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Threat actorChinaTracked since 2026-02

Silver Fox APT

Also known as:SilverFoxSilver FoxVoid ArachneValleyRAT operatorsWinos 4.0 operatorsValleyRAT GroupWinos4.0 Operators

As of 2026-05-30, Silver Fox APT is a China-nexus threat actor tracked by Threadlinqs Intelligence across 3 threats spanning malware, apt. Also known as SilverFox, Silver Fox, Void Arachne, ValleyRAT operators. ATT&CK coverage spans 60 techniques across 12 tactics in 3 of 3 tracked threats. Most-observed techniques: T1027 (Obfuscated Files or Information), T1055 (Process Injection), T1082 (System Information Discovery).

Tracked threats
33 high
First seen
2026-02-24
Last seen
2026-05-20
ATT&CK techniques
60across 3 of 3 threats
Related CVEs
0None referenced
Attribution
ChinaNation or origin
Nation: China · 3 tracked threat(s) · Categories: MALWARE, APT

Activity timeline

Silver Fox APT appears in 3 tracked threats between and ; the busiest month was 2026-02 with 1 report.

ATT&CK techniques observed

60 techniques observed across 3 of 3 tracked threats · Stealth (formerly Defense Evasion) (14), Execution (10), Collection (7), Command and Control (7), Discovery (5), Initial Access (4)
  • T1027 Obfuscated Files or Information — Stealth (formerly Defense Evasion)observed in 3 of 3 tracked threats
  • T1055 Process Injection — Stealth (formerly Defense Evasion)observed in 3 of 3 tracked threats
  • T1082 System Information Discovery — Discoveryobserved in 3 of 3 tracked threats
  • T1105 Ingress Tool Transfer — Command and Controlobserved in 3 of 3 tracked threats
  • T1140 Deobfuscate/Decode Files or Information — Stealth (formerly Defense Evasion)observed in 3 of 3 tracked threats
  • T1036.005 Match Legitimate Resource Name or Location — Stealth (formerly Defense Evasion)observed in 2 of 3 tracked threats
  • T1041 Exfiltration Over C2 Channel — Exfiltrationobserved in 2 of 3 tracked threats
  • T1053.005 Scheduled Task — Persistenceobserved in 2 of 3 tracked threats
  • T1056.001 Keylogging — Collectionobserved in 2 of 3 tracked threats
  • T1059.001 PowerShell — Executionobserved in 2 of 3 tracked threats
  • T1115 Clipboard Data — Collectionobserved in 2 of 3 tracked threats
  • T1189 Drive-by Compromise — Initial Accessobserved in 2 of 3 tracked threats
  • T1204.002 User Execution: Malicious File — Executionobserved in 2 of 3 tracked threats
  • T1218.011 Rundll32 — Stealth (formerly Defense Evasion)observed in 2 of 3 tracked threats
  • T1497.001 Virtualization/Sandbox Evasion: System Checks — Stealth (formerly Defense Evasion)observed in 2 of 3 tracked threats

Tracked threats