Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 01168cb6d2ac5925…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 09347d2b01886b0ecf0bddd524e65a2d SHA-1: 439fc16a33f1dcd01f871d146f1bea0bad03b3da SHA-256: 01168cb6d2ac592521bea265aa40f11c1e8d8510705101b6c7151af7d592ab45
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains a Workbook_Open macro that uses CreateObject to execute a batch file and a VBScript. The critical ClamAV detection and the presence of VBA macros strongly indicate Emotet. The reconstructed command line within the DOC BODY indicates the execution of a batch file and a VBScript, likely for downloading and executing further 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
9c88763f2837145e2f4f38342219eea1c7be5ec3e2a8a2961e8d0452d38d0f40		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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