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

Static analysis result for SHA-256 30d25edc05c27f67…

MALICIOUS

Office (OLE) / .XLSX

244.5 KB Created: 2020-09-14 21:28:14 Authoring application: Microsoft Excel
MD5: 1de3bae0ef87865d104dc37131894224 SHA-1: a28f7653cdccb3e8c733d7d9d5642f9d85cdecf4 SHA-256: 30d25edc05c27f67a78c505269aa046d92c1cfae1583da6b8a52c5edb66a8676
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an OLE_XLM_AUTOOPEN heuristic suggests that the macro is designed to execute automatically upon opening the spreadsheet. Due to the encrypted nature of the macro sheet, the specific payload and execution flow could not be determined, leading to an unknown family attribution and a moderate confidence score.

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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