Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d3742cb031221461…

MALICIOUS

Office (OLE)

285.0 KB Created: 2020-04-13 22:10:15 Authoring application: Microsoft Excel First seen: 2020-08-25
MD5: b3016848de5579eaf45952aba875442d SHA-1: ed28801d88686370d6dbac44f1b4aa9f9130e884 SHA-256: d3742cb031221461d0fd87372523781f6c92f6ebc68b4f1cfb1f043f8c1cca28
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, a common technique to obfuscate malicious content. Heuristics indicate the presence of an AutoOpen macro, suggesting it executes automatically upon opening. The encrypted nature and the use of XLM macros point towards a downloader or initial execution stage.

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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