Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b35f3e26dc36112f…

MALICIOUS

Office (OLE)

41.0 KB Created: 2009-09-30 18:09:00 Authoring application: Microsoft Word 11.0
MD5: 10d062ba1c594cc573dabed0d92547c6 SHA-1: ef79a85443cd8ec0422095e779d9690f3815af42 SHA-256: b35f3e26dc36112f09e5a0e426c548d2158de92e8dd0388b697609e6ac9ec7be
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is a Microsoft Word document containing VBA macros, specifically a Document_Open macro, which is a common technique for executing malicious code upon opening. The document body presents a vocabulary lesson, likely a lure to encourage users to enable macros. While no specific payload or download URL was extracted, the presence of the Document_Open macro and the ClamAV detections strongly suggest the execution of a malicious second-stage payload.

Heuristics 4

  • ClamAV: Doc.Trojan.Marker-40 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-40
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
1af8fe9d6d207df24d7e3c46cd908e9277e9f236f57900f892fcf69496f39cb9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4237 bytes
Detection
ClamAV: Doc.Trojan.Marker-2
Obfuscation or payload: unlikely

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