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sflock

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Sample staging & detonation utility to be used as unpacking engine for other analysis tools. Since version 0.3 sflock is compatible with both Python 2 and Python 3 (to be precise, Python 2.7, 3.5, and 3.6).

Birds tend to move around in flocks, therefore the sflock utility can digest a flock of samples, but also inverse flocks, i.e., sflock unpacks various archive file formats to extract embedded samples.

Simply put, sflock provides a staging area where binary data is investigated and split into one or more files to be analyzed further by other tools. In particular sflock focuses on integration and usage with Cuckoo Sandbox.

Installation

As-is sflock has been designed to be used to its full extent on Ubuntu/Debian-like systems. For optimal usage it is recommended to install the following packages alongside sflock. It is currently not possible to run the unpackers that require native tooling support on non-Linux platforms.

$ sudo apt-get install p7zip-full rar unace-nonfree cabextract

Installation of sflock itself may be done as follows.

$ sudo pip install -U sflock

Or in a virtualenv environment.

(venv)$ pip install -U sflock

Installation (Windows)

Since version 0.2 sflock properly supports Windows-based operating systems.

To avoid difficult setup instructions, sflock ships the required 32-bit and 64-bit binaries to use libmagic under Windows such that it works flawlessly.

Note: on Windows the 7z, ace, cab, daa, gzip, iso, lzh, and rar file formats are not supported.

Installation (macOS)

Since version 0.2 sflock properly supports macOS-based operating systems. One does have to manually install libmagic though. This may be done through the brew package manager.

$ brew update
$ brew install libmagic

Note: on macOS the 7z, ace, cab, daa, gzip, iso, lzh, and rar file formats are not supported.

Supported archives

SFlock supports a number of (semi-)archive types, sorted by extension:

  • .7z (7-Zip archive, requires native tooling)
  • .ace (ACE archive, requires native tooling)
  • .bup (McAfee quarantine files)
  • .cab (Microsoft Cabinet archive, requires native tooling)
  • .daa (PowerISO, requires included Linux native tooling)
  • .eml (MIME RFC 822 email representation)
  • .gzip (gzip compressed data, requires native tooling)
  • .iso (ISO file container, requires native tooling)
  • .lzh (LZH/LHA archive, requires native tooling)
  • .msg (Outlook mail message)
  • .mso (Microsoft Office Macro reference file)
  • .pdf (Attachments embedded in PDF files)
  • .rar (RAR archive, requires native tooling)
  • .tar (Unix file archive)
  • .tar.bz2 (bzip2 compressed Unix file archive)
  • .tar.gz (gzip compressed Unix file archive)
  • .zip (ZIP archive)

Security

Due to its nature of unpacking malicious archives with, depending on the extension, native tools (i.e., .7z, .ace, .cab, .daa, .gzip, .iso, .lzh, and .rar), it is important that such operations happen securely. SFlock therefore wraps execution of the native tools in zipjail, a usermode sandbox written exactly for this purpose.