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Detection rules › Sigma

CVE-2023-22518 Exploitation Attempt - Suspicious Confluence Child Process (Windows)

Status
test
Severity
medium
Log source
product windows, category process_creation
Author
Andreas Braathen (mnemonic.io)
Source
github.com/SigmaHQ/sigma

Detects exploitation attempt of CVE-2023-22518 (Confluence Data Center / Confluence Server), where an attacker can exploit vulnerable endpoints to e.g. create admin accounts and execute arbitrary commands.

MITRE ATT&CK coverage

TacticTechniques
Initial AccessT1190 Exploit Public-Facing Application
ExecutionT1059 Command and Scripting Interpreter

Event coverage

ProviderEventTitle
SysmonEvent ID 1Process creation

Rule body yaml

title: CVE-2023-22518 Exploitation Attempt - Suspicious Confluence Child Process (Windows)
id: 1ddaa9a4-eb0b-4398-a9fe-7b018f9e23db
related:
    - id: f8987c03-4290-4c96-870f-55e75ee377f4
      type: similar
status: test
description: |
    Detects exploitation attempt of CVE-2023-22518 (Confluence Data Center / Confluence Server), where an attacker can exploit vulnerable endpoints to e.g. create admin accounts and execute arbitrary commands.
references:
    - https://confluence.atlassian.com/security/cve-2023-22518-improper-authorization-vulnerability-in-confluence-data-center-and-server-1311473907.html
    - https://www.huntress.com/blog/confluence-to-cerber-exploitation-of-cve-2023-22518-for-ransomware-deployment
    - https://github.com/ForceFledgling/CVE-2023-22518
author: Andreas Braathen (mnemonic.io)
date: 2023-11-14
tags:
    - attack.execution
    - attack.t1059
    - attack.initial-access
    - attack.t1190
    - cve.2023-22518
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection_parent:
        ParentImage|endswith:
            - '\tomcat8.exe'
            - '\tomcat9.exe'
            - '\tomcat10.exe'
        ParentCommandLine|contains: 'confluence'
    selection_child:
        # Note: Only children associated with known campaigns
        - Image|endswith:
              - '\cmd.exe'
              - '\powershell.exe'
        - OriginalFileName:
              - 'Cmd.Exe'
              - 'PowerShell.EXE'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: condition

all of selection_*

Stage 1: selection_parent

selection_parent:
    ParentImage|endswith:
        - '\tomcat8.exe'
        - '\tomcat9.exe'
        - '\tomcat10.exe'
    ParentCommandLine|contains: 'confluence'

Stage 2: selection_child

selection_child:
    - Image|endswith:
          - '\cmd.exe'
          - '\powershell.exe'
    - OriginalFileName:
          - 'Cmd.Exe'
          - 'PowerShell.EXE'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
Imageends_with
  • \cmd.exe corpus 130 (sigma 130)
  • \powershell.exe corpus 182 (sigma 182)
OriginalFileNameeq
  • Cmd.Exe corpus 65 (sigma 43, splunk 17, elastic 5)
  • PowerShell.EXE corpus 120 (sigma 84, splunk 30, elastic 6)
ParentCommandLinematch
  • confluence corpus 2 (sigma 2)
ParentImageends_with
  • \tomcat10.exe
  • \tomcat8.exe
  • \tomcat9.exe