Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 fc1db16fdf3d0462…

MALICIOUS

Office (OLE) / .XLS

80.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-06-16
MD5: cd9bfc87fc5c31d52172c759b0a1182f SHA-1: e6214d05bb51ce28e32615446106db1b86b9382f SHA-256: fc1db16fdf3d04620e7a8b113999204bc0ed03f71618cbc54236d9b6ca6cd0ef
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is an Excel 4.0 macro-enabled spreadsheet detected as Emotet by ClamAV. The critical heuristics indicate the presence of an Auto_Open macro that uses dangerous functions, specifically the RUN function. The macro concatenates strings to form URLs, which are likely used to download and execute a second-stage payload. The reconstructed URLs are: http://byrndest3.com/cgi-bin/TEq/bin/, http://carbobros.co.za/logs/KSTJNdxZ73hIZPKddEDT/, http://www.bublefootballurope.de/wp-admin/3aMnYP/, and http://caso.com/proxy/kk0OWcstqPOOyeG/.

Heuristics 4

  • 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.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • ClamAV: Xls.Downloader.Emotet-ea81817e7f807ab1-9952142-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-ea81817e7f807ab1-9952142-0
  • 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
2fdf21f2db447f9be93416b81af1c740576c18d6efe5c8c6f3d215a65c941f1d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6790 bytes

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