Detection rules › Sigma
Windows Network Access Suspicious desktop.ini Action
Detects unusual processes accessing desktop.ini remotely over network share, which can be leveraged to alter how Explorer displays a folder's content (i.e. renaming files) without changing them on disk.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1547.009 Boot or Logon Autostart Execution: Shortcut Modification |
| Privilege Escalation | T1547.009 Boot or Logon Autostart Execution: Shortcut Modification |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Security-Auditing | 5145 | A network share object was checked to see whether client can be granted desired access. |
Stages and Predicates
Stage 1: selection
or:
AccessList|contains: AddSubdirectory
AccessList|contains: AppendData
AccessList|contains: DELETE
AccessList|contains: WriteDAC
AccessList|contains: WriteData
ObjectType: File
RelativeTargetName|endswith: '\desktop.ini'
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 |
|---|---|---|
AccessList | match |
|
ObjectType | eq |
|
RelativeTargetName | ends_with |
|
Neighbors
Broader alternatives (more inclusive than this rule)
These rules match a superset of what this rule catches. They cover the same events plus more. Use them if you want wider coverage and can absorb more false positives.
- Transferring Files with Credential Data via Network Shares (drops 3 filters this rule applies)