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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_MAL_RANSOM_Ragna_Locker_Apr20_1

Detects Ragna Locker Ransomware

MalwareSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth (Nextron Systems)
Date
2020-04-27
Modified
2023-12-05
Score / Quality
75 / 85

What this rule detects

Detects Ragna Locker Ransomware

Targets: Windows PE.

It defines 8 patterns (2 text, 6 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
mal-ransom-ragna-locker-apr20-1.yarDetection Rule License 1.1
rule SIGNATURE_BASE_MAL_RANSOM_Ragna_Locker_Apr20_1 : FILE
{
	meta:
		description = "Detects Ragna Locker Ransomware"
		author = "Florian Roth (Nextron Systems)"
		id = "67164cb4-73b7-5c4e-88f9-42379b88c641"
		date = "2020-04-27"
		modified = "2023-12-05"
		reference = "https://otx.alienvault.com/indicator/file/c2bd70495630ed8279de0713a010e5e55f3da29323b59ef71401b12942ba52f6"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/crime_ransom_ragna_locker.yar#L3-L36"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "c2bd70495630ed8279de0713a010e5e55f3da29323b59ef71401b12942ba52f6"
		logic_hash = "05a18818f22c836c3e1f1fa9682d787bbe86e6d3bb026a80a7d4c33ad95c2cd3"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$x1 = "---RAGNAR SECRET---" ascii
		$xc1 = { 0D 0A 25 73 0D 0A 0D 0A 25 73 0D 0A 25 73 0D 0A
               25 73 0D 0A 0D 0A 25 73 0D 0A 00 00 2E 00 72 00
               61 00 67 00 6E 00 61 00 72 00 5F }
		$xc2 = { 00 2D 00 66 00 6F 00 72 00 63 00 65 00 00 00 00
               00 57 00 69 00 6E 00 53 00 74 00 61 00 30 00 5C
               00 44 00 65 00 66 00 61 00 75 00 6C 00 74 00 00
               00 5C 00 6E 00 6F 00 74 00 65 00 70 00 61 00 64
               00 2E 00 65 00 78 00 65 00 }
		$s1 = "bootfont.bin" wide fullword
		$sc2 = { 00 57 00 69 00 6E 00 64 00 6F 00 77 00 73 00 00
               00 57 00 69 00 6E 00 64 00 6F 00 77 00 73 00 2E
               00 6F 00 6C 00 64 00 00 00 54 00 6F 00 72 00 20
               00 62 00 72 00 6F 00 77 00 73 00 65 00 72 00 }
		$op1 = { c7 85 58 ff ff ff 55 00 6b 00 c7 85 5c ff ff ff }
		$op2 = { 50 c7 85 7a ff ff ff 5c }
		$op3 = { 8b 75 08 8a 84 0d 20 ff ff ff ff 45 08 32 06 8b }

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 200KB and 1 of ( $x* ) or 4 of them
}

Strings (8 patterns)

IdentifierTypeValueModifiers
$x1text"---RAGNAR SECRET---"ascii
$xc1hex{ 0D 0A 25 73 0D 0A 0D 0A 25 73 0D 0A 25 73 0D 0A 25 73 0D 0A 0D 0A 25 73 0D 0A 00 00 2E 00 72 00 61 00 67 00 6E 00 61 00 72 00 5F …
$xc2hex{ 00 2D 00 66 00 6F 00 72 00 63 00 65 00 00 00 00 00 57 00 69 00 6E 00 53 00 74 00 61 00 30 00 5C 00 44 00 65 00 66 00 61 00 75 00 …
$s1text"bootfont.bin"wide fullword
$sc2hex{ 00 57 00 69 00 6E 00 64 00 6F 00 77 00 73 00 00 00 57 00 69 00 6E 00 64 00 6F 00 77 00 73 00 2E 00 6F 00 6C 00 64 00 00 00 54 00 …
$op1hex{ c7 85 58 ff ff ff 55 00 6b 00 c7 85 5c ff ff ff }
$op2hex{ 50 c7 85 7a ff ff ff 5c }
$op3hex{ 8b 75 08 8a 84 0d 20 ff ff ff ff 45 08 32 06 8b }

Condition

uint16( 0 ) == 0x5a4d and filesize < 200KB and 1 of ( $x* ) or 4 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 200KB (a cheap guard that skips large files).
  • At least 1 patterns in ( $x* ) must match.
  • At least 4 patterns in the rule must match.

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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

Sample hashes

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

  • c2bd70495630ed8279de0713a010e5e55f3da29323b59ef71401b12942ba52f6

Licence & attribution

Author: Florian Roth (Nextron Systems)

Source repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

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: 67164cb4-73b7-5c4e-88f9-42379b88c641

Tags:FILE

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