Malicious Office (OOXML) / .DOC — malware analysis report

Static analysis result for SHA-256 837f40c12fc476d8…

MALICIOUS

Office (OOXML) / .DOC

278.9 KB Created: 2020-05-11 15:09:00 UTC Authoring application: Microsoft Office Word 14.0000
MD5: 5b195d34bd601700f499d97a6aed4069 SHA-1: 77995f57d2b831ec1f60d7cef1725ae9e62f4347 SHA-256: 837f40c12fc476d81d0741da2ab0bc0ee5c9857fe9623f2dfa33fb9f9d20f6ce
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature 'Doc.Dropper.HexEncodedEXEHeader-9789587-1'. Static analysis revealed the presence of VBA macros, specifically a 'Document_Open' macro and a 'GetObject' call, indicating an attempt to automatically execute code upon opening. The 'macros.bas' file and the 'vbaProject.bin' further confirm the presence of obfuscated VBA code, typical of droppers that download and execute additional payloads.

Heuristics 6

  • ClamAV: Doc.Dropper.HexEncodedEXEHeader-9789587-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.HexEncodedEXEHeader-9789587-1
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2010/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShape

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0959b7c2370575a35f4b692c8afae77630667f781a877e49f97deba52078ff0e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1912 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 23 Chr/ChrW string-construction calls.
vbaProject_00.bin
73ed17f72491574ac9703487a9dca7695f88d9ea91056d71c40abf41a7a86741		 vba-project OOXML VBA project: word/vbaProject.bin 21504 bytes

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