Detection rules › Sigma
Suspicious Digital Signature Of AppX Package
Detects execution of AppX packages with known suspicious or malicious signature
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | No specific technique |
| Stealth | No specific technique |
Event coverage
| Provider | Event | Title |
|---|---|---|
| AppxPackagingOM | Event ID 157 | The app package signature was validated for core content of the app package published by subjectName. |
Rule body yaml
title: Suspicious Digital Signature Of AppX Package
id: b5aa7d60-c17e-4538-97de-09029d6cd76b
status: test
description: Detects execution of AppX packages with known suspicious or malicious signature
references:
- Internal Research
- https://www.sentinelone.com/labs/inside-malicious-windows-apps-for-malware-deployment/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-01-16
tags:
- attack.execution
- attack.stealth
logsource:
product: windows
service: appxpackaging-om
detection:
selection:
EventID: 157
# Add more known suspicious/malicious certificates used in different attacks
subjectName: 'CN=Foresee Consulting Inc., O=Foresee Consulting Inc., L=North York, S=Ontario, C=CA, SERIALNUMBER=1004913-1, OID.1.3.6.1.4.1.311.60.2.1.3=CA, OID.2.5.4.15=Private Organization'
condition: selection
falsepositives:
- Unknown
level: medium
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
EventID: 157
subjectName: 'CN=Foresee Consulting Inc., O=Foresee Consulting Inc., L=North York, S=Ontario, C=CA, SERIALNUMBER=1004913-1, OID.1.3.6.1.4.1.311.60.2.1.3=CA, OID.2.5.4.15=Private Organization'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
subjectName | eq |
|