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SEKOIA_Apt_Badmagic_Commonmagic_Generic_2

Detects CommonMagic related implants

APT / threat actorCommon MagicSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
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

Download .yar
apt-badmagic-commonmagic-generic-2.yarDetection Rule License 1.1
rule SEKOIA_Apt_Badmagic_Commonmagic_Generic_2 : FILE
{
	meta:
		description = "Detects CommonMagic related implants"
		author = "Sekoia.io"
		id = "c6a16ecc-e00a-4756-b603-f6c85e4f4220"
		date = "2023-05-15"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_badmagic_commonmagic_generic_2.yar#L1-L20"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "d3916ab749ae5b6e0a8abdc9641de13e0328809a6e20c6ce04ada5dbfb742689"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "\\CommonCommand\\" ascii wide
		$ = "\\\\.\\pipe\\PipeMd" ascii wide fullword
		$ = "\\\\.\\pipe\\PipeDtMd" ascii wide fullword
		$ = "\\\\.\\pipe\\PipeCrDtMd" ascii wide fullword

	condition:
		uint16be( 0 ) == 0x4d5a and filesize < 1MB and 2 of them
}

Strings (4 patterns)

IdentifierTypeValueModifiers
$text"\\CommonCommand\\"ascii wide
$text"\\\\.\\pipe\\PipeMd"ascii wide fullword
$text"\\\\.\\pipe\\PipeDtMd"ascii wide fullword
$text"\\\\.\\pipe\\PipeCrDtMd"ascii wide fullword

Condition

uint16be( 0 ) == 0x4d5a and filesize < 1MB and 2 of them

In 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).
  • At least 2 patterns in the rule must match.

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References

Licence & attribution

Author: Sekoia.io

Source repository: SEKOIA.IO Community @ a438a5901a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: c6a16ecc-e00a-4756-b603-f6c85e4f4220

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE

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