Detection rules › Sigma
Outbound Network Connection Initiated By Cmstp.EXE
Detects a network connection initiated by Cmstp.EXE Its uncommon for "cmstp.exe" to initiate an outbound network connection. Investigate the source of such requests to determine if they are malicious.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Defense Evasion | T1218.003 System Binary Proxy Execution: CMSTP |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 3 | Network connection |
Stages and Predicates
Stage 1: selection
Image|endswith: '\cmstp.exe'
Initiated: true
Stage 2: not 1 of filter_main_local_ranges
or:
DestinationIp|cidr: '10.0.0.0/8'
DestinationIp|cidr: '127.0.0.0/8'
DestinationIp|cidr: '169.254.0.0/16'
DestinationIp|cidr: '172.16.0.0/12'
DestinationIp|cidr: '192.168.0.0/16'
DestinationIp|cidr: '::1/128'
DestinationIp|cidr: 'fc00::/7'
DestinationIp|cidr: 'fe80::/10'
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 |
|---|---|---|
DestinationIp | cidr_match |
|
Image | ends_with |
|
Initiated | eq |
|