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Threat actorTracked since 2026-09

StepFun

As of 2026-09-09, StepFun is a threat actor tracked by Threadlinqs Intelligence across 2 threats spanning threat intel, apt. ATT&CK coverage spans 18 techniques across 10 tactics in 2 of 2 tracked threats. Most-observed techniques: AML.T0008 (Acquire Infrastructure), AML.T0024.002 (Exfiltration via AI Inference API: Extract AI Model), AML.T0040 (AI Model Inference API Access).

Tracked threats
21 critical · 1 high
First seen
2026-09-08
Last seen
2026-09-09
ATT&CK techniques
18across 2 of 2 threats
Related CVEs
0None referenced
2 tracked threat(s) · Categories: THREAT_INTEL, APT

Activity timeline

StepFun appears in 2 tracked threats between and .

ATT&CK techniques observed

18 techniques observed across 2 of 2 tracked threats · Stealth (formerly Defense Evasion) (4), Exfiltration (3), Resource Development (3), Command and Control (2), Impact (2), Initial Access (2)
  • AML.T0008 Acquire Infrastructure — Resource Developmentobserved in 2 of 2 tracked threats
  • AML.T0024.002 Exfiltration via AI Inference API: Extract AI Model — Exfiltrationobserved in 2 of 2 tracked threats
  • AML.T0040 AI Model Inference API Access — AI Model Access (ATLAS)observed in 2 of 2 tracked threats
  • AML.T0042 Verify Attack — AI Attack Staging (ATLAS)observed in 2 of 2 tracked threats
  • AML.T0051 LLM Prompt Injection — Executionobserved in 2 of 2 tracked threats
  • AML.T0054 LLM Jailbreak — Stealth (formerly Defense Evasion)observed in 2 of 2 tracked threats
  • T1048 Exfiltration Over Alternative Protocol — Exfiltrationobserved in 2 of 2 tracked threats
  • T1078 Valid Accounts — Initial Accessobserved in 2 of 2 tracked threats
  • T1583.003 Virtual Private Server — Resource Developmentobserved in 2 of 2 tracked threats
  • AML.T0024 Exfiltration via AI Inference API — Exfiltrationobserved in 1 of 2 tracked threats
  • AML.T0048 External Harms — Impactobserved in 1 of 2 tracked threats
  • AML.T0048.004 External Harms: AI Intellectual Property Theft — Impactobserved in 1 of 2 tracked threats
  • T1027 Obfuscated Files or Information — Stealth (formerly Defense Evasion)observed in 1 of 2 tracked threats
  • T1036 Masquerading — Stealth (formerly Defense Evasion)observed in 1 of 2 tracked threats
  • T1090.003 Multi-hop Proxy — Command and Controlobserved in 1 of 2 tracked threats

Tracked threats