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SEKOIA_Backdoor_Win_Sidewinder_Cobaltstrike_2022_09

Detect the SideWinder malware

MalwareSidewinderCobalt StrikeSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X (with warnings)
Author
Sekoia.io
Date
2022-10-24
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detect the SideWinder malware

Associated malware family: Sidewinder, Cobalt Strike.

Targets: Windows PE.

It defines 1 patterns (0 text, 1 hex, 0 regex). YARA modules used: pe, hash.

YARA-X says: warning[deprecated_field]: field `number_of_sections` is deprecated

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

Includes the imports needed to compile it on its own.

backdoor-win-sidewinder-cobaltstrike-2022-09.yarDetection Rule License 1.1
import "pe"
import "hash"

rule SEKOIA_Backdoor_Win_Sidewinder_Cobaltstrike_2022_09
{
	meta:
		description = "Detect the SideWinder malware"
		author = "Sekoia.io"
		id = "b5e8f87a-4a2c-49bb-aa98-bf3fb5056b23"
		date = "2022-10-24"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/backdoor_win_sidewinder_cobaltstrike_2022_09.yar#L4-L29"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "f2b719170783c1bfaa4c4772e5cff73797be3056204566844c236d1857869e4c"
		score = 75
		quality = 80
		tags = ""
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = {65004e004500560045005200200047004f004e004e00410020004700490056004500200059004f0055002000550050002100}

	condition:
		$s1 or pe.imphash ( ) == "b1e345b2d78e4b82617d995d18100790" or for any i in ( 0 .. pe.number_of_sections -1 ) : ( hash.md5 ( pe.sections [ i ] . raw_data_offset , pe.sections [ i ] . raw_data_size ) == "ac989507d4af352fa354560efef99ba6" or hash.md5 ( pe.sections [ i ] . raw_data_offset , pe.sections [ i ] . raw_data_size ) == "8090b29a44c750b7b21287f9639fe747" or hash.md5 ( pe.sections [ i ] . raw_data_offset , pe.sections [ i ] . raw_data_size ) == "ea8693d6bacf3e7876f717a3d8abc433" )
}

Strings (1 patterns)

IdentifierTypeValueModifiers
$s1hex{65004e004500560045005200200047004f004e004e00410020004700490056004500200059004f0055002000550050002100}

Condition

$s1 or pe.imphash ( ) == "b1e345b2d78e4b82617d995d18100790" or for any i in ( 0 .. pe.number_of_sections -1 ) : ( hash.md5 ( pe.sections [ i ] . raw_data_offset , pe.sections [ i ] . raw_data_size ) == "ac989507d4af352fa354560efef99ba6" or hash.md5 ( pe.sections [ i ] . raw_data_offset , pe.sections [ i ] . raw_data_size ) == "8090b29a44c750b7b21287f9639fe747" or hash.md5 ( pe.sections [ i ] . raw_data_offset , pe.sections [ i ] . raw_data_size ) == "ea8693d6bacf3e7876f717a3d8abc433" )

In plain words (Heuristic)

  • A for-loop checks a property over several matches or items.
  • Pattern $s1 must be present.
  • Uses the pe module.
  • Uses the hash module.
  • Compares a hash of the file or a part of it.
  • Checks the PE import hash (imphash).
  • Checks PE sections (names, count or properties).

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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: b5e8f87a-4a2c-49bb-aa98-bf3fb5056b23

Metadata

version1.0
classificationTLP:CLEAR

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