Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 03e433ed4a46feb1…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 857086e11940d937e6166707aeea263e SHA-1: 1a5b2e24e371112866508f5ca28c9447464a16c4 SHA-256: 03e433ed4a46feb165411d076d81a8ec41544d4e1ea5be3d24d0ca27bf344d60
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel document containing a Workbook_Open macro that uses CreateObject to execute obfuscated commands. The macro attempts to download and execute a second-stage payload from multiple URLs, including 'http://sumedhaonline.com/wp-content/HyzNXJ30XQVBSRH/'. The ClamAV detection name 'Xls.Downloader.EmotetExcel02223-9938902-0' strongly suggests the Emotet family.

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
dac791f847c5ba5f7d6afa14eae1e44a14f28493361487fcefd53d0f363c8d99		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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