MultiDump.exe Execution (Sysmon)

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

MultiDump is a post-exploitation tool written in C with a Python handler designed to discreetly dump and extract LSASS memory without triggering Defender alerts. This use case detects rundll32 executions with specific command line parameters unique to MultiDump.

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1003.001` OS Credential Dumping: LSASS Memory `T1003.002` OS Credential Dumping: Security Account Manager

References

Telemetry coverage

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

Rule body

id: '28417.52060'
title: MultiDump.exe Execution
description: MultiDump is a post-exploitation tool written in C with a Python handler
  designed to discreetly dump and extract LSASS memory without triggering Defender
  alerts. This use case detects rundll32 executions with specific command line parameters
  unique to MultiDump.
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_sysmon` (TERM(EventCode=1) OR "<EventID>1<")
  "rundll32" "OpenOptimizationControlPanel" "cleanup" "defrag" "optimize:startup"
  "report" ".dmp" | table _time, host, user, process, process_*, parent_process_*
  | bin span=1s | stats values(*) as * by _time, host '
techniques:
- credential-access:os credential dumping:security account manager
- credential-access:os credential dumping
- credential-access:os credential dumping:lsass memory
technique_id:
- T1003.002
- T1003
- T1003.001
data_category:
- Windows Sysmon
- Process command-line parameters
references:
- https://xre0us.io/posts/multidump/
- https://github.com/Xre0uS/MultiDump?tab=readme-ov-file

Stages and Predicates

Stage 1: `search`

`get_endpoint_data` `get_endpoint_data_sysmon` (TERM(EventCode=1) OR "<EventID>1<") "rundll32" "OpenOptimizationControlPanel" "cleanup" "defrag" "optimize:startup" "report" ".dmp"

Stage 2: `table`

| table _time, host, user, process, process_*, parent_process_*

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	`"rundll32"`
1	`"OpenOptimizationControlPanel"`
1	`"cleanup"`
1	`"defrag"`
1	`"optimize:startup"`
1	`"report"`
1	`".dmp"`