Skip to content
yararules.org
Menu

YARA · CAPE Sandbox (CAPEv2)

CAPE_Nitrogenloaderaes

NitrogenLoader AES and IV

GenericCAPE Sandbox (CAPEv2)GNU General Public License v3.0Compiles with YARA-X
Author
enzok
Date
2024-10-29
Modified
2025-07-23
Score / Quality
75 / 70

What this rule detects

NitrogenLoader AES and IV

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
nitrogenloaderaes.yarGNU General Public License v3.0
rule CAPE_Nitrogenloaderaes
{
	meta:
		description = "NitrogenLoader AES and IV"
		author = "enzok"
		id = "c79a00af-52f9-5f07-9c58-e8964e70986f"
		date = "2024-10-29"
		modified = "2025-07-23"
		reference = "https://github.com/kevoreilly/CAPEv2"
		source_url = "https://github.com/kevoreilly/CAPEv2/blob/6b15e76f28cd83fd1187da6c9aaaad2174255356/analyzer/windows/data/yara/NitrogenLoader.yar#L15-L27"
		license_url = "https://github.com/kevoreilly/CAPEv2/blob/6b15e76f28cd83fd1187da6c9aaaad2174255356/LICENSE"
		logic_hash = "de8ed0e98948cfadfd579e334fd9ce9f777ddbd988de897529ba71cb5eb2d396"
		score = 75
		quality = 70
		tags = ""
		cape_options = "bp0=$keyiv0+8,action0=dump:ecx::64,hc0=1,bp1=$keyiv0*-4,action1=dump:ecx::32,hc1=1,count=0"

	strings:
		$keyiv0 = {48 8B 8C 24 [4] E8 [3] 00 4? 89 84 24 [4] 4? 8B 84 24 [4] 4? 89 84 24 [4] 4? 8B 8C 24 [4] E8 [3] 00}
		$keyiv1 = {48 89 84 24 [4] 4? 8B 84 24 [4] 4? 8B 94 24 [4] 4? 8D 8C 24 [4] E8 [3] FF}
		$keyiv2 = {48 63 84 24 [4] 4? 8B C0 4? 8B 94 24 [4] 4? 8D 8C 24 [4] E8 [3] FF 4? 8B 84 24}

	condition:
		all of them
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$keyiv0hex{48 8B 8C 24 [4] E8 [3] 00 4? 89 84 24 [4] 4? 8B 84 24 [4] 4? 89 84 24 [4] 4? 8B 8C 24 [4] E8 [3] 00}
$keyiv1hex{48 89 84 24 [4] 4? 8B 84 24 [4] 4? 8B 94 24 [4] 4? 8D 8C 24 [4] E8 [3] FF}
$keyiv2hex{48 63 84 24 [4] 4? 8B C0 4? 8B 94 24 [4] 4? 8D 8C 24 [4] E8 [3] FF 4? 8B 84 24}

Condition

all of them

In plain words (Heuristic)

  • All patterns in the rule must match.

Test this rule in your browser

Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.

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

Open in editor

References

Licence & attribution

Author: enzok

Source repository: CAPE Sandbox (CAPEv2) @ 6b15e76f28

Licence: GNU General Public License v3.0 (repository licence)

Copyright notice: Cuckoo Sandbox is copyrighted by the Cuckoo Foundation.

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: c79a00af-52f9-5f07-9c58-e8964e70986f

Metadata

cape_optionsbp0=$keyiv0+8,action0=dump:ecx::64,hc0=1,bp1=$keyiv0*-4,action1=dump:ecx::32,hc1=1,count=0

Related rules