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YARA · SEKOIA.IO Community

SEKOIA_Generic_Sharpshooter_Payload_5

Detects payload created by SharpShooter

GenericSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2023-02-03
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects payload created by SharpShooter

It defines 5 patterns (5 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

generic-sharpshooter-payload-5.yarDetection Rule License 1.1
rule SEKOIA_Generic_Sharpshooter_Payload_5 : FILE
{
	meta:
		description = "Detects payload created by SharpShooter"
		author = "Sekoia.io"
		id = "cb4d266e-f2b7-4642-a223-57180e66a9a6"
		date = "2023-02-03"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/generic_sharpshooter_payload_5.yar#L1-L19"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "a68342b5bb2622deb71432da85cc249f35ca5b7b5dc70e069d6dcb6e9488e97e"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "rc4 = function(key, str)"
		$ = "<job id=\"JS Code\""
		$ = "var e={},i,b=0,c,x,l=0,a,r="
		$ = "var plain = rc4("
		$ = "eval(plain);"

	condition:
		all of them and filesize < 2MB
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$text"rc4 = function(key, str)"
$text"<job id=\"JS Code\""
$text"var e={},i,b=0,c,x,l=0,a,r="
$text"var plain = rc4("
$text"eval(plain);"

Condition

all of them and filesize < 2MB

In plain words (Heuristic)

  • The file must be smaller than 2MB (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: cb4d266e-f2b7-4642-a223-57180e66a9a6

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE