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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_Crime_Win32_Parallax_Payload_1

Detects Parallax Injected Payload v1.01

MalwareParallaxSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
@VK_Intel
Date
2020-02-24
Modified
2023-12-05
Score / Quality
75 / 85

What this rule detects

Detects Parallax Injected Payload v1.01

Associated malware family: Parallax.

Targets: Windows PE.

It defines 3 patterns (0 text, 3 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
crime-win32-parallax-payload-1.yarDetection Rule License 1.1
rule SIGNATURE_BASE_Crime_Win32_Parallax_Payload_1 : FILE
{
	meta:
		description = "Detects Parallax Injected Payload v1.01"
		author = "@VK_Intel"
		id = "f3a23a28-e322-59ff-85e0-72e44def5c02"
		date = "2020-02-24"
		modified = "2023-12-05"
		reference = "https://twitter.com/VK_Intel/status/1227976106227224578"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/crime_parallax_rat.yar#L20-L38"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "20d0be64a0e0c2e96729143d41b334603f5d3af3838a458b0627af390ae33fbc"
		logic_hash = "3a1718d7caea5bd6741dd39fc16f955e1d3c73a282d51eda5b63c3352404529e"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$zwdelay_prologue = { 66 ?? ?? ?? 66 83 c1 01 66 ?? ?? ?? 50 b8 cb cb cb cb 89 ?? ?? ?? ?? ?? 58 8b ?? ?? ?? ?? ?? 89 ?? ?? 68 88 13 00 00 8b ?? ?? 8b ?? ?? 51 e8 ?? ?? ?? ??}
		$wininet_call = { b8 77 00 00 00 66 ?? ?? ?? b9 69 00 00 00 66 ?? ?? ?? ba 6e 00 00 00 66 ?? ?? ?? b8 69 00 00 00 66 ?? ?? ?? b9 6e 00 00 00 66 ?? ?? ?? ba 65 00 00 00 66 ?? ?? ?? b8 74 00 00 00 66 ?? ?? ?? 33 c9 66 ?? ?? ?? 8d ?? ?? 52 8b ?? ?? 8b ?? ?? ff d1 89 ?? ?? 6a 00 68 0c fc e5 f2 8b ?? ?? 52 e8 ?? ?? ?? ?? 83 c4 0c 89 ?? ?? 6a 00 68 3d a8 16 da 8b ?? ?? 50 e8 ?? ?? ?? ?? 83 c4 0c 89 ?? ?? 6a 00 68 e0 05 65 01 8b ?? ?? 51 e8 ?? ?? ?? ?? 83 c4 0c 89 ?? ?? 6a 00 68 f5 98 c0 6c 8b ?? ?? 52 e8 ?? ?? ?? ?? 83 c4 0c 89 ?? ?? 6a 00 68 24 1d 19 e5 8b ?? ?? 50 e8 ?? ?? ?? ?? 83 c4 0c 89 ?? ?? 6a 00 68 a8 ed f2 ce 8b ?? ?? 8b ?? ?? 52 e8 ?? ?? ?? ?? 83 c4 0c 89 ?? ?? 6a 00 6a 00 ff ?? ?? 85 c0 75 ?? 68 88 13 00 00 ff ?? ?? eb ?? 6a 00 68 00 01 00 04 6a }
		$rand_png_call = { b8 25 00 00 00 66 ?? ?? ?? ?? ?? ?? b9 78 00 00 00 66 ?? ?? ?? ?? ?? ?? ba 2e 00 00 00 66 ?? ?? ?? ?? ?? ?? b8 70 00 00 00 66 ?? ?? ?? ?? ?? ?? b9 6e 00 00 00 66 ?? ?? ?? ?? ?? ?? ba 67 00 00 00 66 ?? ?? ?? ?? ?? ?? 33 c0 66 ?? ?? ?? ?? ?? ?? 6a 64 6a 40 8b ?? ?? 8b ?? ?? ff d2 89 ?? ?? 8b ?? ?? 50 68 00 e1 f5 05 68 10 27 00 00 e8 ?? ?? ?? ??}

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 100KB and 2 of them
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$zwdelay_prologuehex{ 66 ?? ?? ?? 66 83 c1 01 66 ?? ?? ?? 50 b8 cb cb cb cb 89 ?? ?? ?? ?? ?? 58 8b ?? ?? ?? ?? ?? 89 ?? ?? 68 88 13 00 00 8b ?? ?? 8b ?? ?? 51 e8 ?? ?? ?? ??}
$wininet_callhex{ b8 77 00 00 00 66 ?? ?? ?? b9 69 00 00 00 66 ?? ?? ?? ba 6e 00 00 00 66 ?? ?? ?? b8 69 00 00 00 66 ?? ?? ?? b9 6e 00 00 00 66 ?? ?? ?? ba 65 00 00 00 66 ?? ?? …
$rand_png_callhex{ b8 25 00 00 00 66 ?? ?? ?? ?? ?? ?? b9 78 00 00 00 66 ?? ?? ?? ?? ?? ?? ba 2e 00 00 00 66 ?? ?? ?? ?? ?? ?? b8 70 00 00 00 66 ?? ?? ?? ?? ?? ?? b9 6e 00 00 00 …

Condition

uint16( 0 ) == 0x5a4d and filesize < 100KB and 2 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 100KB (a cheap guard that skips large files).
  • At least 2 patterns in the rule must match.

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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).

  • 20d0be64a0e0c2e96729143d41b334603f5d3af3838a458b0627af390ae33fbc

Licence & attribution

Author: @VK_Intel

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: f3a23a28-e322-59ff-85e0-72e44def5c02

Tags:FILE

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