Detect data-staging activity (MITRE ATT&CK T1074) by analyzing EDR/Sysmon process-creation and file-system telemetry (Event ID 4688, Sysmon 1/11) for 7-Zip/RAR/tar archive creation, unusual temp or hidden folder access, and anomalous consolidation of files from multiple directories. Use when hunting for pre-exfiltration staging behavior, building detection rules for archiver abuse, or validating monitoring coverage for T1074.
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Use hunting-for-data-staging-before-exfiltration to analyze authorized [EDR or Sysmon logs] for T1074 staging indicators and produce a timeline, risk-scored findings, detection recommendations, and MITRE mapping.
Required inputs
[EDR or Sysmon logs]
User-approved starter prompt based on a pinned source version; check current skill requirements before running. Task evidence ↗
SKILL.md
name: hunting-for-data-staging-before-exfiltrationdescription: Detect data-staging activity (MITRE ATT&CK T1074) by analyzing EDR/Sysmon process-creation and file-system telemetry (Event ID 4688, Sysmon 1/11) for 7-Zip/RAR/tar archive creation, unusual temp or hidden folder access, and anomalous consolidation of files from multiple directories. Use when hunting for pre-exfiltration staging behavior, building detection rules for archiver abuse, or validating monitoring coverage for T1074.domain: cybersecuritysubdomain: threat-huntingtags: - data-staging- exfiltration- t1074- archive-detection- edr- threat-hunting- dlpversion: '1.0'author: mahipallicense: Apache-2.0d3fend_techniques: - File Metadata Consistency Validation- Content Format Conversion- File Content Analysis- Platform Hardening- File Format Verificationnist_csf: - DE.CM-01- DE.AE-02- DE.AE-07- ID.RA-05mitre_attack: - T1046- T1057- T1082- T1083- T1048
Hunting for Data Staging Before Exfiltration
Overview
Before exfiltrating data, adversaries typically stage collected files in a central location (MITRE ATT&CK T1074). This involves creating archives with tools like 7-Zip, RAR, or tar, consolidating files from multiple directories, and using temporary or hidden staging directories. This skill detects staging behavior by analyzing process creation logs for archiver activity, monitoring file system events in common staging paths, and identifying anomalous file consolidation patterns.
When to Use
When investigating security incidents that require hunting for data staging before exfiltration
When building detection rules or threat hunting queries for this domain
When SOC analysts need structured procedures for this analysis type
When validating security monitoring coverage for related attack techniques
Prerequisites
EDR or Sysmon telemetry with process creation and file system events
Windows Event Logs (Event ID 4688) or Sysmon Event ID 1, 11
Python 3.8+ with standard library
Access to process creation logs in JSON/CSV format
Steps
Detect Archive Tool Execution — Monitor for 7z.exe, rar.exe, tar, zip, and WinRAR process creation with compression arguments
Identify Staging Directories — Flag file writes to common staging locations (Recycle Bin, %TEMP%, ProgramData, hidden directories)
Detect Large File Consolidation — Identify patterns of multiple file reads followed by writes to a single directory
Monitor Sensitive Path Access — Track bulk reads from document directories, database paths, and network shares
Analyze Archive Metadata — Extract and analyze archive file sizes, creation times, and source paths
Score Staging Risk — Apply heuristic scoring based on archive size, source diversity, staging path suspicion, and timing
Generate Hunt Report — Produce a structured report with staging event timeline and MITRE ATT&CK mapping
Expected Output
JSON report of detected staging events with risk scores
Archive creation timeline with source file analysis