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

Static analysis result for SHA-256 de5f6268a58c6dd2…

MALICIOUS

Office (OLE) / .XLS

175.5 KB Created: 2020-11-10 04:28:20 Authoring application: Microsoft Excel
MD5: 49ebb7ee3a5298bb187069ac2fc5e7a0 SHA-1: 39d91a51f85a6a6030999f02746d52ff14043eb4 SHA-256: de5f6268a58c6dd2ea02aa2c00e862547414f3ab6c66bf629a75ce29671fe4b1
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 presence of an auto-open macro (OLE_XLM_AUTOOPEN) suggests it's designed to execute automatically upon opening. While the document body is heavily obfuscated and unreadable, the macro sheet structure strongly implies 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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