Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 631d9f66d749cd95…

MALICIOUS

Office (OLE)

157.0 KB Created: 2020-04-08 14:30:53 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 6de8d7adedfd6a2d3b37371cdc0ae446 SHA-1: e946540397eee398275106c4f1a9bd75a239369e SHA-256: 631d9f66d749cd95e424a6d80e6a8e6ba1ccfcf8ce4332c05f5439663a4cc7e2
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 for obfuscating malicious content. The presence of 'AUTOOPEN' and multiple macro sheets indicates an intent to automatically execute code. The document body is unreadable due to truncation and likely obfuscation, preventing further analysis of its specific payload or delivery mechanism.

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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