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monitoring-process-and-file-behavior

Summarizes runtime behavior of a sample from Procmon-style operation logs — process and thread creation, file and registry writes, and network-related operations — to build a behavioral profile. Activates for requests to analyze Procmon output, summarize sample behavior, or profile process/file/registry activity from a sandbox run.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

설치 방법 보기

포함된 파일(4)

  • SKILL.md2.9 KB
  • LICENSE340 B
  • references/api-reference.md1.1 KB
  • scripts/analyst.py2.7 KB

SKILL.md(원문)

설치하기 전에 에이전트에게 전달되는 지시 내용을 확인할 수 있습니다.

Monitoring Process and File Behavior

When to Use

  • You have a Procmon CSV/XML export (or equivalent sandbox operation log) from detonating a sample.
  • You need a concise behavioral profile: child processes, file writes, registry persistence, and network-related calls.
  • You are correlating dynamic behavior with static indicators.

Do not use this to detonate the sample yourself — it consumes already-captured logs. Run the sample only inside an isolated, instrumented sandbox you own.

Prerequisites

  • A Procmon CSV export (or comparable operation log) from an isolated detonation.

Safety & Handling

  • Only consume logs; never execute the sample on an analyst workstation.
  • Defang any captured URLs/hosts before sharing.

Workflow

Step 1: Summarize operations by category

python scripts/analyst.py summarize procmon.csv

Counts operations by class (Process/Thread, File, Registry, Network) and lists the busiest paths.

Step 2: Identify process tree

Extract Process Create events to reconstruct parent/child relationships and command lines — LOLBins (powershell, rundll32, mshta) spawned from the sample are high-signal.

Step 3: Identify persistence and drops

Registry writes under Run/RunOnce/services, and file writes to %APPDATA%/%TEMP%/startup, indicate persistence and staged payloads.

Step 4: Build the behavioral profile

Map observed operations to ATT&CK techniques and defang any network endpoints.

Validation

  • The process tree reconstructs from Process Create events.
  • File and registry writes are categorized with their target paths.
  • Observed behaviors map to specific ATT&CK techniques.

Pitfalls

  • Treating noisy read operations as significant — writes and creates carry the signal.
  • Missing short-lived child processes that exited before capture stopped.
  • Ignoring path normalization (%TEMP% vs absolute) when deduplicating.

References

리뷰

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