YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_SUSP_Sysinternals_Desktops_Anomaly_Feb25

Detects anomalies in Sysinternals Desktops binaries

Suspicious / huntingSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X

Author: Florian Roth
Date: 2025-02-14
Modified: 2025-03-20
Score / Quality: 70 / 85

What this rule detects

Detects anomalies in Sysinternals Desktops binaries

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

susp-sysinternals-desktops-anomaly-feb25.yarDetection Rule License 1.1

rule SIGNATURE_BASE_SUSP_Sysinternals_Desktops_Anomaly_Feb25 : FILE
{
	meta:
		description = "Detects anomalies in Sysinternals Desktops binaries"
		author = "Florian Roth"
		id = "5a586222-9263-5079-be48-9cfa464440d4"
		date = "2025-02-14"
		modified = "2025-03-20"
		reference = "Internal Research"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/mal_phish_feb25.yar#L37-L60"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "5b8f64e090c7c9012e656c222682dfae7910669c7b7afaca35829cd1cc2eac17"
		hash = "d0f7f3f58e0dfcfd81235379bb5a236f40be490207d3bf45f190a264879090db"
		hash = "a83dc4d69a3de72aed4d1933db2ca120657f06adc6683346afbd267b8b7d27d0"
		hash = "9ebfe694914d337304edded8b6406bd3fbff1d4ee110ef3a8bf95c3fb5de7c38"
		hash = "9a5b9d89686de129a7b1970d5804f0f174156143ccfcd2cf669451c1ad4ab97e"
		hash = "ff82c4c679c5486aed2d66a802682245a1e9cd7d6ceb65fa0e7b222f902998e8"
		hash = "1da91d2570329f9e214f51bc633283f10bd55a145b7b3d254e03175fd86292d9"
		logic_hash = "e17b831c9644cfe6a4c82537a01cb937007308d94eb2b78f97f5fbad3546404a"
		score = 70
		quality = 85
		tags = "FILE"

	strings:
		$s1 = "Software\\Sysinternals\\Desktops" wide fullword
		$s2 = "Sysinternals Desktops" wide fullword
		$s3 = "http://www.sysinternals.com" wide fullword

	condition:
		uint16( 0 ) == 0x5a4d and filesize > 350KB and all of them
}

Strings (3 patterns)

Identifier	Type	Value	Modifiers
$s1	text	"Software\\Sysinternals\\Desktops"	wide fullword
$s2	text	"Sysinternals Desktops"	wide fullword
$s3	text	"http://www.sysinternals.com"	wide fullword

Condition

uint16( 0 ) == 0x5a4d and filesize > 350KB and all of them

In plain words (Heuristic)

The file must start with “MZ” — a Windows executable (PE).
The file must be larger than 350KB.
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

Sample hashes

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

5b8f64e090c7c9012e656c222682dfae7910669c7b7afaca35829cd1cc2eac17
d0f7f3f58e0dfcfd81235379bb5a236f40be490207d3bf45f190a264879090db
a83dc4d69a3de72aed4d1933db2ca120657f06adc6683346afbd267b8b7d27d0
9ebfe694914d337304edded8b6406bd3fbff1d4ee110ef3a8bf95c3fb5de7c38
9a5b9d89686de129a7b1970d5804f0f174156143ccfcd2cf669451c1ad4ab97e
ff82c4c679c5486aed2d66a802682245a1e9cd7d6ceb65fa0e7b222f902998e8
1da91d2570329f9e214f51bc633283f10bd55a145b7b3d254e03175fd86292d9

Licence & attribution

Author: Florian Roth

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: 5a586222-9263-5079-be48-9cfa464440d4

Tags:FILE

SIGNATURE_BASE_SUSP_Command_Line_Combos_Feb24_2
Suspicious / huntingSignature Base (Florian Roth / Nextron)· Florian Roth· 2024-02-23
SIGNATURE_BASE_SUSP_MAL_Signingcert_Feb24_1
Suspicious / huntingSignature Base (Florian Roth / Nextron)· Florian Roth· 2024-02-23
SIGNATURE_BASE_SUSP_RDP_File_Indicators_Oct24_1
Suspicious / huntingSignature Base (Florian Roth / Nextron)· Florian Roth· 2024-10-25
SIGNATURE_BASE_SUSP_Screenconnect_User_Poc_Com_Used_Feb24
Suspicious / huntingSignature Base (Florian Roth / Nextron)· Florian Roth· 2024-02-23
SIGNATURE_BASE_SUSP_Esxiargs_Endpoint_Conf_Aug23
Suspicious / huntingSignature Base (Florian Roth / Nextron)· Florian Roth· 2023-08-04
SIGNATURE_BASE_SUSP_Screenconnect_Exploitation_Artefacts_Feb24
Suspicious / huntingSignature Base (Florian Roth / Nextron)· Florian Roth· 2024-02-23
SIGNATURE_BASE_SUSP_JAVA_Loader_Indicators_Aug25
Suspicious / huntingSignature Base (Florian Roth / Nextron)· Florian Roth· 2025-08-07
SIGNATURE_BASE_SUSP_BAT_OBFUSC_Jul24_1
Suspicious / huntingSignature Base (Florian Roth / Nextron)· Florian Roth· 2024-07-12