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

Static analysis result for SHA-256 108115c5eb39a0c8…

MALICIOUS

Office (OLE) / .XLS

167.5 KB Created: 2020-11-10 04:26:51 Authoring application: Microsoft Excel
MD5: c77e7a0138ba8677153567ab3cdf2f48 SHA-1: 16cabae9ae94ae24cfb10d77e246c919a2e7d746 SHA-256: 108115c5eb39a0c8237ee62c7ef8fbdbc83e3914bbe3ba95cf8cf5bc0dc18ae1
60 Risk Score

Malware Insights

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

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN heuristics. This strongly suggests the file is designed to execute malicious macros upon opening, a common technique for delivering secondary payloads. The lack of readable document body text or scripts prevents further 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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