Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 199282adb68e68b8…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: f0014c5cf7848edbb415e29659ce00dd SHA-1: 20ceeecda1bec462f0733ffef9664bebd0e8825e SHA-256: 199282adb68e68b820c26e16efa9502aff6f2ccc1b488bd29fb719d563ace5e1
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

The critical ClamAV detection and high-severity heuristics for Workbook_Open macros and CreateObject calls indicate malicious intent. The VBA script attempts to execute a batch file and a VBScript, which in turn appears to download payloads from multiple URLs. The reconstructed URL from the VBA script is "http://sumedhaonline.com/wp-content/HyzNXJ30XQEVcBRH/ ,http://divachintex.com/wp-incudades/WHhWRKs8KvzNFm6/,http://hotelanmalabo.com/1520/bUd hEpdF/,http://shwenantawin.com/copma/XTnZJi02vfgV". This suggests a downloader functionality, characteristic of 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
930727ed55d5cf9e5eb84f9040d34e332d7a779012d0be2a9f301292fee2865b		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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