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handling-malware-samples-safely

Establishes safe practices for acquiring, storing, transferring, and disposing of malware samples: password-protected archives, neutralized extensions, hashing for identity, and chain-of-custody. Activates for requests about safely storing or sharing malware, sample handling hygiene, or defanging artifacts.

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含まれるファイル(4)

  • SKILL.md4.0 KB
  • LICENSE340 B
  • references/api-reference.md1.4 KB
  • scripts/analyst.py2.8 KB

SKILL.md(原文)

インストールする前に、エージェントに与えられる指示の中身を確認できます。

Handling Malware Samples Safely

When to Use

  • You are receiving, storing, or sharing a malicious file and need to prevent accidental execution or contamination.
  • You need a consistent naming and identity scheme so a sample can be tracked across tools and tickets.
  • You are packaging a sample to send to another analyst or a sandbox.

Do not use these conventions as a substitute for an isolated detonation environment; safe storage prevents accidents but analysis still requires an isolated lab.

Prerequisites

  • An archive tool that supports password-protected, encrypted archives (7-Zip).
  • A hashing utility (sha256sum, certutil, or the bundled script).
  • A defined storage location with restricted access, separate from general file shares.

Safety & Handling

  • Treat every sample as live. Never double-click; never leave it with its original executable extension on a working machine.
  • Store samples inside an encrypted, password-protected archive with the conventional password infected.
  • Neutralize the extension on disk (e.g. sample.exe → sample.exe.bin or sample.exe_) so the OS will not execute it on a stray click.
  • Defang indicators in any text leaving the lab: hxxp://, 1.2.3[.]4, evil[.]com.

Workflow

Step 1: Identify the sample by hash

A sample's identity is its SHA-256, not its filename. Compute hashes immediately:

python scripts/analyst.py hash sample.exe
# md5, sha1, sha256, size, ssdeep-like size bucket

Rename the working copy to its SHA-256 so identity travels with the file:

mv sample.exe 9f86d0818...<sha256>.bin

Step 2: Store in an encrypted archive

7z a -p"infected" -mhe=on <sha256>.7z <sha256>.bin
# -mhe=on encrypts filenames too

Keep the loose, neutralized copy only inside the lab; the archive is the storage/transfer form.

Step 3: Record provenance

Capture where the sample came from, when, and who handled it. The script can emit a JSON metadata record:

python scripts/analyst.py record <sha256>.bin --source "MalwareBazaar" --case CASE-001

Step 4: Defang before sharing

When pasting URLs/IPs into a report or ticket, defang them:

python scripts/analyst.py defang ioc.txt
# http://evil.com/x -> hxxp://evil[.]com/x

Validation

  • 7z l -slt <sha256>.7z shows encrypted headers (filenames not visible without password).
  • The on-disk working copy has a neutralized extension and matches the recorded SHA-256.
  • The provenance record contains source, timestamp, case ID, and all three hashes.
  • No raw clickable URLs/IPs remain in any artifact destined to leave the lab.

Pitfalls

  • Sharing a sample in a plain zip — mail gateways and AV will quarantine or mangle it, and recipients risk accidental execution. Always password-encrypt.
  • Trusting the filename or first-seen label as identity; only the hash is authoritative.
  • Forgetting filename encryption (-mhe=on), which leaks the sample name and your naming scheme.
  • Defanging only URLs but leaving live IPs or email addresses in the report.

References

  • See references/api-reference.md for the hashing, provenance, and defang tooling.
  • MalwareBazaar and NIST SP 800-86 (linked in frontmatter).

レビュー

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