1200KM / sigma-rule

F5 BIG-IP iControl Rest API Command Execution - Webserver — Sigma Rule

Sigma rule 85254a62-22be-4239-b79c-2ec17e566c37. F5 BIG-IP iControl Rest API Command Execution - Webserver — Sigma Rule. Detects POST requests to the F5 BIG-IP iControl Rest API "bash" endpoint, which allows the execution of commands on the BIG-IP

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems), Thurein Oo. Source status: test; severity: medium. Source dates: 2023-11-08 / not supplied.

{
  "category": "webserver"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: f5ac1183c9197251de489417f35b5a7940eb38ab86666c4d689bc6cff935f088

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: F5 BIG-IP iControl Rest API Command Execution - Webserver
id: 85254a62-22be-4239-b79c-2ec17e566c37
related:
    - id: b59c98c6-95e8-4d65-93ee-f594dfb96b17
      type: similar
status: test
description: Detects POST requests to the F5 BIG-IP iControl Rest API "bash" endpoint, which allows the execution of commands on the BIG-IP
references:
    - https://f5-sdk.readthedocs.io/en/latest/apidoc/f5.bigip.tm.util.html#module-f5.bigip.tm.util.bash
    - https://community.f5.com/t5/technical-forum/icontrolrest-11-5-execute-bash-command/td-p/203029
    - https://community.f5.com/t5/technical-forum/running-bash-commands-via-rest-api/td-p/272516
author: Nasreddine Bencherchali (Nextron Systems), Thurein Oo
date: 2023-11-08
tags:
    - attack.execution
    - attack.t1190
    - attack.initial-access
logsource:
    category: webserver
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|endswith: '/mgmt/tm/util/bash'
    condition: selection
falsepositives:
    - Legitimate usage of the BIG IP REST API to execute command for administration purposes
level: medium

Original YAML and metadata in JSON

False positives

Legitimate usage of the BIG IP REST API to execute command for administration purposes

Source references

Connected ecosystem references

Exact source-tagged techniques

T1190 · Exploit Public-Facing Application · Detection rules & anomalies

Telemetry review

Read the original logsource above, then inspect the linked detection workspaces for technique-level sensor context. No per-rule telemetry equivalence is inferred.

Pinned research references. No browser attack runner, live simulation result or validated detector is asserted. Source mappings and validation limits are preserved. ATT&CK / Atomic provenance · Detection provenance.