Remote Access Tool - RURAT Execution From Unusual Location

Hunt Hypothesis

Detects execution of Remote Utilities RAT (RURAT) from an unusual location (outside of ‘C:\Program Files’)

Detection Rule

Sigma (Original)

title: Remote Access Tool - RURAT Execution From Unusual Location
id: e01fa958-6893-41d4-ae03-182477c5e77d
status: test
description: Detects execution of Remote Utilities RAT (RURAT) from an unusual location (outside of 'C:\Program Files')
references:
    - https://redcanary.com/blog/misbehaving-rats/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-09-19
modified: 2023-03-05
tags:
    - attack.stealth
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        - Image|endswith:
              - '\rutserv.exe'
              - '\rfusclient.exe'
        - Product: 'Remote Utilities'
    filter:
        Image|startswith:
            - 'C:\Program Files\Remote Utilities'
            - 'C:\Program Files (x86)\Remote Utilities'
    condition: selection and not filter
falsepositives:
    - Unknown
level: medium

KQL (Azure Sentinel)

imProcessCreate
| where ((TargetProcessName endswith "\\rutserv.exe" or TargetProcessName endswith "\\rfusclient.exe") or TargetProcessFileProduct =~ "Remote Utilities") and (not((TargetProcessName startswith "C:\\Program Files\\Remote Utilities" or TargetProcessName startswith "C:\\Program Files (x86)\\Remote Utilities")))

Required Data Sources

False Positive Guidance

• Unknown

References

• https://redcanary.com/blog/misbehaving-rats/
• SigmaHQ Rule