Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 0be886818949b4e8…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 83f16d16ce97988a09616c952b82811e SHA-1: a0162f99bf13dabddcaa3b9685da1e03b2dea939 SHA-256: 0be886818949b4e8495bfb3e46d567fc53d314577c55181015811f03e9279a89
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains VBA macros, specifically a Workbook_Open macro, which is a common technique for Emotet. The script attempts to execute a batch file and a VBScript, and it constructs a complex command line that includes multiple URLs. One of the reconstructed URLs is 'http://sumedhaonline.com/wp-content/HyzNXJ30XQEVcBSrRH/,http://divachintetiles.com/wp-inculdades/WWhWRKs8KvzNFm6/,http://hollandamalabol.com/1520/bUdhEpdF/,http://shwenantawin.com/copma/XTnZiI02vfgV', which is likely used to download and execute a second-stage 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
644290e00be0cdba85b95d69ba70f3e104dc2d7aa5b34867d3f835848e5983d8		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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