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CAPE_Nitrogenloaderconfig

NitrogenLoader Config Extraction

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 Config Extraction

It defines 14 patterns (0 text, 14 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
nitrogenloaderconfig.yarGNU General Public License v3.0
rule CAPE_Nitrogenloaderconfig
{
	meta:
		description = "NitrogenLoader Config Extraction"
		author = "enzok"
		id = "0c8d0655-0592-52b5-b51d-3acdb15a4864"
		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#L43-L66"
		license_url = "https://github.com/kevoreilly/CAPEv2/blob/6b15e76f28cd83fd1187da6c9aaaad2174255356/LICENSE"
		logic_hash = "06d49ebf3f67476c83a77734dff0245a51027a35d92e5af07bb9146db5b156ca"
		score = 75
		quality = 70
		tags = ""
		cape_options = "bp0=$decrypt1*+1,bp1=$key*,hc0=1,count=0,action0=string:rcx,action1=string:rdx,typestring=NitrogenLoader Config"

	strings:
		$decrypt1 = {48 63 4? 24 ?? 33 D2 48 [0-3] F7 B4 24 [4] 48 8B C2 48 8B 8C 24 [4] 0F BE 04 01}
		$decrypt2 = {8B ?? 24 [1-4] 33 C8 8B C1 48 63 4C 24 ?? 48 8B 94 24 [4] 88 04 0A}
		$decrypt3 = {8B 8C 24 ?? ?? ?? ?? 2B C8 8B C1 48 63 4C 24 ?? 48 8B 94 24 [4] 88 04 0A}
		$key = {74 ?? E8 [4] 85 C0 75 ?? 4? 8B 0D [3] 00 4? 8D 15 [3] 00 E8}
		$taskman_1 = {E8 [4] B9 61 00 00 00 88 84 24 [4] E8 [4] B9 73 00 00 00 88 84 24 [4] E8 [4] B9 6B 00 00 00 88 84 24 [4] E8 [3] FF}
		$taskman_2 = {B9 4D 00 00 00 88 84 24 [4] E8 [4] B9 61 00 00 00 88 84 24 [4] E8 [4] B9 6E 00 00 00 88 84 24 [4] E8 [3] FF}
		$taskman_3 = {B9 61 00 00 00 88 84 24 [4] E8 [4] B9 67 00 00 00 88 84 24 [4] E8 [4] B9 65 00 00 00 88 84 24 [4] E8 [3] FF}
		$taskman_4 = {B9 72 00 00 00 88 84 24 [4] E8 [4] 31 C9 88 84 24 [4] E8 [3] FF}
		$installers_1 = {B9 49 00 00 00 E8 [4] B9 6E 00 00 00 88 84 24 [4] E8 [4] B9 73 00 00 00 88 84 24 [4] E8 [3] FF}
		$installers_2 = {B9 74 00 00 00 88 84 24 [4] E8 [4] B9 61 00 00 00 88 84 24 [4] E8 [4] B9 6C 00 00 00 88 84 24 [4] E8 [3] FF}
		$installers_3 = {B9 6C 00 00 00 88 84 24 [4] E8 [4] B9 65 00 00 00 88 84 24 [4] E8 [3] FF}
		$installers_4 = {B9 72 00 00 00 88 84 24 [4] E8 [4] B9 73 00 00 00 88 84 24 [4] E8 [3] FF}
		$rc4decrypt_1 = {48 89 ?? 4? 89 ?? E8 [4] 4? 8B ?? 24 [1-4] 4? 89 ?? 4? 89 ?? 4? 89 C1 [0-1] 89 ?? E8 [4] 4? 89}
		$rc4decrypt_2 = {E8 [4] 8B ?? 24 [1-4] 4? 89 ?? 48 89 ?? 4? 89 C1 E8 [3] FF}

	condition:
		any of ( $decrypt* ) or ( $key and ( 3 of ( $taskman_* ) or 3 of ( $installers* ) and 1 of ( $rc4decrypt_* ) ) )
}

Strings (14 patterns)

IdentifierTypeValueModifiers
$decrypt1hex{48 63 4? 24 ?? 33 D2 48 [0-3] F7 B4 24 [4] 48 8B C2 48 8B 8C 24 [4] 0F BE 04 01}
$decrypt2hex{8B ?? 24 [1-4] 33 C8 8B C1 48 63 4C 24 ?? 48 8B 94 24 [4] 88 04 0A}
$decrypt3hex{8B 8C 24 ?? ?? ?? ?? 2B C8 8B C1 48 63 4C 24 ?? 48 8B 94 24 [4] 88 04 0A}
$keyhex{74 ?? E8 [4] 85 C0 75 ?? 4? 8B 0D [3] 00 4? 8D 15 [3] 00 E8}
$taskman_1hex{E8 [4] B9 61 00 00 00 88 84 24 [4] E8 [4] B9 73 00 00 00 88 84 24 [4] E8 [4] B9 6B 00 00 00 88 84 24 [4] E8 [3] FF}
$taskman_2hex{B9 4D 00 00 00 88 84 24 [4] E8 [4] B9 61 00 00 00 88 84 24 [4] E8 [4] B9 6E 00 00 00 88 84 24 [4] E8 [3] FF}
$taskman_3hex{B9 61 00 00 00 88 84 24 [4] E8 [4] B9 67 00 00 00 88 84 24 [4] E8 [4] B9 65 00 00 00 88 84 24 [4] E8 [3] FF}
$taskman_4hex{B9 72 00 00 00 88 84 24 [4] E8 [4] 31 C9 88 84 24 [4] E8 [3] FF}
$installers_1hex{B9 49 00 00 00 E8 [4] B9 6E 00 00 00 88 84 24 [4] E8 [4] B9 73 00 00 00 88 84 24 [4] E8 [3] FF}
$installers_2hex{B9 74 00 00 00 88 84 24 [4] E8 [4] B9 61 00 00 00 88 84 24 [4] E8 [4] B9 6C 00 00 00 88 84 24 [4] E8 [3] FF}
$installers_3hex{B9 6C 00 00 00 88 84 24 [4] E8 [4] B9 65 00 00 00 88 84 24 [4] E8 [3] FF}
$installers_4hex{B9 72 00 00 00 88 84 24 [4] E8 [4] B9 73 00 00 00 88 84 24 [4] E8 [3] FF}
$rc4decrypt_1hex{48 89 ?? 4? 89 ?? E8 [4] 4? 8B ?? 24 [1-4] 4? 89 ?? 4? 89 ?? 4? 89 C1 [0-1] 89 ?? E8 [4] 4? 89}
$rc4decrypt_2hex{E8 [4] 8B ?? 24 [1-4] 4? 89 ?? 48 89 ?? 4? 89 C1 E8 [3] FF}

Condition

any of ( $decrypt* ) or ( $key and ( 3 of ( $taskman_* ) or 3 of ( $installers* ) and 1 of ( $rc4decrypt_* ) ) )

In plain words (Heuristic)

  • At least one pattern in ( $decrypt* ) must match.
  • At least 3 patterns in ( $taskman_* ) must match.
  • At least 3 patterns in ( $installers* ) must match.
  • At least 1 patterns in ( $rc4decrypt_* ) must match.
  • Pattern $key must be present.

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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: 0c8d0655-0592-52b5-b51d-3acdb15a4864

Metadata

cape_optionsbp0=$decrypt1*+1,bp1=$key*,hc0=1,count=0,action0=string:rcx,action1=string:rdx,typestring=NitrogenLoader Config

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