New Custom Shim Database Created

Title: New Custom Shim Database Created
Status: test
Description:Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by application shims. The Microsoft Windows Application Compatibility Infrastructure/Framework (Application Shim) was created to allow for backward compatibility of software as the operating system codebase changes over time.
References:
  -https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1546.011/T1546.011.md#atomic-test-2---new-shim-database-files-created-in-the-default-shim-database-directory
  -https://www.mandiant.com/resources/blog/fin7-shim-databases-persistence
  -https://liberty-shell.com/sec/2020/02/25/shim-persistence/
  -https://andreafortuna.org/2018/11/12/process-injection-and-persistence-using-application-shimming/
Author: frack113, Nasreddine Bencherchali (Nextron Systems)
Date: 2021-12-29
modified:2023-12-06
Tags:

• -'attack.privilege-escalation'
• -'attack.persistence'
• -'attack.t1547.009'

Logsource:

• product: windows
• category: file_event

Detection:
  selection:
    TargetFilename|contains:
      -':\Windows\apppatch\Custom\'
      -':\Windows\apppatch\CustomSDB\'

  condition:selection
Falsepositives:
  -Legitimate custom SHIM installations will also trigger this rule
Level: medium