Unsigned BITS Service Client Process

Identifies an unsigned Windows Background Intelligent Transfer Service (BITS) client process. Attackers may abuse BITS functionality to download or upload data using the BITS service.

Rule type: eql
Rule indices:

• logs-endpoint.events.library-*

Rule Severity: low
Risk Score: 21
Runs every: 60m
Searches indices from: now-119m
Maximum alerts per execution: ?
References:

• https://web.archive.org/web/20230531215706/https://blog.menasec.net/2021/05/hunting-for-suspicious-usage-of.html
• https://www.elastic.co/blog/hunting-for-persistence-using-elastic-security-part-2

Tags:

• Domain: Endpoint
• OS: Windows
• Use Case: Threat Detection
• Tactic: Defense Evasion
• Rule Type: BBR
• Data Source: Elastic Defend

Version: ?
Rule authors:

• Elastic

Rule license: Elastic License v2

library where dll.name : "Bitsproxy.dll" and process.executable != null and
not process.code_signature.trusted == true and
not process.code_signature.status : ("errorExpired", "errorCode_endpoint*")

Framework: MITRE ATT&CK

• Tactic:

  • Name: Defense Evasion
  • Id: TA0005
  • Reference URL: https://attack.mitre.org/tactics/TA0005/

• Technique:

  • Name: Masquerading
  • Id: T1036
  • Reference URL: https://attack.mitre.org/techniques/T1036/

• Sub Technique:

  • Name: Invalid Code Signature
  • Id: T1036.001
  • Reference URL: https://attack.mitre.org/techniques/T1036/001/

• Technique:

  • Name: BITS Jobs
  • Id: T1197
  • Reference URL: https://attack.mitre.org/techniques/T1197/