Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 8d3ba952eed9cfe2…

MALICIOUS

Office (OLE) / .XLS

142.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-03-23
MD5: e854a2ced24075fa6103cb962e073013 SHA-1: 89a01ff0ea80bc86813c211621df42a943a3db2e SHA-256: 8d3ba952eed9cfe2ccfa5133ed236695b79eaf5bc76fc2affaed53ca8baba543
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell

The file is an Excel 4.0 macro-enabled spreadsheet, detected by ClamAV as Emotet. The XLM macros contain an Auto_Open function that constructs URLs from concatenated strings and attempts to download and execute a payload. The reconstructed URLs are: http://www.certika-bolivia.com/omeltxveatup/9Gb/, http://www.cfoodsnepal.com/index/rvAYVKkJgVWiCwt0wV/, http://www.cgaei.com/fonts/ABuQi/, http://www.chotdonhang.com/noi-dung/w1hMfkjuwAne4W2epiP/, http://www.charmingsoftech.com/css/mJQYPVknv/, http://www.cnrgroup.co.uk/cgi-bin/iRHPslY/, and http://www.cristianleyton.com/wp-includes/y3Ug/. This indicates a downloader functionality typical of Emotet.

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-adc2d23d2dc26dd0-9950240-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-adc2d23d2dc26dd0-9950240-0
  • 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
c3bd905689d687353d0a6ca74c75350acca34739f0a59b140233810335008981		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6820 bytes

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