Convert indexed Sigma rules into analyst-ready detections.

title: Potential Exploitation of CVE-2025-4427/4428 Ivanti EPMM Pre-Auth RCE
id: 41956f7c-7a6b-46d6-b6bb-da6eb2e83fbe
status: experimental
description: |
    Detects potential exploitation of a chained vulnerability attack targeting Ivanti EPMM 12.5.0.0.
    CVE-2025-4427 allows unauthenticated access to protected API endpoints via an authentication bypass,
    which can then be leveraged to trigger CVE-2025-4428 — a remote code execution vulnerability through
    template injection. This sequence enables unauthenticated remote code execution, significantly increasing
    the impact of exploitation.
references:
    - https://labs.watchtowr.com/expression-payloads-meet-mayhem-cve-2025-4427-and-cve-2025-4428/?123
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-05-20
tags:
    - attack.initial-access
    - attack.t1190
    - attack.execution
    - attack.t1203
    - cve.2025-4427
    - cve.2025-4428
    - detection.emerging-threats
logsource:
    category: webserver
detection:
    selection_uri:
        cs-uri-stem|contains: '/mifs/rs/api/v2/featureusage'
        cs-uri-query|contains: 'format='
    selection_exploit_rce:
        - cs-uri-query|contains|all:
              - 'java.lang.Runtime'
              - '.getMethod'
              - 'getRuntime'
              - '.exec('
        - cs-uri-query|contains|all:
              - 'java%2elang%2eRuntime' # java.lang.Runtime
              - '%2egetMethod' # .getMethod
              - '%2eexec%28' # .exec(
        - cs-uri-query|contains:
              - '%6a%61%76%61%2e%6c%61%6e%67%2e%52%75%6e%74%69%6d%65%65%28%29' # java.lang.Runtime
              - '%67%65%74%52%75%6e%74%69%6d%65' # getRuntime
              - '%2e%65%78%65%63%28' # .exec(
    selection_exploit_template_injection:
        cs-uri-query|contains:
            - '{7*7}'
            - '%7B7*7%7D'
            - '%7b7%2a7%7d'
    condition: selection_uri and 1 of selection_exploit_*
falsepositives:
    - Unknown
level: high