Remote Access Tool - RURAT Execution From Unusual Location

Severity: medium
Author: Nasreddine Bencherchali (Nextron Systems)
Source: upstream

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

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `selection`

or:
Image|endswith: '\rfusclient.exe'
Image|endswith: '\rutserv.exe'
Product: 'Remote Utilities'

Stage 2: `not filter`

or:
Image|startswith: 'C:\Program Files (x86)\Remote Utilities'
Image|startswith: 'C:\Program Files\Remote Utilities'

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	`\rfusclient.exe` corpus 2 (sigma 2) `\rutserv.exe` corpus 2 (sigma 2)
`Image`	starts_with	`C:\Program Files (x86)\Remote Utilities` `C:\Program Files\Remote Utilities`
`Product`	eq	`Remote Utilities` corpus 2 (sigma 2)