Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e888042663f8f2e4…

MALICIOUS

Office (OLE)

102.5 KB Created: 2020-04-21 13:56:55 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 8607d6f6dea40f690923a7be2643532d SHA-1: 2a3e96bd3ee44297f95a620dc55198f37c514c80 SHA-256: e888042663f8f2e4eb5c3060ffc01d45c5002d025fa9d75aca2fd12cf9d6ea66
100 Risk Score

Malware Insights

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

The sample is an encrypted Excel 4.0 macro sheet, indicated by multiple high-severity heuristic firings. The presence of an 'AUTOOPEN' macro suggests it attempts to execute automatically upon opening. The document body is heavily obfuscated and unreadable, preventing a detailed analysis of its specific payload or intent, but the macro sheet structure strongly implies malicious execution.

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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