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Threat actorIranTracked since 2026-05

UNC1549

Also known as:Nimbus ManticoreSmoke SandstormTA455Subtle SnailIranian Dream JobIRGC-affiliatedYellow Dev 21

As of 2026-07-14, UNC1549 is a Iran-nexus threat actor tracked by Threadlinqs Intelligence across 6 threats spanning campaign, apt, malware. Also known as Nimbus Manticore, Smoke Sandstorm, TA455, Subtle Snail. ATT&CK coverage spans 92 techniques across 14 tactics in 6 of 6 tracked threats. Most-observed techniques: T1027 (Obfuscated Files or Information), T1071.001 (Web Protocols), T1105 (Ingress Tool Transfer).

Tracked threats
65 high · 1 medium
First seen
2026-05-22
Last seen
2026-07-14
ATT&CK techniques
92across 6 of 6 threats
Related CVEs
1Referenced by its activity
Attribution
IranNation or origin
Nation: Iran · 6 tracked threat(s) · Categories: CAMPAIGN, APT, MALWARE

Activity timeline

UNC1549 appears in 6 tracked threats between and ; the busiest month was 2026-06 with 3 reports.

ATT&CK techniques observed

92 techniques observed across 6 of 6 tracked threats · Stealth (formerly Defense Evasion) (16), Resource Development (13), Command and Control (11), Discovery (9), Initial Access (9), Execution (7)
  • T1027 Obfuscated Files or Information — Stealth (formerly Defense Evasion)observed in 5 of 6 tracked threats
  • T1071.001 Web Protocols — Command and Controlobserved in 5 of 6 tracked threats
  • T1105 Ingress Tool Transfer — Command and Controlobserved in 5 of 6 tracked threats
  • T1140 Deobfuscate/Decode Files or Information — Stealth (formerly Defense Evasion)observed in 5 of 6 tracked threats
  • T1574.001 DLL — Stealth (formerly Defense Evasion)observed in 5 of 6 tracked threats
  • T1041 Exfiltration Over C2 Channel — Exfiltrationobserved in 4 of 6 tracked threats
  • T1053.005 Scheduled Task — Persistenceobserved in 4 of 6 tracked threats
  • T1082 System Information Discovery — Discoveryobserved in 4 of 6 tracked threats
  • T1204.002 User Execution: Malicious File — Executionobserved in 4 of 6 tracked threats
  • T1566.002 Spearphishing Link — Initial Accessobserved in 4 of 6 tracked threats
  • T1583.006 Acquire Infrastructure: Web Services — Resource Developmentobserved in 4 of 6 tracked threats
  • T1005 Data from Local System — Collectionobserved in 3 of 6 tracked threats
  • T1036.005 Match Legitimate Resource Name or Location — Stealth (formerly Defense Evasion)observed in 3 of 6 tracked threats
  • T1057 Process Discovery — Discoveryobserved in 3 of 6 tracked threats
  • T1090 Proxy — Command and Controlobserved in 3 of 6 tracked threats

Tracked threats

Related CVEs

1 CVE referenced by tracked UNC1549 activity