Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 0e47bec33d98520a…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 17b2853d92b67f425d146f282424c012 SHA-1: 5da7eec69a5e6ec57b516a9d621a44901580d6f3 SHA-256: 0e47bec33d98520a7e7afd3bf4a8c54bc4c11ac91ceda5be26d72e96cdc2c0ee
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample contains a Workbook_Open macro that uses CreateObject to execute a batch file and a VBScript. The VBA code also attempts to construct a URL from concatenated strings, which appears to be a download URL for a second-stage payload. The ClamAV detection name 'Xls.Downloader.EmotetExcel02223-9938902-0' strongly suggests Emotet family and downloader functionality.

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
31bb864a226c8ad42d778e5519d4c832e59759ef316899d624b255bcd025cedc		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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