Individual skill
analyzing-slack-space-and-file-system-artifacts
Examine file system slack space, MFT entries, USN journal, and alternate data streams to recover hidden data and reconstruct file activity on NTFS volumes.
internal/tools/skills/data/digital-forensics/analyzing-slack-space-and-file-system-artifacts/SKILL.md
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- Last checked
- Nov 9, 2026
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- cybersecurity Repository topic
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- golang Repository topic
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- forensics Declared skill tag
- slack-space Declared skill tag
- ntfs Declared skill tag
- mft Declared skill tag
- usn-journal Declared skill tag
- alternate-data-streams Declared skill tag
- file-system-analysis Declared skill tag
- data Derived category
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# Analyzing Slack Space and File System Artifacts
## When to Use
- When searching for hidden or residual data in file system slack space
- For analyzing NTFS Master File Table (MFT) entries for deleted file metadata
- When reconstructing file operations from the USN Change Journal
- For detecting Alternate Data Streams (ADS) used to hide data or malware
- During deep forensic analysis requiring examination beyond standard file recovery
## Detection Gaps & Validation
- **Most-missed artifacts:** beyond file slack, examine MFT record slack (prior-file remnants in the 1024-byte entry), resident `$DATA` of small deleted files, `$LogFile` transactions (which survive after the USN wraps), `$Bitmap` to test cluster reallocation, and non-Zone.Identifier ADS. `fls`/Explorer hide ADS - enumerate them explicitly and carve unallocated with `bulk_extractor`/`foremost`.
- **USN wrap and slack overwrite:** `$UsnJrnl:$J` is sparse and circular, so older events vanish on wrap - absence is not proof. Slack/unallocated is volatile too: any new write can overwrite the residual data, so a clean slack region does not mean nothing was hidden. Corroborate with `$LogFile` and Volume Shadow Copies.
- **Timestomping detection ($SI vs $FN):** `$STANDARD_INFORMATION` times are user-settable; `$FILE_NAME` times are kernel-only. Flag $SI predating $FN, identical/zeroed sub-second values, or $SI inconsistent with MFT entry-number ordering, then confirm against `$LogFile`/USN before calling it deliberate.