Detection rules › Splunk
Remote .msi Installation (Windows Event Log)
Adversaries may abuse msiexec.exe to proxy execution of malicious payloads. Msiexec.exe is the command-line utility for the Windows Installer and is thus commonly associated with executing installation packages (.msi). The Msiexec.exe binary may also be digitally signed by Microsoft. This use case detects attempts to install .msi from remote locations
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth |
References
Telemetry coverage
Rule body
id: '18093.30444'
title: Remote .msi Installation
description: 'Adversaries may abuse msiexec.exe to proxy execution of malicious payloads.
Msiexec.exe is the command-line utility for the Windows Installer and is thus commonly
associated with executing installation packages (.msi). The Msiexec.exe binary may
also be digitally signed by Microsoft. This use case detects attempts to install
.msi from remote locations. -- Threat Actor Association: APT-K-47/Mysterious Elephant
-- Atomics T1218.007 Test #11'
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_winevent` ((TERM(EventCode=4688) OR
"<EventID>4688<" OR Type=Process) (TERM(/i) OR TERM(install)) ".msi") OR (TERM(EventCode=1040)
OR TERM(EventCode=1042) OR "<EventID>1040<" OR "<EventID>1042<") "://" | where (match(process,
"(?i)\w+tps?://\S+\.msi") and match(signature_id, "4688")) or (match(message, "(?i)\w+tps?://\S+\.msi")
and match(signature_id, "1040|1042")) | table _time, host, user process, process_*,
parent_* | bin span=1s | stats values(*) as * by _time, host '
techniques:
- defense-evasion:system binary proxy execution:msiexec
technique_id:
- T1218.007
data_category:
- Process command-line parameters
- Windows event logs
references:
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1218.007/T1218.007.md#atomic-test-11---msiexecexe---execute-remote-msi-file
Stages and Predicates
Stage 1: search
`get_endpoint_data` `get_endpoint_data_winevent` ((TERM(EventCode=4688) OR "<EventID>4688<" OR Type=Process) (TERM(/i) OR TERM(install)) ".msi") OR (TERM(EventCode=1040) OR TERM(EventCode=1042) OR "<EventID>1040<" OR "<EventID>1042<") "://"
Stage 2: where
| where (match(process, "(?i)\w+tps?://\S+\.msi") and match(signature_id, "4688")) or (match(message, "(?i)\w+tps?://\S+\.msi") and match(signature_id, "1040|1042"))
Stage 3: table
| table _time, host, user process, process_*, parent_*
Stage 4: bucket
| bin span=1s
Stage 5: stats
| stats values(*) as * by _time, host
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
EventCode | eq |
| field:"EventID" kind:eq |
message | regex_match |
| field:"message" kind:regex_match |
process | regex_match |
| field:"CommandLine" kind:regex_match |
signature_id | regex_match |
| field:"signature_id" kind:regex_match |
Search terms
These SPL tokens match against raw event text.
| Stage | Term |
|---|---|
| 1 | "<EventID>4688<" |
| 1 | "/i" |
| 1 | install |
| 1 | ".msi" |
| 1 | "<EventID>1040<" |
| 1 | "<EventID>1042<" |
| 1 | "://" |