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

Static analysis result for SHA-256 ae91e3d3e4f1e372…

MALICIOUS

Office (OLE) / .XLS

59.0 KB Created: 2020-04-27 23:19:44 Authoring application: Microsoft Excel
MD5: 91fa3de14062d249dee131fc63481755 SHA-1: 8156bd929cbcb5b6459a1f4e166457063756f0e8 SHA-256: ae91e3d3e4f1e37273ba45b1d8ddd83e4e699597b5a05ea6f2efe24cff1fd728
60 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The OLE_XLM_AUTOOPEN heuristic suggests that macros are present and likely intended to execute automatically upon opening. The document body is unreadable, but the presence of encrypted macros strongly suggests a malicious intent, likely to download and execute a secondary payload.

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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