Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 9cf4dfdfc123b095…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: db33d9409ce5d34ad59ea92e594b3406 SHA-1: 0b122856983549ef6dcf824fa5deb311327c83ae SHA-256: 9cf4dfdfc123b095d9c1baab36dcbd7de4bf13631f70051b87047335e5cd7ea2
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file is an Excel spreadsheet containing a Workbook_Open macro, a common technique for Emotet. The macro executes obfuscated PowerShell commands, which are designed to download and execute a second-stage payload from multiple URLs. The ClamAV detection name 'Xls.Downloader.EmotetExcel02223-9938902-0' further supports the Emotet family attribution.

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
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
50d54b1aa9f79dcf0490d96098b86cda0d75d95908983b337d4d90bb9bd3d467		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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