Remote Access Tool - AnyDesk Incoming Connection

Hunt Hypothesis

Detects incoming connections to AnyDesk. This could indicate a potential remote attacker trying to connect to a listening instance of AnyDesk and use it as potential command and control channel.

Detection Rule

Sigma (Original)

title: Remote Access Tool - AnyDesk Incoming Connection
id: d58ba5c6-0ed7-4b9d-a433-6878379efda9
status: experimental
description: |
    Detects incoming connections to AnyDesk. This could indicate a potential remote attacker trying to connect to a listening instance of AnyDesk and use it as potential command and control channel.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1219/T1219.md#atomic-test-2---anydesk-files-detected-test-on-windows
    - https://asec.ahnlab.com/en/40263/
author: '@d4ns4n_ (Wuerth-Phoenix)'
date: 2024-09-02
modified: 2025-02-24
tags:
    - attack.persistence
    - attack.command-and-control
    - attack.t1219.002
logsource:
    category: network_connection
    product: windows
detection:
    selection:
        Image|endswith:
            - '\AnyDesk.exe'
            - '\AnyDeskMSI.exe'
        Initiated: 'false' # If the network connection is initiated remotely (incoming), the field is set to false.
    condition: selection
falsepositives:
    - Legitimate incoming connections (e.g. sysadmin activity). Most of the time I would expect outgoing connections (initiated locally).
level: medium

KQL (Azure Sentinel)

imNetworkSession
| where ((SrcProcessName endswith "\\AnyDesk.exe" or SrcProcessName endswith "\\AnyDeskMSI.exe") or (DstProcessName endswith "\\AnyDesk.exe" or DstProcessName endswith "\\AnyDeskMSI.exe")) and NetworkDirection =~ "false"

Required Data Sources

False Positive Guidance

• Legitimate incoming connections (e.g. sysadmin activity). Most of the time I would expect outgoing connections (initiated locally).

MITRE ATT&CK Context

• Tactic: Persistence
• Tactic: Command and Control
• Technique: T1219.002 — T1219.002

References

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1219/T1219.md#atomic-test-2---anydesk-files-detected-test-on-windows
• https://asec.ahnlab.com/en/40263/
• SigmaHQ Rule