Duo Tech
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Detects interactive sign-in by an Entra Connect/AAD Connect sync service account (Sync_ prefix), which should only authenticate non-interactively. CISA's red team compromised a hybrid sync account to pivot from on-prem AD into cloud resources.
Detects network connections, DNS resolutions, or TLS SNI values matching known TWINLOOT command-and-control infrastructure, including the attacker-registered domains sharepointx.th2ch.com and lpi-web.com and the failover IP 193.24.211.221. TWINLOOT is a modular Python implant that hides its C2 inside trusted Microsoft cloud services (Graph API, SharePoint Online, Teams TURN relay) while also relying on dedicated attacker-controlled infrastructure for direct TLS/WebSocket tunneling and failover.
Detects Linux persistence and removal activity by the botking implant, systemd user-service creation with the 'System Config User Service' description marker, secondary symlink persistence, or systemctl --user enable/disable for install/removal.
Detects System-process (PID 4) registry writes or deletions targeting Windows Defender tamper-protection values or Run/RunOnce persistence keys, indicating use of the BTR.sys kernel registry-write primitive to disable protections or establish persistence.
Detects msedge.exe launched headless (--headless / --headless=new) with CDP remote debugging enabled (--remote-debugging-port=), a temp profile directory matching the launcher-edge- naming pattern, and window flags positioning it off-screen (--window-position=-32000,-32000, --window-size=1,1). This combination matches the TWINLOOT implant's technique of spawning a headless Edge instance with a Chrome DevTools Protocol connection, using the browser's authenticated same-origin session to proxy Microsoft Graph API C2 traffic so it blends in with legitimate browser network activity while remaining invisible on-screen. Excludes known browser-automation/CI framework parent processes and the --enable-automation flag to reduce false positives.
references:
- https://detections.ai/inspirations/01a01ade-da64-7718-8281-426118171583
- https://detections.ai/inspirations/01a01ade-d9a6-742d-8e2f-f60b5efce416
- https://detections.ai/inspirations/01a01ade-da04-700d-ba14-769eef28e475
- https://github.com/ontinue-research/threat-intel-iocs/blob/main/Public/2026-07-27-TWINLOOT-IOCs.md
- https://www.ontinue.com/resource/python-implant-hiding-its-entire-c2-inside-microsoft-365-azure/
references:
- https://detections.ai/inspirations/01a01ade-da64-7718-8281-426118171583
- https://detections.ai/inspirations/01a01ade-d9a6-742d-8e2f-f60b5efce416
- https://detections.ai/inspirations/01a01ade-da04-700d-ba14-769eef28e475
- https://github.com/ontinue-research/threat-intel-iocs/blob/main/Public/2026-07-27-TWINLOOT-IOCs.md
- https://www.ontinue.com/resource/python-implant-hiding-its-entire-c2-inside-microsoft-365-azure/
Detects ClickFix-style initial access where a Run-dialog-spawned interpreter (cmd.exe, powershell.exe, mshta.exe, cscript.exe) executes an encoded or obfuscated command line, consistent with clipboard-paste delivery of C2Looper.
Detects access to SQL developer tool configuration files (connections.json, product-preferences.xml) followed by a decryption utility, used by CISA's red team to recover cleartext database credentials from a targeted workstation.
Detects unauthorized, non-browser processes accessing sensitive Chromium-based browser credential files (e.g., 'Local State', 'Login Data', 'Cookies') followed by suspicious outbound network connections. This pattern is characteristic of credential-stealing malware (infostealers) like Amatera, Lumma, and Remus.
This rule monitors for incoming emails containing suspicious attachments (such as .htm, .xhtml, .svg, or QR codes) associated with common business-related subject lines or file names (e.g., 'contract', 'agreement', 'edocs'). It specifically identifies emails originating from 'amazonses.com' that do not match expected trusted domains like DocuSign or Workday, indicating a potential credential harvesting or phishing attempt.
Flags direct registry staging of a Boot Bus Extender service (SERVICE_SYSTEM_START) whose Args value contains ':changelist', bypassing the Service Control Manager, where the driver image lies outside the Defender platform folder or uses a randomized 8-character filename — the SCM-bypass pattern used to stage BTR.sys for boot-time or immediate execution.
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