Remote Access Tool - NetSupport Execution From Unusual Location

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

Detects execution of client32.exe (NetSupport RAT) 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:
Hashes|contains: 'IMPHASH=a9d50692e95b79723f3e76fcf70d023e'
Image|endswith: '\client32.exe'
OriginalFileName|contains: client32.exe
Product|contains: 'NetSupport Remote Control'

Stage 2: `not filter`

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

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
`Hashes`	match	`IMPHASH=a9d50692e95b79723f3e76fcf70d023e`
`Image`	ends_with	`\client32.exe` corpus 2 (sigma 2)
`Image`	starts_with	`C:\Program Files (x86)\` corpus 14 (sigma 14) `C:\Program Files\` corpus 15 (sigma 15)
`OriginalFileName`	match	`client32.exe` corpus 2 (sigma 2)
`Product`	match	`NetSupport Remote Control` corpus 2 (sigma 2)