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Attachments

beta.binexplode

beta.binexplode(input: Attachment) -> [BinExplodeOutput]

BinExplode uses Strelka, a file extraction and metadata collection system developed by Target.

Strelka uses a variety of scanners to parse files of a specific flavor and performs data collection and/or file extraction on them. Strelka can recursively extract nested files (like a Word doc within a Zip file), identify malicious scripts, suspicious executables and text, run analysis like OCR and Macro detection, and more. For more information on how Strelka works, see the official Strelka documentation.

For a list of all available scanners, see the Github repo or the official Strelka docs.

// detect HTML smuggling techniques
any(attachments, .file_extension in~ ('html', 'htm') and
  any(beta.binexplode(.), 
    any(.scan.javascript.identifiers, . == "unescape")) 
)

// detect encrypted zip files
any(attachments,
  any(beta.binexplode(.), 
    any(.flavors.yara, . == 'encrypted_zip'))
)

// detect attachments soliciting the user to enable macros using OCR
any(attachments,
  any(beta.binexplode(.),
    any(.scan.ocr.text, ilike(., "*please*"))
    and any(.scan.ocr.text, ilike(., "*enable*"))
    and any(.scan.ocr.text, ilike(., "*macros*")))
)

// detect macros with auto-open
any(attachments,
  any(beta.binexplode(.),
    any(.scan.vba.auto_exec, . == "AutoOpen"))
)

// detect macros calling an exe
any(attachments,
  any(beta.binexplode(.),
    any(.scan.vba.hex, ilike(., "*exe*")))
)

View detection rules that use this function

👍

Coming soon

• YARA support
• External API integrations, like VirusTotal
• Analyze binaries from external URLs, like Google Drive and drive-by downloads

beta.oletools

beta.oletools(input: Attachment) -> OleToolsOutput

Oletools, developed by Philippe Lagadec, analyzes Microsoft OLE2 files such as Microsoft Office documents for malware and other suspicious indicators.

Use beta.oletools to analyze attachments for malware or suspicious indicators like VBA macros, remote OLE objects, encryption, and more.

// detect suspicious macros
any(attachments, beta.oletools(.).indicators.vba_macros.exists)
any(attachments, beta.oletools(.).indicators.vba_macros.risk == "high")

// detect potential attempts to exploit CVE-2021-40444  (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40444)
any(attachments, any(beta.oletools(.).relationships, iregex_search(.target, ".*html:http.*")))

// detect external OLE object relationships
any(attachments, beta.oletools(.).indicators.external_relationships.count > 0)

// detect encrypted Office documents
any(attachments, beta.oletools(.).indicators.encryption.exists)

// detect macros that attempt to auto-execute when the document is opened
any(attachments, any(beta.oletools(.).macros.keywords, .type == "autoexec"))

// detect suspicious macro source code
any(attachments, iregex_search(beta.oletools(.).macros.vba_code_all_modules, ".*kernel32.*", ".*GetProcessId.*"))

View detection rules that use this function