Sigma rule: Multiple Modsecurity Blocks

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-62ec64df1981, updated 2023-03-24T00:00:00.000Z.

Rule

Title
Multiple Modsecurity Blocks
Status
unsupported
Level
medium
Author
Florian Roth (Nextron Systems)
Date
2017/02/28
Modified
2023/03/24
File
unsupported/other/modsec_mulitple_blocks.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects multiple blocks by the mod_security module (Web Application Firewall)

Log source

product
modsecurity

Detection

selection:
    - 'mod_security: Access denied'
    - 'ModSecurity: Access denied'
    - 'mod_security-message: Access denied'
timeframe: 120m
condition: selection | count() > 6

False positives (as the rule lists them)

  • Vulnerability scanners
  • Frequent attacks if system faces Internet

Tags

  • attack.impact
  • attack.t1499

MITRE ATT&CK ids this rule names

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/unsupported/other/modsec_mulitple_blocks.yml

Sources and licences

  • SigmaHQ

    "Multiple Modsecurity Blocks" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/unsupported/other/modsec_mulitple_blocks.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: Multiple Modsecurity Blocks",
entity page, dataset version ref-62ec64df1981, updated 2023-03-24T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/a06eea10-d932-4aa6-8ba9-186df72c8d23 (accessed 2026-11-03).
Underlying source: SigmaHQ rule a06eea10-d932-4aa6-8ba9-186df72c8d23, 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.