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

Static analysis result for SHA-256 a449db8785122e37…

MALICIOUS

Office (OLE) / .XLS

245.5 KB Created: 2020-09-14 21:28:14 Authoring application: Microsoft Excel
MD5: aa533f3325aca3c1de116f1c6ded8e85 SHA-1: 9d19ee326384074d7c2a1adf178276a58930c83e SHA-256: a449db8785122e372305e3611767533d26db08ca147b043fbcf15e006106edad
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an OLE_XLM_AUTOOPEN heuristic suggests that the macro sheet is designed to execute automatically upon opening. Due to the encrypted nature of the macro sheet, the specific payload and execution method could not be determined.

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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