Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 71f5b3403f45e68d…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 9e9b204d919bd9ef19df0896d12de13a SHA-1: 4a2f08e4e7fbabb796e50c3954c8e07b33aed554 SHA-256: 71f5b3403f45e68d1594cc6768ff55c3e609dad243b426c639bacbe2dd814354
200 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as malicious by ClamAV with the signature 'Xls.Downloader.EmotetExcel02223-9938902-0', indicating a known Emotet variant. The presence of a Workbook_Open macro and CreateObject calls strongly suggests the execution of malicious VBA code. The obfuscated commands within the document body appear to construct and execute a PowerShell command to download and run a second-stage payload from multiple URLs, including 'http://sumedhaonline.com/wp-content/HyzNXJ30XQEBSRH/'.

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
c2f0eea71c336bab3bb40451f9d5c29123dd39595300df9a42ce3d1a8876de6b		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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