SYMBOLCOMMON_NAMEaka. SYNONYMS

UNC5337  (Back to overview)


UNC5337 is a suspected China-nexus espionage actor that compromised Ivanti Connect Secure VPN appliances as early as Jan. 2024. UNC5337 is suspected to exploit CVE-2023-46805 (authentication bypass) and CVE-2024-21887 (command injection) for infecting Ivanti Connect Secure appliances. UNC5337 leveraged multiple custom malware families including the SPAWNSNAIL passive backdoor, SPAWNMOLE tunneler, SPAWNANT installer, and SPAWNSLOTH log tampering utility. Mandiant suspects with medium confidence that UNC5337 is UNC5221.

Associated Families

There are currently no families associated with this actor.

References
2024-04-04 ⋅ Mandiant ⋅ Ashley Pearson, Austin Larsen, Billy Wong, John Wolfram, Joseph Pisano, Josh Murchie, Lukasz Lamparski, Matt Lin, Ron Craft, Ryan Hall, Shawn Chew, Tyler McLellan
Cutting Edge, Part 4: Ivanti Connect Secure VPN Post-Exploitation Lateral Movement Case Studies
UNC3569 UNC5266 UNC5291 UNC5330 UNC5337 UTA0178
Credits: MISP Project