Temporary File Executed from Public Folder (Windows Event Log)

id: '28106.51148'
title: Temporary File Executed from Public Folder
description: 'The BlackBerry Threat Research and Intelligence Team has detailed several
  behaviors of threat actors using the RomCom remote access trojan. One indication
  of unusual activity is the placement of binaries in Temp directories with the extension
  .tmp which are launched by processes stored in the Public folder. This use case
  detects processes executing from temporary directories with parent processes located
  in public folders. -- Threat Actor Association: UNC5812'
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_winevent` (TERM(EventCode=4688) OR
  "<EventID>4688<" OR Type=Process) "\\AppData\\Local\\Temp\\" ".tmp" "\\Users\\Public"
  ".exe" | regex parent_process_path="(?i)\x5cUsers\x5cPublic\x5c\.exe"| regex process_path="(?i)\x5cAppData\x5cLocal\x5cTemp\x5c.+\.tmp"
  | table _time, host, user, process, process_*, parent_process_* | bin span=1s |
  stats values(*) as * by _time, host '
techniques:
- command-and-control:ingress tool transfer
- lateral-movement:taint shared content
technique_id: 
- T1105
- T1080
data_category:
- Windows event logs
references:
- https://www.virustotal.com/gui/file/6d3ab9e729bb03ae8ae3fcd824474c5052a165de6cb4c27334969a542c7b261d/behavior
- https://blogs.blackberry.com/en/2022/10/unattributed-romcom-threat-actor-spoofing-popular-apps-now-hits-ukrainian-militaries