Sigma rule: Suspicious Log Entries

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-0ba8bf2e7b15, updated 2021-11-27T00:00:00.000Z.

Rule

Title
Suspicious Log Entries
Status
test
Level
medium
Author
Florian Roth (Nextron Systems)
Date
2017-03-25
Modified
2021-11-27
File
rules/linux/builtin/lnx_shell_susp_log_entries.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious log entries in Linux log files

Log source

product
linux

Detection

keywords:
    # Generic suspicious log lines
    - 'entered promiscuous mode'
    # OSSEC https://github.com/ossec/ossec-hids/blob/master/etc/rules/syslog_rules.xml
    - 'Deactivating service'
    - 'Oversized packet received from'
    - 'imuxsock begins to drop messages'
condition: keywords

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.impact

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/lnx_shell_susp_log_entries.yml

Sources and licences

  • SigmaHQ

    "Suspicious Log Entries" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/builtin/lnx_shell_susp_log_entries.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: Suspicious Log Entries",
entity page, dataset version ref-0ba8bf2e7b15, updated 2021-11-27T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/f64b6e9a-5d9d-48a5-8289-e1dd2b3876e1 (accessed 2026-11-03).
Underlying source: SigmaHQ rule f64b6e9a-5d9d-48a5-8289-e1dd2b3876e1, 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.