Detection rules › Sigma
Suspicious Calculator Usage
Detects suspicious use of 'calc.exe' with command line parameters or in a suspicious directory, which is likely caused by some PoC or detection evasion.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Defense Evasion | T1036 Masquerading |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 1 | Process creation |
| Security-Auditing | 4688 | A new process has been created. |
Stages and Predicates
Stage 1: selection_1
CommandLine|contains: '\calc.exe '
Stage 2: selection_2
Image|endswith: '\calc.exe'
Stage 3: not filter_main_known_locations
or:
Image|contains: ':\Windows\SysWOW64\'
Image|contains: ':\Windows\System32\'
Image|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 |
|---|---|---|
CommandLine | match |
|
Image | ends_with |
|
Image | match |
|