Sigma rule: Suspicious Binary Writes Via AnyDesk

Rule

Title

Suspicious Binary Writes Via AnyDesk

Status

test

Level

high

Author

Nasreddine Bencherchali (Nextron Systems)

Date

2022-09-28

Modified

2025-02-24

File

rules/windows/file/file_event/file_event_win_anydesk_writing_susp_binaries.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects AnyDesk writing binary files to disk other than "gcapi.dll".
According to RedCanary research it is highly abnormal for AnyDesk to write executable files to disk besides gcapi.dll,
which is a legitimate DLL that is part of the Google Chrome web browser used to interact with the Google Cloud API. (See reference section for more details)

Log source

product

windows

category

file_event

Detection

selection:
    Image|endswith:
        - '\AnyDesk.exe'
        - '\AnyDeskMSI.exe'
    TargetFilename|endswith:
        - '.dll'
        - '.exe'
filter_dlls:
    TargetFilename|endswith: '\gcapi.dll'
condition: selection and not 1 of filter_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.command-and-control
• attack.t1219.002

MITRE ATT&CK ids this rule names

• T1219.002

References

• https://redcanary.com/blog/misbehaving-rats/
• https://thedfirreport.com/2025/02/24/confluence-exploit-leads-to-lockbit-ransomware/

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/file/file_event/file_event_win_anydesk_writing_susp_binaries.yml