Activity timeline
T1055.004 first appeared in tracked threats on and was most recently reported on . The busiest month was 2026-08 with 6 reports, and 15 of the 15 threats were reported in the twelve months to 2026-09.
How adversaries use it
T1055.004 Asynchronous Procedure Call is catalogued by MITRE ATT&CK under the Privilege Escalation and Stealth (formerly Defense Evasion) tactics in the Enterprise matrix, as a sub-technique of T1055 Process Injection. Threadlinqs maps 15 of 2623 tracked threats (0.6%) to it; by severity that is 11 high, 4 medium.
Threats that use T1055.004 most often also use T1027 Obfuscated Files or Information (12 threats), T1547.001 Registry Run Keys / Startup Folder (11 threats), T1059.001 PowerShell (10 threats), T1071.001 Web Protocols (10 threats), T1204.002 Malicious File (10 threats). These are the techniques an intrusion set tends to chain with it, so they are the natural next places to look when it is observed.
2 tracked threat actors appear in the threats that use T1055.004; the most frequent are UAT-11795 (2), LenAI (1).
Mitigations
MITRE ATT&CK lists 1 mitigation for T1055.004.
Data sources
Telemetry that can reveal T1055.004, per MITRE ATT&CK.
- Process — OS API Execution, Process Access, Process Modification
Threat actors using it
Tracked threats
15 tracked threats use T1055.004.
- CLOSEDQUORUM: First Reported Autonomous AI-Driven C2 Implant Using LLM Plurality Voting (Windows Infostealer)medium
- ClosedQuorum: Go-Based Windows Implant Delegates Post-Compromise Decisions to a Four-Model LLM Voting Panelmedium
- Cisco Talos Open-Sources CAIRN to Hunt AI-Integrated Malware; Discloses CLOSEDQUORUM, First Documented…medium
- BloodAlchemy RAT Traced to Deed RAT/ShadowPad Lineage via VPN Account Compromise and DLL Side-Loadinghigh
- Commodity Infostealers Hijacking Claude Login Sessions to Drain Account Usagemedium
- FTP Server Banners Abused as Dead-Drop Resolvers to Deliver E4del and PINHOLE Windows RATshigh
- New E4del and PINHOLE RATs Abuse FTP Server Banners as Dead-Drop Resolvershigh
- Chinese-speaking threat group UAT-10147 uses agentic AI to automate exploitation of internet-facing web…high
- Crimeware-as-a-Service: Inside the Malware Crypting Services Market and Its Threat Actorshigh
- Aeternum Loader Uses Polygon Blockchain Smart Contracts for Resilient C2, Deploys XWorm and XMRighigh
- Starland RAT Campaign (UAT-11795) — Trojanized WebEx, Zoom, MobaXterm, DBeaver & FACEIT Installers Deliver…high
- UAT-11795 (Russian) Trojanizes WebEx, Zoom, MobaXterm, DBeaver, FaceIT Installers to Deploy Starland RAT and…high
- StealC Infostealer and Amadey Loader Malware-as-a-Service Cybercrime Ecosystem (Operation Endgame Disruption)high
- Operation GriefLure — China-Nexus APT Spear-Phishing Targeting Viettel (Vietnam Military Telecom) and St.…high
- VOID#GEIST Multi-RAT Campaign — Early Bird APC Injection Delivering XWorm, AsyncRAT, and Xeno RAT via Python…high
Detection coverage
Threadlinqs maintains 23 detection rules mapped to T1055.004 (SPL 9, KQL 10, Sigma 4). Rule content is available to Blue tier accounts and above; this page shows counts only.
Parent technique
T1055 Process Injection — 269 tracked threats at the technique level.