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

Static analysis result for SHA-256 14ebf6a7ca36c88a…

MALICIOUS

Office (OLE) / .XLSX

3.86 MB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2026-02-25
MD5: ce283f85a1d80763462803150cd88267 SHA-1: f5a129ba4141361ca266950dc4adcb2c548aa949 SHA-256: 14ebf6a7ca36c88a60f822b08a956646aa1e44d4adb5db79e6ceec4b1fb66a9a
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is a malicious Excel file containing VBA macros, specifically a Workbook_Open macro. This macro utilizes the CreateProcessA API, indicating an attempt to execute a secondary payload. The ClamAV detection name 'Doc.Dropper.HexEncodedEXEHeader' further supports the dropper functionality. The exact nature of the dropped payload is not fully discernible due to script truncation, but the intent is to execute external code.

Heuristics 6

  • 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
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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
7aff7be05b483d522bc9ff57a3e19bafcb6e9b1cef5faa59af0fe62d9c65438b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4001 bytes

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