Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7d3c8394e9a2f66f…

MALICIOUS

Office (OLE)

374.0 KB Created: 2020-04-01 21:39:42 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 44bb157747e790f6d85cfe9e55f4fa7d SHA-1: f339ac5376e34099d3dba668c052ecf71a9b380f SHA-256: 7d3c8394e9a2f66f2d69f3b27d2abd34e0f3725fb4e43e10537ccc77850ada7f
100 Risk Score

Malware Insights

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

The sample is an Excel file containing encrypted Excel 4.0 macros, indicated by multiple high-severity heuristic firings. The presence of 'AUTOOPEN' suggests automatic execution upon opening. The document body is heavily corrupted, preventing analysis of its content, but the macro sheet structure strongly implies malicious intent, likely to download and execute a secondary payload.

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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