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

Static analysis result for SHA-256 2e588f0420412048…

MALICIOUS

Office (OLE) / .XLSX

278.0 KB Created: 2021-12-16 12:50:02 Authoring application: Microsoft Excel
MD5: 9c01d6db92cfd97a929519c270b8d459 SHA-1: f929f9fda51eff50df1c580979dd056ce2522515 SHA-256: 2e588f0420412048ed919b6d3cf3b3d30944528857cb6518ca2973f05031cf46
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. This type of macro sheet is frequently used to hide malicious code that can be executed upon opening the document. While no specific payload or URL was extracted, the presence of encrypted macros strongly suggests a malicious intent, likely for initial access or payload delivery.

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.

Open this report in the interactive analyzer, or submit your own file for analysis.