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

Static analysis result for SHA-256 7c935d2254d035e8…

MALICIOUS

Office (OLE) / .DOC

859.0 KB Created: 2005-04-15 10:09:00 Authoring application: Microsoft Office Word
MD5: 21b76eae193b46c8d5f30b5eeaa0fff1 SHA-1: 34fa90d41628f1abfb373594e03c2c526270e6e5 SHA-256: 7c935d2254d035e83c9bbd807f3e38e4a30a00595e35efda0c74243e860f8145
128 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1505.003 Server Software Component: Office Application Startup

The sample is a Microsoft Word document containing VBA macros, including a Document_Open macro, which is a common technique for executing malicious code upon opening. The presence of an XLM macro sheet further indicates malicious intent. The VBA script appears to interact with a companion file (indicated by the ',6' extension) and potentially saves or closes the document, suggesting it's part of a multi-stage attack. The extracted artifact 'macros.bas' is also flagged as suspicious.

Heuristics 5

  • 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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
577b4858cf1b694733dbeff3efe5ffdd3afc0ab487d1da2ef9bdc4826d85bbab
vba-macro oletools.olevba.extract_macros (decoded VBA source) 33644 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.