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

Static analysis result for SHA-256 54eda3b52088d77f…

MALICIOUS

Office (OLE) / .XLS

206.5 KB Created: 2021-02-23 19:30:51 Authoring application: Microsoft Excel
MD5: 86a6d33926f4bc106b8004e6cc1ccc2b SHA-1: af94e43898835163f8812b199e2275577acde132 SHA-256: 54eda3b52088d77f73783300590920b720b9413c1965b67aadcea8a8dbed595f
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The OLE_XLM_AUTOOPEN heuristic further confirms the presence of an auto-executable macro. Due to the encryption and lack of readable document body or script content, the exact payload and delivery mechanism cannot be determined, but the presence of these macros strongly suggests malicious 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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