Techniques › T1127.002 › AN0550
AN0550 Analytic 0550
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Abuse of ClickOnce applications where rundll32.exe invokes dfshim.dll with ShOpenVerbApplication or dfsvc.exe spawns unexpected child processes or loads unsigned modules.</p>
- Detects
- T1127.002 ClickOnce
- Part of
- DET0191 Behavior-chain detection strategy for T1127.002 Trusted Developer Utilities Proxy Execution: ClickOnce (Windows)
Log sources and channels
Exactly as MITRE states them in x_mitre_log_source_references. Where a channel is vague, it is vague in the source; kevmap does not tidy it.
| Log source | Channel | Data component |
|---|---|---|
| WinEventLog:Security | EventCode=4688 | DC0032 Process Creation |
| WinEventLog:Sysmon | EventCode=7 | DC0016 Module Load |
| WinEventLog:Microsoft-Windows-Security-Mitigations/KernelMode | ETW telemetry indicating ClickOnce deployment (dfsvc.exe) launching payloads | DC0034 Process Metadata |
Mutable elements
Parameters MITRE marks as environment-specific. These are the knobs you are expected to tune; they are why an analytic is not a rule.
| Field | Description |
|---|---|
TimeWindow | The correlation window for dfsvc.exe/rundll32.exe execution and subsequent module loads or child processes (e.g., 0–10 minutes). |
KnownClickOnceApps | Whitelist of legitimate ClickOnce applications and paths. |
SuspiciousChildList | Child processes considered abnormal when launched by dfsvc.exe or rundll32.exe. |