Exploitation for Client Execution T1203

Events covered

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

Authoring guide

Patterns shared across the 44 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 (32 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 (394 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 (199 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 22 rules

• Audit CVE Event
• CVE-2021-26858 Exchange Exploitation
• CVE-2021-31979 CVE-2021-33771 Exploits
• CVE-2021-31979 CVE-2021-33771 Exploits by Sourgum
• CVE-2023-38331 Exploitation Attempt - Suspicious WinRAR Child Process
• Dfsvc.EXE Initiated Network Connection Over Uncommon Port
• Dfsvc.EXE Network Connection To Non-Local IPs
• Droppers Exploiting CVE-2017-11882
• Exploit for CVE-2017-0261
• Exploit for CVE-2017-8759
• Exploitation Activity of CVE-2025-59287 - WSUS Suspicious Child Process
• Java Running with Remote Debugging
• Network Connection Initiated By Eqnedt32.EXE
• Office Application Initiated Network Connection To Non-Local IP
• Potential CVE-2021-26857 Exploitation Attempt
• Potentially Suspicious Child Process of KeyScrambler.exe
• Potentially Suspicious Child Process Of WinRAR.EXE
• Shai-Hulud Malicious Bun Execution
• Shai-Hulud Malicious Bun Execution - Linux
• Suspicious ArcSOC.exe Child Process
• Suspicious HWP Sub Processes
• Suspicious Spool Service Child Process

Elastic 11 rules

• Creation of SettingContent-ms Files
• Execution of File Written or Modified by Microsoft Office
• Potential CVE-2025-33053 Exploitation
• Potential Foxmail Exploitation
• Potential Notepad Markdown RCE Exploitation
• Suspicious Communication App Child Process
• Suspicious MS Office Child Process
• Suspicious Outlook Child Process
• Suspicious PDF Reader Child Process
• Suspicious Zoom Child Process
• WPS Office Exploitation via DLL Hijack

Splunk 8 rules

• Abuse EQNEDT32.EXE (EDR)
• Abuse EQNEDT32.EXE (Sysmon)
• Abuse EQNEDT32.EXE (Windows Event Log)
• Potential Follina_DogWalk Activity - mdst.exe (Sysmon)
• Sunburst Correlation DLL and Network Event
• Suspicious process Spawned by Java (Windows Event Log)
• Windows MSC EvilTwin Directory Path Manipulation
• Windows Remote Image Load

Kusto 3 rules

• Execution of software vulnerable to webp buffer overflow of CVE-2023-4863
• Office Apps Launching Wscipt
• PE file dropped in Color Profile Folder