Use of UltraVNC Remote Access Software

Status: test
Severity: medium
Log source: category process_creation, product windows
Author: frack113
Source: github.com/SigmaHQ/sigma

An adversary may use legitimate desktop support and remote access software,to establish an interactive command and control channel to target systems within networks

Known false positives

Legitimate use

MITRE ATT&CK coverage

Tactic	Techniques
Command & Control	`T1219.002` Remote Access Tools: Remote Desktop Software

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation

Rule body

title: Use of UltraVNC Remote Access Software
id: 145322e4-0fd3-486b-81ca-9addc75736d8
status: test
description: An adversary may use legitimate desktop support and remote access software,to establish an interactive command and control channel to target systems within networks
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/9e5b12c4912c07562aec7500447b11fa3e17e254/atomics/T1219/T1219.md
author: frack113
date: 2022-10-02
tags:
    - attack.command-and-control
    - attack.t1219.002
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        - Description: VNCViewer
        - Product: UltraVNC VNCViewer
        - Company: UltraVNC
        - OriginalFileName: VNCViewer.exe
    condition: selection
falsepositives:
    - Legitimate use
level: medium

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    - Description: VNCViewer
    - Product: UltraVNC VNCViewer
    - Company: UltraVNC
    - OriginalFileName: VNCViewer.exe

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`Company`	eq	`UltraVNC`	`field:"Company" kind:eq value:"UltraVNC"`
`Description`	eq	`VNCViewer`	`field:"Description" kind:eq value:"VNCViewer"`
`OriginalFileName`	eq	`VNCViewer.exe`	`field:"OriginalFileName" kind:eq value:"VNCViewer.exe"`
`Product`	eq	`UltraVNC VNCViewer`	`field:"Product" kind:eq value:"UltraVNC VNCViewer"`