Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 5aefb6c88f29411c…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 3e14eed5a6ad08d131abfb5ca1791db0 SHA-1: 8b3f3e458baabd6bed4b5440781347b4b1d727d4 SHA-256: 5aefb6c88f29411cae7bf8f44928b2f6dc746d63b1458d6f52c9e6435d08b82f
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains a Workbook_Open VBA macro that uses CreateObject to execute a batch file and a VBScript. The script attempts to download and execute payloads from multiple URLs, including a PowerShell command that downloads content from 'http://sumedahonline.com/wp-content/hyzNXJ30XQEVcBRH/'. This behavior is characteristic of Emotet downloaders, which are designed to fetch and run further malicious stages.

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
51ad06a7c03223e5dc04d78a7b60fcb1dc232a99da13ad0dc2eb502e254c65c3		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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