Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 677e96c45b7d459b…

MALICIOUS

Office (OLE) / .XLS

108.7 KB Created: 2022-01-22 10:28:51 Authoring application: Microsoft Excel
MD5: da005e1d77b790b4e7f13b8b33d47eb8 SHA-1: 8026e06d9af5f82ec2dadf77d70baf4615758c91 SHA-256: 677e96c45b7d459b90128c62cea326921fd521e88bfe6b4cd0ebdeb4d099dd21
140 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is an Excel spreadsheet containing Excel 4.0 macros, specifically an Auto_Open entry, which is a common technique for Emotet to download and execute a secondary payload. ClamAV also detected the file as 'Xls.Downloader.Emotet'. The document body content is a generic time card, likely a lure.

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
4282a66cb39a54151a7150b41c26dfb71d035cb8ac904f3e031d21c44da4ada6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3523 bytes

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