Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 541fa73e3fb14684…

MALICIOUS

Office (OLE)

161.0 KB Created: 2020-04-08 14:30:53 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: f5cf86e2acd65772a078c73fbbb70429 SHA-1: 9c861ecd413147f28134a8bfc14e1665944ac8da SHA-256: 541fa73e3fb146846b65c01daea722453446657262c9388bddd1d71a68049510
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 heuristic firings including 'OLE_XLM_ENCRYPTED_MACROSHEET' and 'OLE_XLM_AUTOOPEN'. The presence of these macros suggests the file is intended to execute malicious code, likely for initial access via spearphishing attachment.

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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