Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 637653bfd8f1eea1…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: f89668f45ca32b8ad12b5e4d1ce622c8 SHA-1: e8e47e7b5a6a9f335f92f63cee9533d071791408 SHA-256: 637653bfd8f1eea17670c2bee21ed73c45bf2914d3f60ad34c5952b0b6c8aa9a
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

The critical ClamAV detection and high-severity heuristics for Workbook_Open macros and CreateObject calls indicate a malicious macro-enabled document. The VBA script attempts to download and execute a payload using PowerShell, with reconstructed URLs including 'http://sumedahonline.com/wp-content/HyzNXJ30XQVBSRH/'. The presence of Emotet-related indicators further supports this assessment.

Heuristics 5

  • ClamAV: Xls.Downloader.EmotetExcel02223-9938902-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.EmotetExcel02223-9938902-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 12041 bytes
vbaProject_00.bin
b27ba3a5e5f4af2070f75aa726d62e205fa485a280e36f83f74bb0ad01381bc4		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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