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DITEKSHEN_MALWARE_Win_Cobianrat

Detects CobianRAT, a fork of Njrat

MalwareCobianratditekSHen detectionBSD 2-Clause LicenseCompiles with YARA-X
Author
ditekSHen
Date
2020-11-06
Modified
2024-11-01
Score / Quality
75 / 75

What this rule detects

Detects CobianRAT, a fork of Njrat

Associated malware family: Cobianrat.

Targets: Windows PE.

It defines 7 patterns (7 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

malware-win-cobianrat.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Cobianrat : FILE
{
	meta:
		description = "Detects CobianRAT, a fork of Njrat"
		author = "ditekSHen"
		id = "5a9b6f04-fc52-52a9-b72f-d24dd093e886"
		date = "2020-11-06"
		modified = "2024-11-01"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/malware.yar#L5626-L5640"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "5c8f55e5328b61c3591c876797b4521f8e98af7a6c53bab918f10d5c3c2b5013"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "1.0.40.7" fullword wide
		$s2 = "DownloadData" fullword wide
		$s3 = "Executed As" fullword wide
		$s4 = "\\Plugins" fullword wide
		$s5 = "LOGIN" fullword wide
		$s6 = "software\\microsoft\\windows\\currentversion\\run" wide
		$s7 = "Hidden" fullword wide

	condition:
		uint16( 0 ) == 0x5a4d and 5 of them
}

Strings (7 patterns)

IdentifierTypeValueModifiers
$s1text"1.0.40.7"fullword wide
$s2text"DownloadData"fullword wide
$s3text"Executed As"fullword wide
$s4text"\\Plugins"fullword wide
$s5text"LOGIN"fullword wide
$s6text"software\\microsoft\\windows\\currentversion\\run"wide
$s7text"Hidden"fullword wide

Condition

uint16( 0 ) == 0x5a4d and 5 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 5 patterns in the rule must match.

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References

Licence & attribution

Author: ditekSHen

Source repository: ditekSHen detection @ e76c93dcde

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright 2021 by ditekSHen (https://github.com/ditekshen/detection).

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 5a9b6f04-fc52-52a9-b72f-d24dd093e886

Tags:FILE