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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_SUSP_PE_Contains_Encrypted_Executable_May26

Detects executables containing an encrypted embedded payload using parameters commonly observed in malware, suggesting obfuscation or staged execution.

Suspicious / huntingSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Jonathan Peters (Nextron Systems)
Date
2026-05-20
Modified
2026-06-01
Score / Quality
70 / 85

What this rule detects

Detects executables containing an encrypted embedded payload using parameters commonly observed in malware, suggesting obfuscation or staged execution.

Targets: Windows PE.

It defines 1 patterns (0 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
susp-pe-contains-encrypted-executable-may26.yarDetection Rule License 1.1
rule SIGNATURE_BASE_SUSP_PE_Contains_Encrypted_Executable_May26 : FILE
{
	meta:
		description = "Detects executables containing an encrypted embedded payload using parameters commonly observed in malware, suggesting obfuscation or staged execution."
		author = "Jonathan Peters (Nextron Systems)"
		id = "b8882ad2-e85f-5407-9bfc-a00b86dfe817"
		date = "2026-05-20"
		modified = "2026-06-01"
		reference = "https://www.nextron-systems.com/2026/06/01/detecting-nimbus-manticore-and-their-sideloading-infection-chains/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/susp_generic_rules_may26.yar#L22-L36"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "eee657ffdb2af8ed6412221e7d5fbf4f5742f2ac2c88f43f12db46af0697de71"
		logic_hash = "9fa6d5b569e28fa020d757fdbb4ae97a80d1ba54ee6a78d5bacb981adf044e88"
		score = 70
		quality = 85
		tags = "FILE"

	strings:
		$op = { ae b6 8d 86 71 f0 a9 c8 90 66 53 31 ef 7f 1f d2 b4 a8 21 bc 39 77 c2 c2 60 db 24 4a 12 32 f9 69 09 09 46 22 a6 d1 0a 5e a7 dc 62 fa 96 56 ad dd }

	condition:
		uint16( 0 ) == 0x5a4d and 1 of them
}

Strings (1 patterns)

IdentifierTypeValueModifiers
$ophex{ ae b6 8d 86 71 f0 a9 c8 90 66 53 31 ef 7f 1f d2 b4 a8 21 bc 39 77 c2 c2 60 db 24 4a 12 32 f9 69 09 09 46 22 a6 d1 0a 5e a7 dc 62 fa 96 56 ad dd }

Condition

uint16( 0 ) == 0x5a4d and 1 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 1 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).

  • eee657ffdb2af8ed6412221e7d5fbf4f5742f2ac2c88f43f12db46af0697de71

Licence & attribution

Author: Jonathan Peters (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: b8882ad2-e85f-5407-9bfc-a00b86dfe817

Tags:FILE

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