Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 5f31544e0e397153…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: f550295f270e6666aa6f8e8e68410013 SHA-1: eb3a888baade19a93f5bdf7005e9f1309759011e SHA-256: 5f31544e0e3971536c6e883898113e95c6813ea384c4f0319e22a62459fb86b5
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is an Excel document containing a Workbook_Open macro, identified as Emotet. The macro uses CreateObject to execute a batch file located at 'c:\programdata\jledshf.bat' and a VBScript at 'c:\programdata\tghklsd.vbs'. The script attempts to download payloads from multiple URLs, including 'http://sumedhaonline.com/wp-content/HyzNXJ30XQEVcBSbRH/', indicating a downloader functionality.

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
f11f71405fa6ae6c02b13a3c9dc1a4953b795553415adcea9eb9cec2a1873a6b		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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