Malicious Office (OLE) / .DOCX — malware analysis report

Static analysis result for SHA-256 d2b908317ba856b6…

MALICIOUS

Office (OLE) / .DOCX

1.24 MB Created: 2026-01-25 08:35:00 Authoring application: Microsoft Office Word First seen: 2026-02-25
MD5: 3ca8a9ab86a5f8d42bdc49a80fc36de3 SHA-1: e79ccc3f6517c911d6c1df79c94e88896f574e64 SHA-256: d2b908317ba856b6a49b5f4b9c63f077646b407eb779f172f9edfe4d8b886220
290 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.005 Visual Basic T1059.001 PowerShell T1204 User Execution T1059 Command and Scripting Interpreter

The sample is a malicious Microsoft Word document that exploits CVE-2007-3899, a memory corruption vulnerability. The presence of a Document_Open macro and a reference to CreateProcess API indicate that the macro attempts to execute arbitrary code. The ClamAV detection 'Doc.Dropper.HexEncodedEXEHeader-9789587-1' further supports this, suggesting the document acts as a dropper for an executable. The VBA macro code, though truncated, explicitly declares and uses the CreateProcessA API, confirming the intent to launch a new process. The specific vulnerability exploited is CVE-2007-3899.

Heuristics 9

  • CVE-2007-3899 — Microsoft Word malformed string memory corruption critical CVE likely CVE_2007_3899
    Word OLE document has the MS07-060 malformed-string exploit shape: a Word 97-family FIB points to a malformed DOP/string-table region with an abnormal INT_MAX run, inflated text counters, and exploit payload or Mdropper.Z campaign evidence.
  • ClamAV: Doc.Dropper.HexEncodedEXEHeader-9789587-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.HexEncodedEXEHeader-9789587-1
  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess API
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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.openxmlformats.org/officeDocument/2006/bibliography
    • http://schemas.openxmlformats.org/officeDocument/2006/customXml
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8e07a6786660f3dd2b1c6e2b5cc13ad4950f0c0085262af324dfd8a51d5dd99d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3755 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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