Detection rules › Sigma
Suspicious Access to Sensitive File Extensions
Detects known sensitive file extensions accessed on a network share
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Collection | T1039 Data from Network Shared Drive |
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:
RelativeTargetName|endswith: .bak
RelativeTargetName|endswith: .dmp
RelativeTargetName|endswith: .edb
RelativeTargetName|endswith: .kirbi
RelativeTargetName|endswith: .msg
RelativeTargetName|endswith: .nsf
RelativeTargetName|endswith: .nst
RelativeTargetName|endswith: .oab
RelativeTargetName|endswith: .ost
RelativeTargetName|endswith: .pst
RelativeTargetName|endswith: .rdp
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 |
|---|---|---|
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 1 filter this rule applies)