phantinuss
49 lines
2.1 KiB
YAML
49 lines
2.1 KiB
YAML
title: Bad Opsec Defaults Sacrificial Processes With Improper Arguments
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id: a7c3d773-caef-227e-a7e7-c2f13c622329
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status: experimental
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related:
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- id: f5647edc-a7bf-4737-ab50-ef8c60dc3add
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type: obsoletes
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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.'
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author: Oleg Kolesnikov @securonix invrep_de, oscd.community, Florian Roth, Christian Burkard
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date: 2020/10/23
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modified: 2021/09/01
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references:
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- https://blog.malwarebytes.com/malwarebytes-news/2020/10/kraken-attack-abuses-wer-service/
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- https://www.cobaltstrike.com/help-opsec
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- https://twitter.com/CyberRaiju/status/1251492025678983169
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- https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/regsvr32
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- https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/rundll32
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- https://docs.microsoft.com/en-us/dotnet/framework/tools/regasm-exe-assembly-registration-tool
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- https://docs.microsoft.com/en-us/dotnet/framework/tools/regsvcs-exe-net-services-installation-tool#feedback
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tags:
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- attack.defense_evasion
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- attack.t1085 # an old one
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- attack.t1218.011
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logsource:
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category: process_creation
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product: windows
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detection:
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selection1:
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Image|endswith: '\WerFault.exe'
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CommandLine|endswith: '\WerFault.exe'
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selection2:
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Image|endswith: '\rundll32.exe'
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CommandLine|endswith: '\rundll32.exe'
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selection3:
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Image|endswith: '\regsvcs.exe'
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CommandLine|endswith: '\regsvcs.exe'
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selection4:
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Image|endswith: '\regasm.exe'
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CommandLine|endswith: '\regasm.exe'
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selection5:
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Image|endswith: '\regsvr32.exe'
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CommandLine|endswith: '\regsvr32.exe'
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condition: 1 of selection*
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fields:
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- ParentImage
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- ParentCommandLine
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falsepositives:
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- Unlikely
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level: high
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