Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d65a42c31de252da…

MALICIOUS

Office (OLE)

155.5 KB Created: 2020-04-08 14:30:53 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: fadee60930b940017678e749a7d7baa6 SHA-1: ade2a94f66c764f5127c210057f8443f15124317 SHA-256: d65a42c31de252da2d550e69ee2376ba4d4355deb900b08416e9f55613b6ee47
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing encrypted Excel 4.0 macros, indicated by multiple high-severity heuristic firings. The presence of an 'AUTOOPEN' macro suggests an attempt to automatically execute code when the document is opened. The encrypted nature of the macros prevents further static analysis of their specific functionality, but the overall structure points to a malicious downloader or executioner.

Heuristics 3

  • OLE metadata lists many Excel 4.0 macro sheets high 2 related findings OLE_XLM_DOCPROPS_MACROSHEET_INVENTORY
    Workbook contains a BIFF Excel 4.0 macro-sheet marker and its clear OLE DocumentSummaryInformation stream lists many MacroN sheet titles. This is a useful static signal when FILEPASS encryption prevents formula extraction from the workbook stream.
  • Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
    Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
  • 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.

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