: - attack.stealth - attack.t1218.011 logsource: category: process_creation product: windows detection: selection_werfault: Image|endswith: \WerFault.exe CommandLine|endswith: WerFault.exe selection_rundll32: Image|endswith: \rundll32.exe CommandLine|endswith: rundll32.exe selection_regsvcs: Image|endswith: \regsvcs.exe CommandLine|endswith: regsvcs.exe selection_regasm: Image|endswith: \regasm.exe CommandLine|endswith: regasm.exe selection_regsvr32: Image|endswith: \regsvr32.exe CommandLine|endswith: regsvr32.exe filter_optional_edge_update: ParentImage|contains: \AppData\Local\Microsoft\EdgeUpdate\Install\{ Image|endswith: \rundll32.exe CommandLine|endswith: rundll32.exe filter_optional_chromium_installer: ParentImage|contains: - \AppData\Local\BraveSoftware\Brave-Browser\Application\ - \AppData\Local\Google\Chrome\Application\ ParentImage|endswith: \Installer\setup.exe ParentCommandLine|contains: '--uninstall ' Image|endswith: \rundll32.exe CommandLine|endswith: rundll32.exe condition: 1 of selection_* and not 1 of filter_optional_* falsepositives: - Unlikely level: high
Near-miss passage: Sigma rule: Detects Cobalt Strike module/commands accidentally entered in CMD shell. Logsource: windows / process_creation. Rule: title: Operator Bloopers Cobalt Strike Modules id: 4f154fb6-27d1-4813-a759-78b93e0b9c48 related: - id: 647c7b9e-d784-4fda-b9a0-45c565a7b729 type: similar status: test description: Detects Cobalt Strike module/commands accidentally entered in CMD shell references: - https://hstechdocs.helpsystems.com/manuals/cobaltstrike/current/userguide/content/cobalt-4-5-user-guide.pdf - https://thedfirreport.com/2021/10/04/bazarloader-and-the-conti-leaks/ - https://thedfirreport.com/2022/06/16/sans-ransomware-summit-2022-can-you-detect-this/ author: _pete_0, TheDFIRReport date: 2022-05-06 modified: 2023-01-30 tags: - attack.execution - attack.t1059.003 logsource: category: process_creation product: windows detection: selection_img: - OriginalFileName: Cmd.Exe - Image|endswith: \cmd.exe selection_cli: CommandLine|contains: - Invoke-UserHunter - Invoke-ShareFinder - Invoke-Kerberoast - Invoke-SMBAutoBrute - Invoke-Nightmare - zerologon - av_query condition: all of selection_* falsepositives: - Unknown level: high