Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 ef9dc479eafe8eb9…

MALICIOUS

Office (OLE) / .XLSX

221.0 KB Created: 2020-09-24 19:32:47 Authoring application: Microsoft Excel
MD5: 0095fec787d0418ffb0b970dd986ac78 SHA-1: 7597f82bafde18dbed674e9ab64d0c2dde39b66d SHA-256: ef9dc479eafe8eb905dd1ab078009ce1a705a3a0d7f2372ec6c62a83784b180d
60 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 the OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN heuristic firings. The encrypted nature of the macros prevents further static analysis of their specific actions. However, the presence of encrypted XLM macros strongly suggests a malicious intent, likely to download and execute a secondary 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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