Potential Atlassian Confluence CVE-2021-26084 Exploitation Attempt

title: Potential Atlassian Confluence CVE-2021-26084 Exploitation Attempt
id: 245f92e3-c4da-45f1-9070-bc552e06db11
status: test
description: Detects spawning of suspicious child processes by Atlassian Confluence server which may indicate successful exploitation of CVE-2021-26084
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2021-26084
    - https://confluence.atlassian.com/doc/confluence-security-advisory-2021-08-25-1077906215.html
    - https://github.com/h3v0x/CVE-2021-26084_Confluence
author: Bhabesh Raj
date: 2021-09-08
modified: 2023-02-13
tags:
    - attack.initial-access
    - attack.execution
    - attack.t1190
    - attack.t1059
    - cve.2021-26084
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        # Monitor suspicious child processes spawned by Confluence
        ParentImage|endswith: '\Atlassian\Confluence\jre\bin\java.exe'
        CommandLine|contains:
            - 'certutil'
            - 'cmd /c'
            - 'cmd /k'
            - 'cscript'
            - 'curl'
            - 'ipconfig'
            - 'powershell'
            - 'pwsh'
            - 'regsvr32'
            - 'rundll32'
            - 'whoami'
            - 'wscript'
    condition: selection
falsepositives:
    - Unknown
level: high