Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 33f5d4ca23a93213…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 3352c4cffda83179bfdab16590d05bfe SHA-1: 5b0da152ae68b642098706e0cbe38df32c26d211 SHA-256: 33f5d4ca23a93213186a80fcb140c2ec3be7ad1161395a056fe4bf920ef3aac2
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 strongly indicate malicious intent. The VBA script attempts to execute obfuscated PowerShell commands, including a long string that decodes to multiple URLs, likely for downloading and executing a second-stage payload. The presence of Emotet 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
c8aa103cf40c8ffab48d194c4bd7833e671b04d59b211acebd956b6d62470d52		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.