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DITEKSHEN_MALWARE_Win_Ranzylocker

Detects RanzyLocker / REntS ransomware

MalwareRanzylockerditekSHen 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 RanzyLocker / REntS ransomware

Associated malware family: Ranzylocker.

Targets: Windows PE.

It defines 16 patterns (12 text, 4 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-ranzylocker.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Ranzylocker : FILE
{
	meta:
		description = "Detects RanzyLocker / REntS ransomware"
		author = "ditekSHen"
		id = "0d74f6fd-e1d2-5939-991e-7fdd2ca3310b"
		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#L5019-L5042"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "15897144843acf49b81c5428fd1bb56d7a2acf16047a6e5d3ca4f2aaa8891577"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$hr1 = "776261646D696E2044454C4554452053595354454D53544154454241434B5550" ascii
		$hr2 = "776D69632E65786520534841444F57434F5059202F6E6F696E746572616374697665" ascii
		$hr3 = "626364656469742E657865202F736574207B64656661756C747D207265636F76657279656E61626C6564204E6F" ascii
		$hr4 = "776261646D696E2044454C4554452053595354454D53544154454241434B5550202D64656C6574654F6C64657374" ascii
		$hr5 = "626364656469742E657865202F736574207B64656661756C747D20626F6F74737461747573706F6C6963792069676E6F7265616C6C6661696C75726573" ascii
		$hr6 = "76737361646D696E2E6578652044656C65746520536861646F7773202F416C6C202F5175696574" ascii
		$hx1 = "476C6F62616C5C33353335354641352D303745392D343238422D423541352D314338384341423242343838" ascii
		$hx2 = "534F4654574152455C4D6963726F736F66745C45524944" ascii
		$hx3 = "227375626964223A22" ascii
		$hx4 = "226E6574776F726B223A22" ascii
		$hx5 = "726561646D652E747874" ascii
		$hx6 = "-nolan" fullword wide
		$o1 = { 8d 45 e9 89 9d 54 ff ff ff 88 9d 44 ff ff ff 3b }
		$o2 = { 8b 44 24 2? 8b ?c 24 34 40 8b 54 24 38 89 44 24 }
		$o3 = { 8b 44 24 2? 8b ?c 24 1c 89 44 24 34 8b 44 24 28 }
		$o4 = { 8b 44 24 2? 8b ?c 24 34 05 00 00 a0 00 89 44 24 }

	condition:
		uint16( 0 ) == 0x5a4d and ( all of ( $hx* ) or ( 2 of ( $hr* ) and 2 of ( $hx* ) ) or ( all of ( $o* ) and 2 of ( $h* ) ) )
}

Strings (16 patterns)

IdentifierTypeValueModifiers
$hr1text"776261646D696E2044454C4554452053595354454D53544154454241434B5550"ascii
$hr2text"776D69632E65786520534841444F57434F5059202F6E6F696E746572616374697665"ascii
$hr3text"626364656469742E657865202F736574207B64656661756C747D207265636F76657279656E61626C6564204E6F"ascii
$hr4text"776261646D696E2044454C4554452053595354454D53544154454241434B5550202D64656C6574654F6C64657374"ascii
$hr5text"626364656469742E657865202F736574207B64656661756C747D20626F6F74737461747573706F6C6963792069676E6F7265616C6C6661696C75726573"ascii
$hr6text"76737361646D696E2E6578652044656C65746520536861646F7773202F416C6C202F5175696574"ascii
$hx1text"476C6F62616C5C33353335354641352D303745392D343238422D423541352D314338384341423242343838"ascii
$hx2text"534F4654574152455C4D6963726F736F66745C45524944"ascii
$hx3text"227375626964223A22"ascii
$hx4text"226E6574776F726B223A22"ascii
$hx5text"726561646D652E747874"ascii
$hx6text"-nolan"fullword wide
$o1hex{ 8d 45 e9 89 9d 54 ff ff ff 88 9d 44 ff ff ff 3b }
$o2hex{ 8b 44 24 2? 8b ?c 24 34 40 8b 54 24 38 89 44 24 }
$o3hex{ 8b 44 24 2? 8b ?c 24 1c 89 44 24 34 8b 44 24 28 }
$o4hex{ 8b 44 24 2? 8b ?c 24 34 05 00 00 a0 00 89 44 24 }

Condition

uint16( 0 ) == 0x5a4d and ( all of ( $hx* ) or ( 2 of ( $hr* ) and 2 of ( $hx* ) ) or ( all of ( $o* ) and 2 of ( $h* ) ) )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • All patterns in ( $hx* ) must match.
  • All patterns in ( $o* ) must match.
  • At least 2 patterns in ( $hr* ) must match.
  • At least 2 patterns in ( $hx* ) must match.
  • At least 2 patterns in ( $h* ) 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: 0d74f6fd-e1d2-5939-991e-7fdd2ca3310b

Tags:FILE

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