Detection rules › Sigma
Potential Process Injection Via Msra.EXE
Detects potential process injection via Microsoft Remote Asssistance (Msra.exe) by looking at suspicious child processes spawned from the aforementioned process. It has been a target used by many threat actors and used for discovery and persistence tactics
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Privilege Escalation | T1055 Process Injection |
| Stealth | T1055 Process Injection |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
Rule body yaml
title: Potential Process Injection Via Msra.EXE
id: 744a188b-0415-4792-896f-11ddb0588dbc
status: test
description: Detects potential process injection via Microsoft Remote Asssistance (Msra.exe) by looking at suspicious child processes spawned from the aforementioned process. It has been a target used by many threat actors and used for discovery and persistence tactics
references:
- https://www.microsoft.com/security/blog/2021/12/09/a-closer-look-at-qakbots-latest-building-blocks-and-how-to-knock-them-down/
- https://www.fortinet.com/content/dam/fortinet/assets/analyst-reports/ar-qakbot.pdf
author: Alexander McDonald
date: 2022-06-24
modified: 2023-02-03
tags:
- attack.privilege-escalation
- attack.stealth
- attack.t1055
logsource:
category: process_creation
product: windows
detection:
selection:
ParentImage|endswith: '\msra.exe'
ParentCommandLine|endswith: 'msra.exe'
Image|endswith:
- '\arp.exe'
- '\cmd.exe'
- '\net.exe'
- '\netstat.exe'
- '\nslookup.exe'
- '\route.exe'
- '\schtasks.exe'
- '\whoami.exe'
condition: selection
falsepositives:
- Legitimate use of Msra.exe
level: high
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
ParentImage|endswith: '\msra.exe'
ParentCommandLine|endswith: 'msra.exe'
Image|endswith:
- '\arp.exe'
- '\cmd.exe'
- '\net.exe'
- '\netstat.exe'
- '\nslookup.exe'
- '\route.exe'
- '\schtasks.exe'
- '\whoami.exe'
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 |
|---|---|---|
Image | ends_with |
|
ParentCommandLine | ends_with |
|
ParentImage | ends_with |
|