Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 042c1af61f1ff259…

MALICIOUS

Office (OOXML) / .XLSX

134.9 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: 90b4ed00c698bae4dad0ba2f96d61716 SHA-1: c3dc9f3b3e581c85a8dff79b38efa1dfff20f38a SHA-256: 042c1af61f1ff25918274a04d90b31ac3b34170e4df49305e4126f1b2ea3a986
120 Risk Score

Malware Insights

Emotet · confidence 95%

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

The critical heuristic 'OOXML_XLM_MACROSHEET' indicates the presence of Excel 4.0 macros. ClamAV detection confirms this as Emotet, a known downloader family. The macros are likely responsible for fetching and executing a malicious payload, a common tactic for Emotet.

Heuristics 2

  • Excel 4.0 macro sheet (1 sheet(s)) critical OOXML_XLM_MACROSHEET
    Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks. The macro sheet is stored as XLSB/BIFF12 binary content, which many XML-only OOXML scanners miss.
  • ClamAV: Xls.Downloader.Emotet-OOXML_XL-af43432fbcb8603c-9980048-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-OOXML_XL-af43432fbcb8603c-9980048-0

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.bin
ceeea1db76a24b5304a1189b38960679852f0101773fc87e6a6e8704e7557147		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin 1918 bytes

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