sigmahighHunting

Suspicious Shim Database Patching Activity

Detects installation of new shim databases that try to patch sections of known processes for potential process injection or persistence.

MITRE ATT&CK

T1546.011

privilege-escalationpersistence

Detection Query

selection:
  TargetObject|contains: \SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Custom\
  TargetObject|endswith:
    - \csrss.exe
    - \dllhost.exe
    - \explorer.exe
    - \RuntimeBroker.exe
    - \services.exe
    - \sihost.exe
    - \svchost.exe
    - \taskhostw.exe
    - \winlogon.exe
    - \WmiPrvSe.exe
condition: selection

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2023-08-01

Data Sources

windowsRegistry Set Events

Platforms

windows

References

Tags

attack.privilege-escalationattack.persistenceattack.t1546.011

Raw Content

title: Suspicious Shim Database Patching Activity
id: bf344fea-d947-4ef4-9192-34d008315d3a
status: test
description: Detects installation of new shim databases that try to patch sections of known processes for potential process injection or persistence.
references:
    - https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/pillowmint-fin7s-monkey-thief/
    - https://www.fireeye.com/blog/threat-research/2017/05/fin7-shim-databases-persistence.html
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-08-01
modified: 2023-12-06
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.t1546.011
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|contains: '\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Custom\'
        TargetObject|endswith:
            # Note: add other application to increase coverage
            - '\csrss.exe'
            - '\dllhost.exe'
            - '\explorer.exe'
            - '\RuntimeBroker.exe'
            - '\services.exe'
            - '\sihost.exe'
            - '\svchost.exe'
            - '\taskhostw.exe'
            - '\winlogon.exe'
            - '\WmiPrvSe.exe'
    condition: selection
falsepositives:
    - Unknown
level: high