Detection rules › Splunk
Reg.exe Process Execution (Windows Event Log)
Reg is a Windows utility used to interact with the Windows Registry. It can be used at the command-line interface to query, add, modify, and remove information
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1112 Modify Registry |
| Defense Impairment | T1112 Modify Registry |
| Discovery | T1012 Query Registry |
References
Event coverage
| Provider | Event | Title |
|---|---|---|
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
id: '6935.8202'
title: Reg.exe Process Execution
description: 'Reg is a Windows utility used to interact with the Windows Registry.
It can be used at the command-line interface to query, add, modify, and remove information.
-- Threat Actor Association: Kimsuky -- Software Association: BlackByte, Clop, Snatch,
Trickbot -- Atomics T1037.001 Test#1 Atomics T1137.004 Test#1 Atomics T1137.002
Test#1 Atomics T1137 Test#1 Atomics T1547.001 Test#1 Atomics T1547.001 Test#2 Atomics
T1546.002 Test#1 Atomics T1547.010 Test#1 Atomics T1546.010 Test#1 Atomics T1548.002
Test#1 Atomics T1548.002 Test#8 Atomics T1574.011 Test#2 Atomics T1562.004 Test#2'
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_winevent` (TERM(EventCode=4688) OR
"<EventID>4688<") "reg.exe" | table _time, host, user user, process, process_*,
parent_* | bin span=1s | stats values(*) as * by _time, host '
techniques:
- defense-evasion:modify registry
- discovery:query registry
technique_id:
- T1112
- T1012
data_category:
- Windows event logs
references:
- https://unit42.paloaltonetworks.com/unit42-rancor-targeted-attacks-south-east-asia-using-plaintee-ddkong-malware-families/
Stages and Predicates
Stage 1: search
`get_endpoint_data` `get_endpoint_data_winevent` (TERM(EventCode=4688) OR "<EventID>4688<") "reg.exe"
Stage 2: table
| table _time, host, user user, process, process_*, parent_*
Stage 3: bucket
| bin span=1s
Stage 4: 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.
| Field | Kind | Values |
|---|---|---|
EventCode | eq |
|
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>4688<" |
| 1 | "reg.exe" |