Sigma rule: Guacamole Two Users Sharing Session Anomaly

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-a05d5b17154f, updated 2021-11-27T00:00:00.000Z.

Rule

Title
Guacamole Two Users Sharing Session Anomaly
Status
test
Level
high
Author
Florian Roth (Nextron Systems)
Date
2020-07-03
Modified
2021-11-27
File
rules/linux/builtin/guacamole/lnx_guacamole_susp_guacamole.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious session with two users present

Log source

product
linux
service
guacamole

Detection

selection:
    - '(2 users now present)'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.credential-access
  • attack.t1212

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/builtin/guacamole/lnx_guacamole_susp_guacamole.yml

Sources and licences

  • SigmaHQ

    "Guacamole Two Users Sharing Session Anomaly" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/builtin/guacamole/lnx_guacamole_susp_guacamole.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Guacamole Two Users Sharing Session Anomaly",
entity page, dataset version ref-a05d5b17154f, updated 2021-11-27T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/1edd77db-0669-4fef-9598-165bda82826d (accessed 2026-11-03).
Underlying source: SigmaHQ rule 1edd77db-0669-4fef-9598-165bda82826d, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.