Potential Secure Deletion with SDelete

Severity: medium
Author: Thomas Patzke
Source: upstream

Detects files that have extensions commonly seen while SDelete is used to wipe files.

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1027.005` Obfuscated Files or Information: Indicator Removal from Tools, `T1070.004` Indicator Removal: File Deletion, `T1553.002` Subvert Trust Controls: Code Signing
Impact	`T1485` Data Destruction

Event coverage

Provider	Event ID	Title
Security-Auditing	4656	A handle to an object was requested.
Security-Auditing	4658	The handle to an object was closed.
Security-Auditing	4663	An attempt was made to access an object.

Stages and Predicates

Stage 1: `selection`

or:
ObjectName|endswith: .AAA
ObjectName|endswith: .ZZZ

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
`ObjectName`	ends_with	`.AAA` `.ZZZ`

Neighbors

Often fire together

Rules that target events appearing in the same incident timelines. They pattern-match on adjacent steps of the same TTP, so an alert from one is often paired with alerts from these. Useful for triage context and for assembling chained-detection rules.

Azure AD Health Monitoring Agent Registry Keys Access [sigma]
Azure AD Health Service Agents Registry Keys Access [sigma]
Processes Accessing the Microphone and Webcam [sigma]
LSASS Access From Non System Account [sigma]
WCE wceaux.dll Access [sigma]
Potentially Suspicious AccessMask Requested From LSASS [sigma]
SysKey Registry Keys Access [sigma]
Sysmon Channel Reference Deletion [sigma]

Share event IDs (chain-detection candidates)

Rules that observe the same Windows event-ID pairs as this one. If you're authoring a multi-stage / sequence rule that spans these events, these are the existing detections that already cover one or both endpoints.

Azure AD Health Monitoring Agent Registry Keys Access [sigma]
Azure AD Health Service Agents Registry Keys Access [sigma]
Processes Accessing the Microphone and Webcam [sigma]
LSASS Access From Non System Account [sigma]
WCE wceaux.dll Access [sigma]
Potentially Suspicious AccessMask Requested From LSASS [sigma]
SysKey Registry Keys Access [sigma]
Windows Defender Exclusion Registry Key - Write Access Requested [sigma]