Sysmon Event ID 10 records one process opening another process, often before reading or writing its memory. Attackers use this for credential dumping, code injection and inspection of security tools. Focus on the source and target process relationship, then filter out noisy legitimate access so meaningful inter-process access stands out.
What Sysmon Event ID 10 actually tells you
Sysmon Event ID 10 is about inter-process access, so the key question is not just whether one process touched another, but what kind of access it requested and why. A benign tool, an EDR sensor, or a browser helper can generate the same event pattern as an attacker, so the useful signal comes from the source process, the target process, and the context around the access.
The event becomes meaningful when you can explain the purpose of the open-process action. If the source process is unusual for the target, or if access appears shortly before memory reading, credential harvesting, or injection-like behaviour, Event ID 10 can be an early indicator of hostile activity rather than a routine administrative action.
Because Windows generates legitimate process-to-process access constantly, this event is best treated as a relationship record, not a verdict. The practical task is to separate expected tool behavior from suspicious cross-process access, then preserve the events that line up with other signs of compromise such as unusual process trees, privilege escalation, or later memory manipulation.
Attacks that commonly surface in Event ID 10
Credential dumping is the classic use case. Attackers often open sensitive processes to inspect memory, capture secrets, or prepare for theft from authentication-related components. When the source process should never need that level of access, Event ID 10 can expose the precursor to credential theft even before the stolen material is used elsewhere.
Code injection and process tampering also show up here. Malware may open a target process to allocate memory, write payloads, or prepare a remote thread, which turns a normal process into a host for attacker-controlled code. That makes Event ID 10 useful for spotting the access phase of injection, not just the later symptoms. For deeper context on process access patterns and Sysmon filtering, see the Sysmon Guide.
Security-tool inspection is another common pattern. Attackers frequently probe EDR, AV, or other monitoring processes to learn what defenses are running, whether memory access is blocked, or whether they can disable, evade, or blind the tools that would otherwise see them. That is why suspicious access to defensive software matters even when no payload is written.
These patterns are easier to interpret when paired with broader Windows telemetry. A process access event may be the first clue, but logon context, service creation, and subsequent command execution often determine whether the access was an administrative task or part of an intrusion chain. The Windows Event Log Guide is useful for correlating Event ID 10 with adjacent Windows events.
How to read Event ID 10 without drowning in noise
The most important filter is target sensitivity. Access to LSASS, security tooling, browsers, script hosts, credential managers, or other high-value processes deserves more scrutiny than access to ordinary user processes. The same event becomes far more suspicious when the source process is unsigned, newly launched, living in an unexpected path, or associated with tooling that normally has no reason to inspect memory.
The second filter is sequence. Event ID 10 is more compelling when it is followed by behaviour that fits the attacker’s objective, such as dumps, remote thread creation, abnormal child processes, or lateral movement. On its own, the event can only tell you that access happened; the surrounding sequence is what turns it into evidence of credential theft or injection.
PowerShell, scripting, and administrative tooling can also appear in these chains, especially when operators use legitimate management features in ways that overlap with attacker tradecraft. The PowerShell Security Guide helps when you need to distinguish normal admin automation from suspicious follow-on activity after a process access event.
What to do when Event ID 10 looks hostile
When a suspicious access event points at a sensitive target, treat it as a potential precursor to compromise, not as a standalone alert. Confirm whether the source process is expected on that host, whether the target process is a high-value credential or monitoring process, and whether the timing matches another signal such as logon anomalies, privilege changes, or endpoint detections.
If the access appears tied to credential dumping or injection, prioritize containment and memory-preserving investigation before overreacting to a single noisy event. A process access alert is most useful when it helps you decide what to isolate, what evidence to preserve, and whether the host may already have had secrets exposed. If you need a broader adversary-view of how credential access and lateral movement fit together, the State of NHI & AI Agent Breach Report 2026 provides a useful breach-oriented lens on how attackers exploit stolen access material.
Build your detections around source-target relationships, not Event ID 10 in isolation. Focus on combinations such as unexpected process pairings, access to protected targets, repeated access attempts, and access from tooling that should never need to inspect memory. That approach keeps the alert useful for both investigation and hunting.
Practitioner takeaway: Event ID 10 is most valuable when you use it to rank process pairings by intent, then confirm whether the access fits credential dumping, injection, or defense evasion before you spend time on lower-value noise.
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 NIST CSF 2.0 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 to sensitive memory often precedes credential dumping. |
| T1055 — Process Injection | Event ID 10 can capture the access stage used before injection or tampering. | |
| T1562 — Impair Defenses | Attackers may inspect or target security tools before disabling or evading them. | |
| Recommendation — Map suspicious process-access chains to T1003 and hunt for credential-harvesting follow-on activity. Correlate cross-process access with T1055 indicators and investigate injection prerequisites. Look for access to security tooling as a precursor to defense impairment and evasion. | ||
| NIST CSF 2.0 | DE.CM-01 — Monitored Networks, Systems and Assets | Sysmon Event ID 10 is a monitoring signal used to detect suspicious process interaction. |
| Recommendation — Use process-access telemetry as a monitored asset signal and tune detections for high-value targets. | ||
| NIST SP 800-53 Rev 5 | AU-6 — Audit Review, Analysis, and Reporting | Event ID 10 becomes actionable when analysts review and correlate it with other evidence. |
| Recommendation — Review process-access events in context and escalate only when the source-target pair is atypical. | ||