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

Static analysis result for SHA-256 48fa9bc2db1c2b15…

MALICIOUS

Office (OLE) / .XLSX

426.0 KB Created: 2021-12-16 12:50:02 Authoring application: Microsoft Excel
MD5: af93e75f32755fab7375886747450010 SHA-1: 9c62d7eb984fa358e364643a2eba66ea9eb98b6e SHA-256: 48fa9bc2db1c2b150ed1371f707a8b28c3b5219e3f4516670948e91633d70249
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing encrypted Excel 4.0 macros, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN heuristic firings. The presence of encrypted macros suggests an attempt to hide malicious functionality, likely for code execution or payload delivery. The document body was not parsable, limiting further analysis of the specific lure or content.

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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