Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 61f403b6958d0641…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: deb1be652648157b9cd87842d8b95713 SHA-1: d852eb7060aa90a7ab15827ae11c40cc36ec2927 SHA-256: 61f403b6958d06411f2a3c23bc7a9a3c6e56465c3f0d33c1ada99dbbb6f51b78
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

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 are likely responsible for downloading and executing a second-stage payload. The reconstructed URL 'http://sumedhaonline.com/wp-content/HyzNXJ300XQVBSRH/' is a strong indicator of a downloader.

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
805aac381e4170c4dd791c2a23376f8679c60287576629e6da8177da1293ba8e		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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