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EMBEERESEARCH_Win_Orcus_Rat_Simple_Strings_Dec_2023

Strings observed in Orcus RAT

MalwareEmbee ResearchDetection Rule License 1.1Compiles with YARA-X
Author
Matthew @ Embee_Research
Date
2023-12-24
Score / Quality
75 / 75

What this rule detects

Strings observed in Orcus RAT

It defines 8 patterns (8 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-orcus-rat-simple-strings-dec-2023.yarDetection Rule License 1.1
rule EMBEERESEARCH_Win_Orcus_Rat_Simple_Strings_Dec_2023
{
	meta:
		description = "Strings observed in Orcus RAT"
		author = "Matthew @ Embee_Research"
		id = "baef6b96-bf94-5363-9186-9761a8055afd"
		date = "2023-12-24"
		modified = "2023-12-24"
		reference = "https://github.com/embee-research/Yara-detection-rules/"
		source_url = "https://github.com/embee-research/Yara-detection-rules//blob/ac56d6f6fd2a30c8cb6e5c0455d6519210a8b0f4/Rules/win_orcus_rat_simple_strings_dec_2023.yar#L1-L26"
		license_url = "N/A"
		hash = "30a2a674d55d7898d304713dd2f69a043d875230ea7ebee22596ba4c640768db"
		logic_hash = "2e0a44ec2749e0fc646dfb003a2d32b3fecfa07ece72ca5a65116250d80496b8"
		score = 75
		quality = 75
		tags = ""

	strings:
		$s1 = "Orcus is a Remote Administration Tool for Windows. It allows the administrator to make changes to the system remotely." wide
		$s2 = "Orcus.Service" wide
		$s4 = "costura.orcus" wide
		$s5 = "Orcus.Commands"
		$s6 = "Orcus.Shared"
		$s7 = "Orcus.Utilities"
		$s8 = "Orcus.StaticCommands"
		$s9 = "Orcus.Plugins"

	condition:
		(5 of them )
}

Strings (8 patterns)

IdentifierTypeValueModifiers
$s1text"Orcus is a Remote Administration Tool for Windows. It allows the administrator to make changes to the system remotely."wide
$s2text"Orcus.Service"wide
$s4text"costura.orcus"wide
$s5text"Orcus.Commands"
$s6text"Orcus.Shared"
$s7text"Orcus.Utilities"
$s8text"Orcus.StaticCommands"
$s9text"Orcus.Plugins"

Condition

(5 of them )

In plain words (Heuristic)

  • At least 5 patterns in the rule must match.

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References

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

  • 30a2a674d55d7898d304713dd2f69a043d875230ea7ebee22596ba4c640768db

Licence & attribution

Author: Matthew @ Embee_Research

Source repository: Embee Research @ ac56d6f6fd

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: baef6b96-bf94-5363-9186-9761a8055afd