Reg.exe Process Execution (Sysmon)

Group by: _time, host
Source: github.com/anvilogic-forge/armory

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

https://unit42.paloaltonetworks.com/unit42-rancor-targeted-attacks-south-east-asia-using-plaintee-ddkong-malware-families/

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation

Rule body

id: '6935.8203'
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_sysmon` (TERM(EventCode=1) OR "<EventID>1<")
  "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 Sysmon
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_sysmon` (TERM(EventCode=1) OR "<EventID>1<") "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

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`EventCode`	eq	`1` corpus 241 (splunk 225, kusto 15, elastic 1)	`field:"EventID" kind:eq value:"1"`

Search terms

These SPL tokens match against raw event text.

Stage	Term
1	`"<EventID>1<"`
1	`"reg.exe"`