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Detection rules › Sigma

Potential CVE-2023-36884 Exploitation Pattern

Status
test
Severity
critical
Log source
category proxy
Author
X__Junior
Source
github.com/SigmaHQ/sigma

Detects a unique pattern seen being used by RomCom potentially exploiting CVE-2023-36884

MITRE ATT&CK coverage

TacticTechniques
Command & ControlNo specific technique

Rule body yaml

title: Potential CVE-2023-36884 Exploitation Pattern
id: 0066d244-c277-4c3e-88ec-9e7b777cc8bc
status: test
description: Detects a unique pattern seen being used by RomCom potentially exploiting CVE-2023-36884
references:
    - https://blogs.blackberry.com/en/2023/07/romcom-targets-ukraine-nato-membership-talks-at-nato-summit
author: X__Junior
date: 2023-07-12
tags:
    - attack.command-and-control
    - cve.2023-36884
    - detection.emerging-threats
logsource:
    category: proxy
detection:
    selection:
        cs-method: 'GET'
        c-uri|contains: '/MSHTML_C7/'
        c-uri|re: '\?d=[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
    condition: selection
falsepositives:
    - Unknown
level: critical

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    cs-method: 'GET'
    c-uri|contains: '/MSHTML_C7/'
    c-uri|re: '\?d=[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'

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
c-urimatch
  • /MSHTML_C7/
c-uriregex_match
  • ?d=[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}
cs-methodeq
  • GET