atomic-threat-coverage/Atomic_Threat_Coverage/Detection_Rules/win_apt_cloudhopper.md

Title	WMIExec VBS Script
Description	Detects suspicious file execution by wscript and cscript
ATT&CK Tactic	TA0002: Execution
ATT&CK Technique	T1064: Scripting T1059.005: Visual Basic
Data Needed	DN_0002_4688_windows_process_creation_with_commandline DN_0003_1_windows_sysmon_process_creation
Trigger	T1059.005: Visual Basic
Severity Level	critical
False Positives	Unlikely
Development Status	Development Status wasn't defined for this Detection Rule yet
References	https://www.pwc.co.uk/cyber-security/pdf/cloud-hopper-annex-b-final.pdf
Author	Florian Roth
Other Tags	attack.g0045

Detection Rules

Sigma rule

title: WMIExec VBS Script
id: 966e4016-627f-44f7-8341-f394905c361f
description: Detects suspicious file execution by wscript and cscript
author: Florian Roth
date: 2017/04/07
references:
    - https://www.pwc.co.uk/cyber-security/pdf/cloud-hopper-annex-b-final.pdf
tags:
    - attack.execution
    - attack.g0045
    - attack.t1064 # an old one
    - attack.t1059.005
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image: '*\cscript.exe'
        CommandLine: '*.vbs /shell *'
    condition: selection
fields:
    - CommandLine
    - ParentCommandLine
falsepositives:
    - Unlikely
level: critical

powershell

Get-WinEvent | where {($_.message -match "Image.*.*\\\\cscript.exe" -and $_.message -match "CommandLine.*.*.vbs /shell .*") } | select TimeCreated,Id,RecordId,ProcessId,MachineName,Message

es-qs

(winlog.event_data.Image.keyword:*\\\\cscript.exe AND winlog.event_data.CommandLine.keyword:*.vbs\\ \\/shell\\ *)

xpack-watcher

curl -s -XPUT -H \'Content-Type: application/json\' --data-binary @- localhost:9200/_watcher/watch/966e4016-627f-44f7-8341-f394905c361f <<EOF\n{\n  "metadata": {\n    "title": "WMIExec VBS Script",\n    "description": "Detects suspicious file execution by wscript and cscript",\n    "tags": [\n      "attack.execution",\n      "attack.g0045",\n      "attack.t1064",\n      "attack.t1059.005"\n    ],\n    "query": "(winlog.event_data.Image.keyword:*\\\\\\\\cscript.exe AND winlog.event_data.CommandLine.keyword:*.vbs\\\\ \\\\/shell\\\\ *)"\n  },\n  "trigger": {\n    "schedule": {\n      "interval": "30m"\n    }\n  },\n  "input": {\n    "search": {\n      "request": {\n        "body": {\n          "size": 0,\n          "query": {\n            "bool": {\n              "must": [\n                {\n                  "query_string": {\n                    "query": "(winlog.event_data.Image.keyword:*\\\\\\\\cscript.exe AND winlog.event_data.CommandLine.keyword:*.vbs\\\\ \\\\/shell\\\\ *)",\n                    "analyze_wildcard": true\n                  }\n                }\n              ],\n              "filter": {\n                "range": {\n                  "timestamp": {\n                    "gte": "now-30m/m"\n                  }\n                }\n              }\n            }\n          }\n        },\n        "indices": [\n          "winlogbeat-*"\n        ]\n      }\n    }\n  },\n  "condition": {\n    "compare": {\n      "ctx.payload.hits.total": {\n        "not_eq": 0\n      }\n    }\n  },\n  "actions": {\n    "send_email": {\n      "throttle_period": "15m",\n      "email": {\n        "profile": "standard",\n        "from": "root@localhost",\n        "to": "root@localhost",\n        "subject": "Sigma Rule \'WMIExec VBS Script\'",\n        "body": "Hits:\\n{{#ctx.payload.hits.hits}}Hit on {{_source.@timestamp}}:\\n      CommandLine = {{_source.CommandLine}}\\nParentCommandLine = {{_source.ParentCommandLine}}================================================================================\\n{{/ctx.payload.hits.hits}}",\n        "attachments": {\n          "data.json": {\n            "data": {\n              "format": "json"\n            }\n          }\n        }\n      }\n    }\n  }\n}\nEOF\n

graylog

(Image.keyword:*\\\\cscript.exe AND CommandLine.keyword:*.vbs \\/shell *)

splunk

(Image="*\\\\cscript.exe" CommandLine="*.vbs /shell *") | table CommandLine,ParentCommandLine

logpoint

(Image="*\\\\cscript.exe" CommandLine="*.vbs /shell *")

grep

grep -P '^(?:.*(?=.*.*\\cscript\\.exe)(?=.*.*\\.vbs /shell .*))'