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SEKOIA_Apt_Sandworm_Orcshred_Apr2022

Detects the ORCSHRED script

APT / threat actorSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2022-04-12
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects the ORCSHRED script

It defines 4 patterns (4 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

apt-sandworm-orcshred-apr2022.yarDetection Rule License 1.1
rule SEKOIA_Apt_Sandworm_Orcshred_Apr2022 : FILE
{
	meta:
		description = "Detects the ORCSHRED script"
		author = "Sekoia.io"
		id = "1a88800c-29e1-4e2c-8374-f5a93dd9fd91"
		date = "2022-04-12"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_sandworm_orcshred_apr2022.yar#L1-L18"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "de38cf43fa5cc756c26ae241f2e60636c2aabbe4254fdeca2340c62873498de7"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "find /etc -name os-release >"
		$ = "/bin/bash /var/"
		$ = "crontab -l >"
		$ = ".sh & disown"

	condition:
		3 of them and filesize < 2KB
}

Strings (4 patterns)

IdentifierTypeValueModifiers
$text"find /etc -name os-release >"
$text"/bin/bash /var/"
$text"crontab -l >"
$text".sh & disown"

Condition

3 of them and filesize < 2KB

In plain words (Heuristic)

  • The file must be smaller than 2KB (a cheap guard that skips large files).
  • At least 3 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: 1a88800c-29e1-4e2c-8374-f5a93dd9fd91

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE