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DITEKSHEN_MALWARE_Win_Vovalex

Detects Vovalex ransomware

MalwareVovalexditekSHen 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 Vovalex ransomware

Associated malware family: Vovalex.

Targets: Windows PE.

It defines 6 patterns (6 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-vovalex.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Vovalex : FILE
{
	meta:
		description = "Detects Vovalex ransomware"
		author = "ditekSHen"
		id = "967af585-8a91-5ed0-8400-a8a24d95fd12"
		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#L4705-L4718"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "ea695521981f4b007eee50e95f7989dda1f07cc411c59450489bb17391ff29dc"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "README.VOVALEX.txt" fullword ascii
		$s2 = "\\src\\phobos\\std\\" ascii
		$s3 = "LoadLibraryA(\"Advapi32.dll\")" fullword ascii
		$s4 = "Failed to spawn process \"" fullword ascii
		$s5 = "=== Bypassed ===" fullword ascii
		$s6 = "If you don't know where to buy" ascii

	condition:
		uint16( 0 ) == 0x5a4d and 4 of them
}

Strings (6 patterns)

IdentifierTypeValueModifiers
$s1text"README.VOVALEX.txt"fullword ascii
$s2text"\\src\\phobos\\std\\"ascii
$s3text"LoadLibraryA(\"Advapi32.dll\")"fullword ascii
$s4text"Failed to spawn process \""fullword ascii
$s5text"=== Bypassed ==="fullword ascii
$s6text"If you don't know where to buy"ascii

Condition

uint16( 0 ) == 0x5a4d and 4 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 4 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: 967af585-8a91-5ed0-8400-a8a24d95fd12

Tags:FILE

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