System Binary Proxy Execution: CMSTP T1218.003
Tactic: Stealth
Adversaries may abuse CMSTP to proxy execution of malicious code. The Microsoft Connection Manager Profile Installer (CMSTP.exe) is a command-line program used to install Connection Manager service profiles. CMSTP.exe accepts an installation information file (INF) as a parameter and installs a service profile leveraged for remote access connections.
Events covered
8 catalog events are tagged with this technique by at least one rule.
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
| Sysmon | Event ID 3 | Network connection |
| Sysmon | Event ID 7 | Image loaded |
| Sysmon | Event ID 10 | ProcessAccess |
| Sysmon | Event ID 12 | RegistryEvent (Object create and delete) |
| Sysmon | Event ID 13 | RegistryEvent (Value Set) |
| Sysmon | Event ID 14 | RegistryEvent (Key and Value Rename) |
| Security-Auditing | Event ID 4688 | A new process has been created. |
Authoring guide
Patterns shared across the 24 rules above: which fields they filter on, what specific values they look for, and what they exclude. The catalog normalizes field names across vendors so Sigma's Image, Elastic's process.name, and Splunk's process_name collapse into one row. Each rule contributes at most once per row.
Fields filtered most (21 distinct)
The fields most rules look at when detecting this technique. The How column shows the operators authors use (eq, wildcard, regex_match, match) and how often each appears. Sample values are concrete examples to start from, not an exhaustive list.
Top indicator values (221 distinct)
Specific (field, operator, value) combinations the rules check for, ranked by how many rules under this technique use each one. The Corpus reach column counts how many rules across the entire catalog (any technique) check the same combination. High numbers point to widely-used indicators that are likely noisy on their own; combine them with another condition for useful signal. Blank means the combination is specific to rules under this technique. Click a value to expand the rules under this technique that use it.
Exclusions (119 distinct)
Field/operator/value combinations excluded by rules under this technique (top-level not() clauses), sorted by how many rules exclude each. These are the false-positive paths the community has learned to filter out. A new rule that ignores the high-count entries here will likely fire on the same noisy paths. Click a value to expand the rules under this technique that exclude it.
Rules under this technique
Every rule in the catalog tagged with this technique, grouped by vendor. Click a rule title for its full predicates, exclusions, and indicators.
Sigma 7 rules
- Bypass UAC via CMSTP
- CMSTP Execution Process Access
- CMSTP Execution Process Creation
- CMSTP Execution Registry Event
- CMSTP UAC Bypass via COM Object Access
- DLL Loaded From Suspicious Location Via Cmspt.EXE
- Outbound Network Connection Initiated By Cmstp.EXE
Elastic 11 rules
- Delayed Execution via Ping
- Execution from Unusual Directory - Command Line
- Potential Defense Evasion via CMSTP.exe
- Suspicious .NET Code Compilation
- Suspicious JetBrains TeamCity Child Process
- Suspicious Managed Code Hosting Process
- Suspicious MS Office Child Process
- Suspicious MS Outlook Child Process
- Suspicious PDF Reader Child Process
- Unusual Network Activity from a Windows System Binary
- Unusual Process Network Connection