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YARA · ditekSHen detection

DITEKSHEN_MALWARE_Win_Avoslocker

Hunt for AvosLocker ransomware

MalwareAvos LockerditekSHen 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

Hunt for AvosLocker ransomware

Associated malware family: Avos Locker.

Targets: Windows PE.

It defines 2 patterns (2 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

malware-win-avoslocker.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Avoslocker : FILE
{
	meta:
		description = "Hunt for AvosLocker ransomware"
		author = "ditekSHen"
		id = "390e57b2-207e-5013-899a-0b04aa63a56f"
		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#L6748-L6757"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "85601fdd13ddeb1fc0b8b98eb68e324046d60c1ae9467d083a75abebcb50e3a0"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "GET_YOUR_FILES_BACK.txt" ascii wide
		$s2 = ".avos" fullword ascii wide

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

Strings (2 patterns)

IdentifierTypeValueModifiers
$s1text"GET_YOUR_FILES_BACK.txt"ascii wide
$s2text".avos"fullword ascii wide

Condition

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

In plain words (Heuristic)

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

Test this rule in your browser

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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

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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: 390e57b2-207e-5013-899a-0b04aa63a56f

Tags:FILE

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