BRICKSTORM
- ID
- S9015
- Type
- Malware
- Platforms
- ESXi, Linux, Network Devices, Windows
- Source
- attack.mitre.org
- MITRE last modified
- 23 Apr 2026
BRICKSTORM is a cross-platform backdoor with variants written in Go and Rust that facilitates command and control, the ingress transfer of other malware, and the exfiltration of data.[1][2][3][4] BRICKSTORM has also been created from a .NET application using ahead-of-time (AOT) compilation to blend in within victim environments.[1] BRICKSTORM was first observed in April 2024.[5] BRICKSTORM has previously been leveraged by People's Republic of China (PRC) state-nexus actors identified as UNC6201, UNC5221, WARP PANDA, PunyToad, and SYLVANITE.[6][7][1][8][9][10][3][4]
Techniques used (25)
- T1005 Data from Local System
- T1027 Obfuscated Files or Information
- T1027.013 Encrypted/Encoded File
- T1036.005 Match Legitimate Resource Name or Location
- T1041 Exfiltration Over C2 Channel
- T1057 Process Discovery
- T1059.004 Unix Shell
- T1070.004 File Deletion
- T1070.010 Relocate Malware
- T1071.001 Web Protocols
- T1071.004 DNS
- T1083 File and Directory Discovery
- T1090.001 Internal Proxy
- T1102 Web Service
- T1105 Ingress Tool Transfer
- T1132.001 Standard Encoding
- T1140 Deobfuscate/Decode Files or Information
- T1489 Service Stop
- T1543 Create or Modify System Process
- T1568 Dynamic Resolution
- T1572 Protocol Tunneling
- T1573.002 Asymmetric Cryptography
- T1574.007 Path Interception by PATH Environment Variable
- T1678 Delay Execution
- T1690 Prevent Command History Logging
References
- CISA BRICKSTORM UNC5221 AR25-338A February 2026
- Picus Security BRICKSTORM UNC5221 October 2025
- Resecurity UNC5221 BRICKSTORM F5 Big-IP October 2025
- Google BRICKSTORM September 2025
- Google UNC5221 BRICKSTORM SPAWNCHIMERA April 2024
- Cloudflare 2026 Threat Report New Threat Actors March 2026
- CrowdStrike BRICKSTORM WARP PANDA UNC5221 December 2025
- Dragos SYLVANITE MuddyWater Electrum March 2026
- NVISO BRICKSTORM April 2025
- Google BRICKSTORM GRIMBOLT UNC5221 UNC6201 February 2026
