YARA · SEKOIA.IO Community
SEKOIA_Apt_Badmagic_Commonmagic_Usbstealer
Detects CommonMagic related implants
- Author
- Sekoia.io
- Date
- 2023-05-15
- Modified
- 2024-12-19
- Score / Quality
- 75 / 80
What this rule detects
Detects CommonMagic related implants
Associated malware family: Common Magic.
Targets: Windows PE.
It defines 4 patterns (4 text, 0 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
apt-badmagic-commonmagic-usbstealer.yarDetection Rule License 1.1
rule SEKOIA_Apt_Badmagic_Commonmagic_Usbstealer : FILE
{
meta:
= "Detects CommonMagic related implants"
= "Sekoia.io"
= "37d5becc-f1c3-4400-bc10-cd6036d4dbb1"
= "2023-05-15"
= "2024-12-19"
= "https://github.com/SEKOIA-IO/Community"
= "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_badmagic_commonmagic_usbstealer.yar#L1-L20"
= "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
= "a600f17bce9159b581c234cc101d1a0d093954fc9c79052dbca5451714fd7502"
= 75
= 80
= "FILE"
= "1.0"
= "TLP:CLEAR"
strings:
$ = "\\\\.\\pipe\\PipeDtMd" ascii wide fullword
$ = "State USB" ascii wide
$ = "DefaultNameDevice" ascii wide
$ = "SerialNumber" ascii wide
condition:
uint16be( 0 ) == 0x4d5a and filesize < 1MB and all of them
}
Strings (4 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $ | text | "\\\\.\\pipe\\PipeDtMd" | ascii wide fullword |
| $ | text | "State USB" | ascii wide |
| $ | text | "DefaultNameDevice" | ascii wide |
| $ | text | "SerialNumber" | ascii wide |
Condition
uint16be( 0 ) == 0x4d5a and filesize < 1MB and all of themIn plain words (Heuristic)
- The file must start with “MZ” — a Windows executable (PE).
- The file must be smaller than 1MB (a cheap guard that skips large files).
- All patterns in the rule must match.
Test this rule in your browser
Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.
Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.
References
Licence & attribution
Author: Sekoia.io
Source repository: SEKOIA.IO Community @ a438a5901a
Licence: Detection Rule License 1.1 (repository licence)
Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.
Rule id: 37d5becc-f1c3-4400-bc10-cd6036d4dbb1
Metadata
| version | 1.0 |
|---|---|
| classification | TLP:CLEAR |
Tags:FILE
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