ID | Technique | Tactic |
---|---|---|
T1070 | Indicator Removal | Defense Evasion |
T1070.001 | Clear Windows Event Logs | Defense Evasion |
Detection: Suspicious Event Log Service Behavior
Description
The following analytic detects the shutdown of the Windows Event Log service using Windows Event ID 1100. This event is logged every time the service stops, including during normal system shutdowns. Monitoring this activity is crucial as it can indicate attempts to cover tracks or disable logging. If confirmed malicious, an attacker could hide their activities, making it difficult to trace their actions and investigate further incidents. Analysts should verify if the shutdown was planned and review other alerts and data sources for additional suspicious behavior.
Search
1(`wineventlog_security` EventCode=1100)
2| stats count min(_time) as firstTime max(_time) as lastTime by dest name EventCode
3| `security_content_ctime(firstTime)`
4| `security_content_ctime(lastTime)`
5| `suspicious_event_log_service_behavior_filter`
Data Source
Name | Platform | Sourcetype | Source |
---|---|---|---|
Windows Event Log Security 1100 | Windows | 'xmlwineventlog' |
'XmlWinEventLog:Security' |
Macros Used
Name | Value |
---|---|
security_content_ctime | convert timeformat="%Y-%m-%dT%H:%M:%S" ctime($field$) |
suspicious_event_log_service_behavior_filter | search * |
suspicious_event_log_service_behavior_filter
is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Annotations
Default Configuration
This detection is configured by default in Splunk Enterprise Security to run with the following settings:
Setting | Value |
---|---|
Disabled | true |
Cron Schedule | 0 * * * * |
Earliest Time | -70m@m |
Latest Time | -10m@m |
Schedule Window | auto |
Creates Risk Event | False |
Implementation
To successfully implement this search, you need to be ingesting Windows event logs from your hosts. In addition, the Splunk Windows TA is needed.
Known False Positives
It is possible the Event Logging service gets shut down due to system errors or legitimately administration tasks. Filter as needed.
Associated Analytic Story
Risk Based Analytics (RBA)
Risk Message | Risk Score | Impact | Confidence |
---|---|---|---|
The Windows Event Log Service shutdown on $dest$ | 9 | 30 | 30 |
References
-
https://docs.microsoft.com/en-us/windows/security/threat-protection/auditing/event-1100
-
https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1070.001/T1070.001.md
Detection Testing
Test Type | Status | Dataset | Source | Sourcetype |
---|---|---|---|---|
Validation | ✅ Passing | N/A | N/A | N/A |
Unit | ✅ Passing | Dataset | XmlWinEventLog:Security |
XmlWinEventLog |
Integration | ✅ Passing | Dataset | XmlWinEventLog:Security |
XmlWinEventLog |
Replay any dataset to Splunk Enterprise by using our replay.py
tool or the UI.
Alternatively you can replay a dataset into a Splunk Attack Range
Source: GitHub | Version: 4