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

Static analysis result for SHA-256 f197e7cbe2d0d821…

MALICIOUS

Office (OLE) / .XLSX

218.5 KB Created: 2020-09-24 19:34:15 Authoring application: Microsoft Excel
MD5: 3b189072320e5696510380b2a41092c5 SHA-1: 903c413de90b927fe13cc4798813fb3af43efd43 SHA-256: f197e7cbe2d0d821a97061b98fca876566165d23697ad5e7e07c6d5a38c96a28
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, indicated by the 'OLE_XLM_ENCRYPTED_MACROSHEET' heuristic. The presence of an 'AUTOOPEN' macro further suggests that malicious code is intended to execute automatically upon opening the file. The document body is unreadable due to its encrypted and corrupted nature, preventing a more specific analysis of the attack's intent.

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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