Detection rules › Splunk
Security Software Discovery via WMI (PowerShell)
Adversaries may attempt to get a listing of security software, configurations, defensive tools, and sensors that are installed on a system or in a cloud environment. This may include things such as firewall rules and anti-virus. Adversaries may use the information from Security Software Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions. This use case detects enumeration commands for antivirus software using WMI. Atomics Test T1518.001 Test #6
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Discovery | T1518.001 Software Discovery: Security Software Discovery |
References
Event coverage
| Provider | Event | Title |
|---|---|---|
| PowerShell | Event ID 4103 | Payload Context: ContextInfo User Data: UserData. |
| PowerShell | Event ID 4104 | Creating Scriptblock text (MessageNumber of MessageTotal). |
Rule body yaml
id: '14971.22212'
title: Security Software Discovery via WMI
description: 'Adversaries may attempt to get a listing of security software, configurations,
defensive tools, and sensors that are installed on a system or in a cloud environment.
This may include things such as firewall rules and anti-virus. Adversaries may use
the information from Security Software Discovery during automated discovery to shape
follow-on behaviors, including whether or not the adversary fully infects the target
and/or attempts specific actions. This use case detects enumeration commands for
antivirus software using WMI. Atomics Test T1518.001 Test #6'
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_powershell` (TERM(EventCode=4103) OR
"<EventID>4103<" OR TERM(EventCode=4104) OR "<EventID>4104<") TERM(wmic) TERM(AntiVirusProduct)
| table _time, host, user, process, process_*, parent_process, parent_process_*,
user| regex process="(?i)\s+AntiVirusProduct\s+" | bin span=1s | stats values(*)
as * by _time, host '
techniques:
- discovery:software discovery:security software discovery
technique_id:
- T1518.001
data_category:
- PowerShell logs
- Process command-line parameters
references:
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1518.001/T1518.001.md#atomic-test-6---security-software-discovery---av-discovery-via-wmi
Stages and Predicates
Stage 1: search
`get_endpoint_data` `get_endpoint_data_powershell` (TERM(EventCode=4103) OR "<EventID>4103<" OR TERM(EventCode=4104) OR "<EventID>4104<") TERM(wmic) TERM(AntiVirusProduct)
Stage 2: table
| table _time, host, user, process, process_*, parent_process, parent_process_*, user
Stage 3: regex
| regex process="(?i)\s+AntiVirusProduct\s+"
Stage 4: bucket
| bin span=1s
Stage 5: stats
| stats values(*) as * by _time, host
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.
Search terms
Bare-string tokens in the SPL search body. Splunk matches each token against _raw (the untyped raw event text) anywhere it appears, not against a specific field. These don't surface in the Indicators table because they aren't predicates on a known field.
| Stage | Term |
|---|---|
| 1 | TERM |
| 1 | "<EventID>4103<" |
| 1 | TERM |
| 1 | "<EventID>4104<" |
| 1 | TERM |
| 1 | wmic |
| 1 | TERM |
| 1 | AntiVirusProduct |