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DITEKSHEN_INDICATOR_RMM_Meshagent_CERT

Detects Mesh Agent by (default) certificate. Review RMM Inventory

Suspicious / huntingditekSHen detectionBSD 2-Clause LicenseCompiles with YARA-X (with warnings)
Author
ditekSHen
Date
2023-08-22
Modified
2024-10-04
Score / Quality
75 / 75

What this rule detects

Detects Mesh Agent by (default) certificate. Review RMM Inventory

Targets: Windows PE.

It has no patterns: the condition alone decides (modules, file properties or other rules). YARA modules used: pe.

YARA-X says: warning[deprecated_field]: field `number_of_signatures` is deprecated

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

Includes the imports needed to compile it on its own.

indicator-rmm-meshagent-cert.yarBSD 2-Clause License
import "pe"

rule DITEKSHEN_INDICATOR_RMM_Meshagent_CERT : FILE
{
	meta:
		description = "Detects Mesh Agent by (default) certificate. Review RMM Inventory"
		author = "ditekSHen"
		id = "b4b52faa-53a5-5ecf-bff8-984994449ee0"
		date = "2023-08-22"
		modified = "2024-10-04"
		reference = "https://www.cisa.gov/sites/default/files/2023-08/JCDC_RMM_Cyber_Defense_Plan_TLP_CLEAR_508c_1.pdf"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/indicator_rmm.yar#L29-L42"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "d8ac3aec723a87146be99aefbde5642d095d8d41f69c6f5e9981c39104790d33"
		score = 75
		quality = 75
		tags = "FILE"

	condition:
		uint16( 0 ) == 0x5a4d and for any i in ( 0 .. pe.number_of_signatures ) : ( pe.signatures [ i ] . issuer contains "MeshCentralRoot-" )
}

Condition

uint16( 0 ) == 0x5a4d and for any i in ( 0 .. pe.number_of_signatures ) : ( pe.signatures [ i ] . issuer contains "MeshCentralRoot-" )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • A for-loop checks a property over several matches or items.
  • Uses the pe module.
  • Checks the Authenticode signature.

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References

Licence & attribution

Author: ditekSHen

Source repository: ditekSHen detection @ e76c93dcde

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright 2021 by ditekSHen (https://github.com/ditekshen/detection).

Original rule

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

Rule id: b4b52faa-53a5-5ecf-bff8-984994449ee0

Tags:FILE

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