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Ingress Transfer via Windows BITS

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Ingress Transfer via Windows BITS

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Identifies downloads of executable and archive files via the Windows Background Intelligent Transfer Service (BITS). Adversaries could leverage Windows BITS transfer jobs to download remote payloads.

Rule type: eql

Rule indices:

logs-endpoint.events.*

Severity: low

Risk score: 21

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://attack.mitre.org/techniques/T1197/

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Defense Evasion
Tactic: Command and Control
Data Source: Elastic Defend

Version: 5

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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file where host.os.type == "windows" and event.action == "rename" and
  process.name : "svchost.exe" and file.Ext.original.name : "BIT*.tmp" and
  (file.extension : ("exe", "zip", "rar", "bat", "dll", "ps1", "vbs", "wsh", "js", "vbe", "pif", "scr", "cmd", "cpl") or
   file.Ext.header_bytes : "4d5a*") and

  /* noisy paths, for hunting purposes you can use the same query without the following exclusions */
  not file.path : ("?:\\Program Files\\*", "?:\\Program Files (x86)\\*", "?:\\Windows\\*", "?:\\ProgramData\\*\\*") and

  /* lot of third party SW use BITS to download executables with a long file name */
  not length(file.name) > 30 and
  not file.path : (
        "?:\\Users\\*\\AppData\\Local\\Temp*\\wct*.tmp",
        "?:\\Users\\*\\AppData\\Local\\Adobe\\ARM\\*\\RdrServicesUpdater*.exe",
        "?:\\Users\\*\\AppData\\Local\\Docker Desktop Installer\\update-*.exe"
  )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Command and Control
- ID: TA0011
- Reference URL: https://attack.mitre.org/tactics/TA0011/
Technique:
- Name: Ingress Tool Transfer
- ID: T1105
- Reference URL: https://attack.mitre.org/techniques/T1105/
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: BITS Jobs
- ID: T1197
- Reference URL: https://attack.mitre.org/techniques/T1197/

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