Detection rules › Sigma
Potential CVE-2021-44228 Exploitation Attempt - VMware Horizon
Detects potential initial exploitation attempts against VMware Horizon deployments running a vulnerable versions of Log4j.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | T1190 Exploit Public-Facing Application |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
title: Potential CVE-2021-44228 Exploitation Attempt - VMware Horizon
id: 3eb91f0a-0060-424a-a676-59f5fdd75610
status: test
description: |
Detects potential initial exploitation attempts against VMware Horizon deployments running a vulnerable versions of Log4j.
references:
- https://portswigger.net/daily-swig/vmware-horizon-under-attack-as-china-based-ransomware-group-targets-log4j-vulnerability
- https://twitter.com/TheDFIRReport/status/1482078434327244805
- https://www.pwndefend.com/2022/01/07/log4shell-exploitation-and-hunting-on-vmware-horizon-cve-2021-44228/
author: '@kostastsale'
date: 2022-01-14
tags:
- attack.initial-access
- attack.t1190
- cve.2021-44228
- detection.emerging-threats
logsource:
category: process_creation
product: windows
detection:
selection:
ParentImage|endswith: '\ws_TomcatService.exe'
filter_main_shells:
Image|endswith:
- '\cmd.exe'
- '\powershell.exe'
condition: selection and not 1 of filter_main_*
falsepositives:
- Unlikely
level: high
Stages and Predicates
Stage 0: condition
selection and not 1 of filter_main_*Stage 1: selection
selection:
ParentImage|endswith: '\ws_TomcatService.exe'
Stage 2: not filter_main_shells
filter_main_shells:
Image|endswith:
- '\cmd.exe'
- '\powershell.exe'
Exclusions
Top-level NOT(...) conjuncts: predicates this rule actively suppresses.
| Field | Kind | Excluded values |
|---|---|---|
Image | ends_with | \cmd.exe |
Image | ends_with | \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.
| Field | Kind | Values |
|---|---|---|
ParentImage | ends_with |
|