Individual skill
detecting-t1055-process-injection-with-sysmon
Detect process injection techniques (T1055) including classic DLL injection, process hollowing, and APC injection by analyzing Sysmon events for cross-process memory operations, remote thread creation, and anomalous DLL loading patterns.
internal/tools/skills/data/threat-hunting/detecting-t1055-process-injection-with-sysmon/SKILL.md
Source commit d42f381ad34843e71a42658e5c57290c713e85af
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- Observed behavior
- Instructions only
- Last checked
- Nov 9, 2026
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- Repository last updated
- Nov 9, 2026
- License
- Apache-2.0
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- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- threat-hunting Declared skill tag
- process-injection Declared skill tag
- sysmon Declared skill tag
- mitre-t1055 Declared skill tag
- defense-evasion Declared skill tag
- dll-injection Declared skill tag
- process-hollowing Declared skill tag
- operations Derived category
- security Derived category
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# Detecting T1055 Process Injection with Sysmon
## When to Use
- When hunting for defense evasion techniques that hide malicious code inside legitimate processes
- After EDR alerts for suspicious cross-process memory access or remote thread creation
- When investigating malware that injects into svchost.exe, explorer.exe, or other system processes
- During purple team exercises testing detection of process injection variants
- When validating Sysmon configuration coverage for injection detection
## Detection Gaps & Validation
- **EID 8 only catches `CreateRemoteThread`:** thread-hijacking (T1055.003, `SetThreadContext`), APC/early-bird injection (T1055.004, `QueueUserAPC`), and ListPlanting (T1055.015) never call CreateRemoteThread — lean on EID 10 ProcessAccess (`0x0008|0x0020|0x0002`) and memory scanners for these.
- **Reflective / module-stomping loads** write code without an EID 7 ImageLoaded from disk, so DLL-path rules miss them — pe-sieve/Moneta memory scans are the fallback.