Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 5d6ba77bfd649ae3…

MALICIOUS

Office (OLE) / .XLSX

141.9 KB Created: 2022-01-19 09:31:16 Authoring application: Microsoft Excel
MD5: 021ddf6034597ef3dc3bdcf3b92e614c SHA-1: 85895da39a96279a3b797c001b5bce7afeb51247 SHA-256: 5d6ba77bfd649ae36a50df3bd458879fce4c5fb04a2dfbfbd64c927d086e94cd
140 Risk Score

Malware Insights

Emotet · confidence 95%

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, a common technique for initial execution. ClamAV detection further confirms its malicious nature, identifying it as an Emotet downloader. The document body, while appearing benign as a blood pressure tracker, serves as a lure to mask the macro execution.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • ClamAV: Doc.Downloader.EmotetExcel01220-9936774-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel01220-9936774-0
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
592af8991900f2f7058dc7ea90a33320ae293c7e541db4222a7b7f9c04f59d96		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8469 bytes

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