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SEKOIA_Apt_Sidecopy_Actionrat_Packer_Strings

Detects SideCopy's ActionRAT (packer?)

APT / threat actorAction RatSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2023-05-11
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects SideCopy's ActionRAT (packer?)

Associated malware family: Action Rat.

Targets: Windows PE.

It defines 3 patterns (3 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

apt-sidecopy-actionrat-packer-strings.yarDetection Rule License 1.1
rule SEKOIA_Apt_Sidecopy_Actionrat_Packer_Strings : FILE
{
	meta:
		description = "Detects SideCopy's ActionRAT (packer?)"
		author = "Sekoia.io"
		id = "b9370bd5-12e1-448e-a5b1-2acc72adc4a7"
		date = "2023-05-11"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_sidecopy_actionrat_packer_strings.yar#L1-L19"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "1bb6896ac3efa0e43cc27f56d7324ab9bdd2c401941eeefc4e7be62b407657af"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "(HTTP/1\\.[01]) (\\d{3})(?: (.*?))?"
		$ = "cpp-httplib/0.7"
		$ = "\\HTTP Arsanel\\"

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

Strings (3 patterns)

IdentifierTypeValueModifiers
$text"(HTTP/1\\.[01]) (\\d{3})(?: (.*?))?"
$text"cpp-httplib/0.7"
$text"\\HTTP Arsanel\\"

Condition

uint16be( 0 ) == 0x4d5a and filesize < 1MB and all 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).
  • All 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: b9370bd5-12e1-448e-a5b1-2acc72adc4a7

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE

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