Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 8a3b87ee45812e7d…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 437f048cfae8a73f9847de92e7c0b562 SHA-1: 7cd8fcb0e8af9131f3c0940359fe80f2afbd65e8 SHA-256: 8a3b87ee45812e7dc8cb0bf9137db8c9f2a8d739087189ddf15487586445c383
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample contains a Workbook_Open macro that executes a series of commands. The script attempts to create two files, 'jledshf.bat' and 'tghklsd.vbs', in the 'c:\programdata' directory. The embedded PowerShell command decodes to a Base64 string that includes multiple URLs, indicating a downloader functionality. 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
f35428e55e97ebcc104de1f278ac33c9848f9deb2d2af148c472536a4394c8e2		 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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