BRICKSTORM has commands that allow the actor download files from the compromised host to the C2 server, and to also download specific sections of a file.15
tool
BRICKSTORM S9015
- Type
- malware
- Platforms
- ESXi, Linux, Network Devices, Windows
- Created
- 16 April 2026
- Last modified
- 23 April 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]
25
TechniquesTop 12%
10
TacticsTop 6%
0
Threat groupsNone recorded
0
CampaignsNone recorded
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S9015
BRICKSTORM has utilized Go libraries to include Garble to obfuscate code.1617
BRICKSTORM has utilized XOR cipher encryption to hide key strings within their code, to include IPv4 addresses of public DNS-over-HTTPS (DOH) servers.18
BRICKSTORM has appeared to resemble legitimate processes to include the vCenter process vami-http.192021 BRICKSTORM has also leveraged legitimate names of VMware vSphere platform such as vmsrc or vmware-sphere.22
BRICKSTORM has uploaded files from the victim system to C2 servers.23242526272829
BRICKSTORM has the ability to check if it is running as an active child process through the detection of a specific environment variable.30
Standing S9015
Reach is how much of ATT&CK this tool touches. Coverage is how well defended each thing it does is, as a median per technique rather than a total — a total would just restate the reach. Each figure is ranked against all 825 ATT&CK software entries only where that population actually spreads. Where most of the population shares one value, a percentile would rank the tie instead of the entity, so the raw value is shown and no rank is claimed.
Reach
Techniques25Top 12%
88th percentile · 88% of 825 ATT&CK software entries have this many Enterprise techniques or fewer.
Tactics10Top 6%
94th percentile · 94% of 825 ATT&CK software entries have this many tactics spanned or fewer.
Threat groups061% tie · 22 values
61% of the population shares a single value across only 22 distinct values, so a percentile here would rank the tie, not the entity.
Campaigns085% tie · 8 values
85% of the population shares a single value across only 8 distinct values, so a percentile here would rank the tie, not the entity.
Coverage
Rules / technique19med42nd pct
42nd percentile · 58% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique3med
Detection coverage S9015
597 distinct rules cover the 25 techniques recorded for this tool. The 652 technique-to-rule mappings resolve to 597 distinct rules, because one rule can cover several techniques. 432 Sigma · 165 Splunk.
23 covered by at least one rule2 with no coverage597 distinct rules in total
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