Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 76735a6b69a9a339…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: d2eddc901c87719d4559b1d278688005 SHA-1: 3e36e953b8cb8830482f5251290a1f34290802dd SHA-256: 76735a6b69a9a339aa22f45250fea88d0aa3341c8b0e04d0f4fbac34c33f526d
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The sample contains a Workbook_Open VBA macro that uses CreateObject to execute a batch script and a VBScript. The VBA code attempts to download a second-stage payload from multiple URLs, including 'http://sumedhaonline.com/wp-content/HyzNXJ30XQEVcBSHR/h'. The batch script is obfuscated but appears to be responsible for executing the downloaded payload. ClamAV detection confirms this is likely Emotet.

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
1cfd4d70491923c72564906c7beaf3dd24ed1efaf4df5156baec62597ae9b86c		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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