Remote Services: Distributed Component Object Model T1021.003

Events covered

14 catalog events are tagged with this technique by at least one rule.

Authoring guide

Patterns shared across the 42 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 (37 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 (636 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 (93 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 15 rules

• BaaUpdate.exe Suspicious DLL Load
• DCOM InternetExplorer.Application Iertutil DLL Hijack - Security
• DCOM lateral movement (via MMC20)
• HackTool - Potential Impacket Lateral Movement Activity
• Impacket DCOMexec privilege abuse via MMC
• Impacket DCOMexec process abuse via MMC
• MMC Spawning Windows Shell
• MMC20 Lateral Movement
• Potential DCOM InternetExplorer.Application DLL Hijack
• Potential DCOM InternetExplorer.Application DLL Hijack - Image Load
• Potential Excel.EXE DCOM Lateral Movement Via ActivateMicrosoftApp
• Remote DCOM/WMI Lateral Movement
• Suspicious BitLocker Access Agent Update Utility Execution
• Suspicious Speech Runtime Binary Child Process
• Suspicious WSMAN Provider Image Loads

Elastic 9 rules

• Incoming DCOM Lateral Movement via MSHTA
• Incoming DCOM Lateral Movement with MMC
• Incoming DCOM Lateral Movement with ShellBrowserWindow or ShellWindows
• Outbound Scheduled Task Activity via PowerShell
• Potential PowerShell HackTool Script by Function Names
• RPC (Remote Procedure Call) to the Internet
• Suspicious Cmd Execution via WMI
• WMI Incoming Lateral Movement
• WMIC Remote Command

Splunk 13 rules

• Impacket Lateral Movement Commandline Parameters
• Impacket Lateral Movement smbexec CommandLine Parameters
• Impacket Lateral Movement WMIExec Commandline Parameters
• Invoke-DCOM.ps1 - PowerShell (PowerShell)
• Invoke-DCOM.ps1 - PowerShell (Sysmon)
• Invoke-DCOM.ps1 - PowerShell (Windows Event Log)
• Mmc LOLBAS Execution Process Spawn
• Possible Lateral Movement PowerShell Spawn
• Remote Process Instantiation via DCOM and PowerShell
• Remote Process Instantiation via DCOM and PowerShell Script Block
• Windows Excel Spawning Microsoft Project Application
• Windows SpeechRuntime COM Hijacking DLL Load
• Windows SpeechRuntime Suspicious Child Process

Kusto 5 rules

• DCOM Lateral Movement
• Detect service account login on new device
• Detecting Macro Invoking ShellBrowserWindow COM Objects
• Lateral Movement via DCOM
• Powershell Empire Cmdlets Executed in Command Line