Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 05a9444b1542ec13…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: af6dc2fdceb52af76b9053e1e22beabb SHA-1: 2a923ca09e178af389970319bd648e71a4d64c44 SHA-256: 05a9444b1542ec135d08695868dbb352c697919c919db882fa8ad5dda1698ca3
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

This XLSX file contains a Workbook_Open VBA macro that uses CreateObject to execute obfuscated PowerShell commands. The script attempts to download and execute a second-stage payload from multiple URLs, including one that decodes to 'http://sumedhaonline.com/wp-content/HyzNXJ30XQEVcBS RH/'. The presence of a Workbook_Open macro and the nature of the payload strongly indicate Emotet activity.

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
b42fc5f6a6da4b6c896c1c0d4d704fb52080c1f5388fbcac80c2973e0a63e5fb		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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