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

Static analysis result for SHA-256 6553608ca39b7160…

MALICIOUS

Office (OLE) / .XLS

198.0 KB Created: 2020-10-18 22:56:27 Authoring application: Microsoft Excel
MD5: d79d0f4fff111e7d42adf9bcdaefffc0 SHA-1: 49b77c8e5634f730fd2013f5218c89a0d4c7ac9b SHA-256: 6553608ca39b7160c11d5d85703f73a29aa46f546d546e9828fea37182e9b1e8
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, identified by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. This strongly suggests the presence of malicious macro code designed to execute automatically, likely for downloading and executing a secondary payload. The lack of readable document body text or extracted scripts prevents a more detailed analysis of the specific payload or 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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