Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 15263ee987dcdae6…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 9997432bae3c29b59bf1266c3d9c9062 SHA-1: 0c52d6ffacec6b0f7e71377b4deb3925241cef26 SHA-256: 15263ee987dcdae6dad28cc2baf637c64929cd693dd6e32e726b5ec2667eb98d
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as malicious by ClamAV with the signature Xls.Downloader.EmotetExcel02223-9938902-0. It contains a Workbook_Open VBA macro that uses CreateObject to execute a batch file and a VBScript. The script attempts to download a payload from multiple URLs, including 'http://sumedhaonline.com/wp-content/HyzNXJ30XQEVcBS RH/', and saves it as 'vbk.dll' in a temporary directory. The script also constructs a PowerShell command to execute the downloaded payload.

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
ae652ae7cd5c8bd93faba8fe0d1c9d12efe485fa97a16ff37e0fcd2233556a1b		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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