ATT&CK coverage › Technique
Remote Services: Distributed Component Object Model T1021.003
Adversaries may use Valid Accounts to interact with remote machines by taking advantage of Distributed Component Object Model (DCOM). The adversary may then perform actions as the logged-on user.
Events covered
6 catalog events are tagged with this technique by at least one rule.
Authoring guide
Patterns shared across the 16 rules above: which fields they filter on, what specific values they look for, and what they exclude. Field names are normalized 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 (12 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 (106 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.
Common exclusions (1 distinct)
Field/operator/value combinations that rules under this technique routinely exclude (top-level not() clauses). 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.
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 11 rules
- BaaUpdate.exe Suspicious DLL Load
- DCOM InternetExplorer.Application Iertutil DLL Hijack - Security
- HackTool - Potential Impacket Lateral Movement Activity
- 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
- Suspicious BitLocker Access Agent Update Utility Execution
- Suspicious Speech Runtime Binary Child Process
- Suspicious WSMAN Provider Image Loads
Splunk 2 rules
- Remote Process Instantiation via DCOM and PowerShell Script Block
- Windows SpeechRuntime COM Hijacking DLL Load