Detection rules › Sigma
SCR File Write Event
Detects the creation of screensaver files (.scr) outside of system folders. Attackers may execute an application as an ".SCR" file using "rundll32.exe desk.cpl,InstallScreenSaver" for example.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Defense Evasion | T1218.011 System Binary Proxy Execution: Rundll32 |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 11 | FileCreate |
Stages and Predicates
Stage 1: selection
TargetFilename|endswith: .scr
Stage 2: not filter
or:
TargetFilename|contains: ':\$WINDOWS.~BT\NewOS\'
TargetFilename|contains: ':\WUDownloadCache\'
TargetFilename|contains: ':\Windows\SysWOW64\'
TargetFilename|contains: ':\Windows\System32\'
TargetFilename|contains: ':\Windows\WinSxS\'
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 |
|---|---|---|
TargetFilename | ends_with |
|
TargetFilename | match |
|