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

Static analysis result for SHA-256 067a39e7264b8263…

MALICIOUS

Office (OLE) / .XLS

231.0 KB Created: 2020-10-01 02:51:46 Authoring application: Microsoft Excel
MD5: f7873aafc5b29ba0a60bc741983d9cc5 SHA-1: 6ea2a3163bd038c5ddcdf850422df0326b297bbb SHA-256: 067a39e7264b8263412a8729fca76f7f918b5d8f090ddb454ddd74e4f921596a
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 suggests the file is designed to run malicious macros. The OLE_XLM_AUTOOPEN heuristic further confirms the presence of an auto-executing macro. Without further deobfuscation or script content, the exact payload and family remain unknown.

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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