Detection rules › Sigma
ZxShell Malware
Detects a ZxShell start by the called and well-known function name
Known false positives
- Unlikely
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | |
| Stealth |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 1: Process creation |
| Security-Auditing | Event ID 4688: A new process has been created. |
Rule body
title: ZxShell Malware
id: f0b70adb-0075-43b0-9745-e82a1c608fcc
status: test
description: Detects a ZxShell start by the called and well-known function name
references:
- https://www.hybrid-analysis.com/sample/5d2a4cde9fa7c2fdbf39b2e2ffd23378d0c50701a3095d1e91e3cf922d7b0b16?environmentId=100
- https://pub-7cb8ac806c1b4c4383e585c474a24719.r2.dev/116309e7121bc8b0e66e4166c06f7b818e1d3629.pdf
author: Florian Roth (Nextron Systems), oscd.community, Jonhnathan Ribeiro
date: 2017-07-20
modified: 2021-11-27
tags:
- attack.execution
- attack.stealth
- attack.t1059.003
- attack.t1218.011
- attack.s0412
- attack.g0001
- detection.emerging-threats
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith: '\rundll32.exe'
CommandLine|contains:
- 'zxFunction'
- 'RemoteDiskXXXXX'
condition: selection
falsepositives:
- Unlikely
level: critical
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
Image|endswith: '\rundll32.exe'
CommandLine|contains:
- 'zxFunction'
- 'RemoteDiskXXXXX'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
CommandLine | match |
| field:"CommandLine" kind:match |
Image | ends_with |
| field:"Image" kind:ends_with value:"\rundll32.exe" |