Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 70730b2e2b915460…

MALICIOUS

Office (OLE) / .XLSX

128.2 KB Created: 2022-01-17 21:27:03 Authoring application: Microsoft Excel
MD5: b2bc7b9e6322337fe7ab9b4564a0776f SHA-1: 76ec32dcd1c6f3e0f1f5ce742ac765ba0c7a2105 SHA-256: 70730b2e2b915460b29f280979de96339912418a1c5dcea03e8c5b9add9b291e
140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains Excel 4.0 macros, specifically an Auto_Open defined name that executes a command. This command attempts to download a file from a hardcoded URL and execute it. The ClamAV signature also indicates this is likely an Emotet downloader.

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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