Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 5e73e8c9b885e1d0…

MALICIOUS

Office (OOXML) / .XLSX

135.6 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: d757af1d4e8cae5d7aa5fb03fd2b03e5 SHA-1: 669e51112dd4fe4656d56234ef0858030c644f59 SHA-256: 5e73e8c9b885e1d052cbc46c1e8c94c9fe70b0b507450333ceaef3841624bf76
120 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file was detected as malicious by ClamAV with the signature 'Xls.Downloader.Emotet-OOXML_XL-af43432fbcb8603c-9980048-0', indicating it is an Emotet downloader. Static analysis revealed the presence of Excel 4.0 macros, which are commonly used by Emotet to download and execute further stages. The embedded macro sheet is the primary indicator of this malicious behavior.

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
503cc5255e3893c37771adee7e13daba46e5b4071e56a514ef4cc61cc6d637cd		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin 1769 bytes

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