Detection rules › Splunk
MultiDump.exe Execution (Sysmon)
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
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
Rule body yaml
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
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>1<" |
| 1 | "rundll32" |
| 1 | "OpenOptimizationControlPanel" |
| 1 | "cleanup" |
| 1 | "defrag" |
| 1 | "optimize:startup" |
| 1 | "report" |
| 1 | ".dmp" |