windows enabled community critical v1.0.0

comsvcs

COM+ Services Located at: c:\windows\system32\comsvcs.dll.

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comsvcs
comsvcs

Sandbox: execFile · Timeout: 30s

Capabilities

credential.dump

Contract

Outputs

process.output

Command execution output

Side effects: process_spawn

Workflow Edges

Produces

process.output

Resource Profile

ResourceValue
CPUlow
Memory16 MB
Networklow
Disk I/Olow

Examples

Calls the MiniDump exported function of comsvcs.dll, which in turns calls MiniDumpWriteDump. (Dump Lsass.exe process memory to retrieve credentials.)

rundll32 C:\windows\system32\comsvcs.dll MiniDump {LSASS_PID} dump.bin full

Detection

TypeRule / Indicator
sigma https://github.com/SigmaHQ/sigma/blob/c04bef2fbbe8beff6c7620d5d7ea6872dbe7acba/rules/windows/process_creation/proc_creation_win_rundll32_process_dump_via_comsvcs.yml
sigma https://github.com/SigmaHQ/sigma/blob/683b63f8184b93c9564c4310d10c571cbe367e1e/rules/windows/process_access/proc_access_win_lsass_dump_comsvcs_dll.yml
elastic https://github.com/elastic/detection-rules/blob/5bdf70e72c6cd4547624c521108189af994af449/rules/windows/credential_access_cmdline_dump_tool.toml
splunk https://github.com/splunk/security_content/blob/86a5b644a44240f01274c8b74d19a435c7dae66e/detections/endpoint/dump_lsass_via_comsvcs_dll.yml

Documentation

comsvcs

comsvcs is a Windows LOLBin. COM+ Services Located at: c:\windows\system32\comsvcs.dll.

References