Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4b0ff1e5bf39f64e…

MALICIOUS

Office (OLE)

70.5 KB Created: 2020-04-15 05:50:52 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 42ebba0b4ebeafa446c72447875516d3 SHA-1: 434f35138a6d861bad9dcf304181187d22ce5098 SHA-256: 4b0ff1e5bf39f64ef2d1fd0d94a16eb507a63a19a0ffaf06542c4f3b32114efc
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an Excel 4.0 macro sheet, identified by heuristics indicating encrypted macros and an auto-open macro. The presence of these elements strongly suggests an attempt to execute arbitrary code upon opening the document. The document body was unreadable, preventing further analysis of the specific lure or payload.

Heuristics 2

  • 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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