Sysmon Event ID 10 is the ProcessAccess event, generated when one process opens another process. It is often followed by queries or reads and writes against the target process memory. Monitor it for credential theft, injection and other suspicious cross-process access, and filter carefully to reduce noise.
What Sysmon Event ID 10 Actually Tells You
Sysmon Event ID 10 records cross-process access, which means one process has opened another process and may then inspect its memory or perform related operations. That makes it a high-signal event for understanding process interaction on Windows, especially when the target is a browser, security product, or credential-bearing process.
By itself, the event does not prove malicious activity. Legitimate software often opens other processes for diagnostics, accessibility, compatibility, telemetry, or security inspection. The value comes from context, such as the source process, target process, requested access rights, timing, parent-child chain, and whether the activity matches an expected administrative or product workflow.
Why Process Access Is Security-Relevant
Process-to-process access matters because it can expose memory, tokens, secrets, and sensitive runtime state that were never meant to be read by another process. Attackers often abuse this pathway for credential dumping, code injection, and tampering with security tools or browser sessions.
The same event can also reveal defensive activity, such as endpoint protection products inspecting other processes or incident responders using forensic tooling. A useful interpretation starts with whether the access pattern is normal for that host, that application, and that user context.
When you review this event, treat it as a visibility point into trust boundaries inside the endpoint. A process that can reach into another process often has enough access to bypass application-level protections if the environment is poorly governed.
How Analysts Use It in Detection Work
Event ID 10 becomes much more useful when it is correlated with the target process name, the source image path, the command line, and nearby events that show follow-on behavior. Analysts often look for access to LSASS, browsers, EDR agents, terminal sessions, or other high-value processes, then compare that access against the host's normal baseline.
Filtering is important because this event can be noisy. Security tooling, accessibility software, and legitimate administrative utilities may generate frequent process access records, so allowlisting and scoped rules are usually necessary to keep the signal usable in a SIEM.
For a broader view of how Sysmon events fit into a detection program, see the Sysmon Guide. For the surrounding Windows telemetry that often helps confirm intent, the Windows Event Log Guide is a useful companion reference.
What Good Triage Looks Like
The practical question is not simply whether Event ID 10 occurred, but whether the access is expected and proportionate. Triage improves when you compare the source process against approved software, look for unusual access to sensitive targets, and check whether the same host also shows signs of privilege escalation, script abuse, or credential theft.
Cross-process access is especially important when it appears shortly before authentication abuse, lateral movement, or suspicious data collection. In those cases, Event ID 10 can be an early indicator that a process is preparing to read memory, extract secrets, or interfere with another running application.
For analysts who need to understand adjacent abuse patterns, the PowerShell Security Guide helps connect suspicious scripting to the same endpoint activity chain, while the Kerberos Security Guide is useful when process access is part of credential-theft activity that later affects ticket-based authentication.
Risk and Threat Considerations
Process access becomes risky when an attacker can use one process to inspect, inject into, or manipulate another process that holds sensitive runtime material. That is why this event is often associated with credential theft, session abuse, and stealthy endpoint compromise rather than simple application diagnostics.
Failure mechanism: An attacker or malicious tool obtains cross-process access, then uses that relationship to read memory, inject code, or interfere with a protected process without needing direct interactive access to the target application.
Impact: The result can be theft of credentials or tokens, tampering with security controls, or privileged execution paths that are harder to detect than ordinary file or network activity.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack and risk surface, while CIS Controls v8 and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| MITRE ATT&CK | T1003 — OS Credential Dumping | Process access commonly supports memory reading used in credential dumping. |
| T1055 — Process Injection | Process access is a common precursor or enabling step for process injection. | |
| Recommendation — Map suspicious cross-process reads to credential-dumping techniques and hunt for post-access privilege escalation. Correlate process-access events with injection indicators to confirm hostile process manipulation. | ||
| CIS Controls v8 | CIS-8 — Audit Log Management | Sysmon Event ID 10 is a logging signal that needs collection, filtering, and review. |
| Recommendation — Centralize Sysmon telemetry and tune retention and filtering so cross-process access remains actionable. | ||
| NIST SP 800-53 Rev 5 | AU-6 — Audit Record Review, Analysis, and Reporting | This event is useful only when audit records are reviewed and analyzed for suspicious behavior. |
| SI-4 — System Monitoring | Sysmon Event ID 10 supports continuous monitoring for suspicious endpoint activity. | |
| Recommendation — Review process-access logs for anomalous source-target pairs and escalate confirmed suspicious patterns. Use endpoint monitoring to detect anomalous cross-process access against high-value targets. | ||
Practitioner Guidance
What to watch for: Focus on unusual source-to-target combinations, especially when a non-administrative process opens a high-value target or when the access pattern clusters around logon, privilege changes, or suspicious script execution. The most useful triage comes from pairing the event with the process lineage and the surrounding endpoint telemetry.
Governance implication: Treat Event ID 10 filtering as a detection engineering decision, not a static log setting. Good tuning preserves visibility into high-risk access paths while suppressing predictable noise from trusted software, so the rule set should be reviewed whenever approved tools or endpoint protections change.
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Reviewed and updated by the NHIMG editorial team on October 18, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org