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

Static analysis result for SHA-256 046fbc5b6de8203a…

MALICIOUS

Office (OLE) / .XLS

246.0 KB Created: 2020-11-11 04:31:19 Authoring application: Microsoft Excel
MD5: bb5ef8a5e34b1845703d805d85b69a8e SHA-1: 9475886e351af8a6ddfef41c74e12b2206ad73b2 SHA-256: 046fbc5b6de8203a99b58f4562b37a1cb8a525af798b2a4292f8119ca5a4f960
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 heuristic. This suggests the file is designed to execute malicious code when opened. The specific nature of the payload is not discernible due to encryption, leading to an unknown family classification.

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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