{
  "title": "SystemHelpDesk Detection - Winshell (Trojan) Execution & Triage",
  "id": "afe834f0-768d-5d8e-8a8f-2284710a7005",
  "status": "production",
  "description": "Detects execution, defense evasion, and persistence behaviors associated with the Winshell malware family. Detects suspicious execution from temporary user directories with hidden window flags and background transfer utilities.",
  "references": [
    "https://malware-families-catalog.systemhelpdesk.com/families/winshell",
    "https://malware-families-catalog.systemhelpdesk.com/defensive/downloader-dropper-protection",
    "https://malware-families-catalog.systemhelpdesk.com/"
  ],
  "author": "Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP",
  "date": "2026-10-14",
  "modified": "2026-10-14",
  "tags": [
    "attack.trojan",
    "author.ricky-jordan",
    "source.systemhelpdesk-mfc",
    "attack.t1059_003",
    "attack.t1071_001",
    "attack.t1547_001"
  ],
  "logsource": {
    "category": "process_creation",
    "product": "windows"
  },
  "detection": {
    "selection_process": {
      "Image|endswith": [
        "\\cmd.exe",
        "\\powershell.exe",
        "\\cscript.exe",
        "\\wscript.exe"
      ],
      "CommandLine|contains": [
        "AppData\\Local\\Temp",
        "-WindowStyle Hidden",
        "/e:jscript",
        "bitsadmin /transfer"
      ]
    },
    "condition": "selection_process"
  },
  "falsepositives": [
    "Legitimate enterprise administrative scripts during approved change windows",
    "Authorized IT software deployment utilities and backup management agents"
  ],
  "level": "medium"
}