Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 00510bf34ecaade1…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: c286fa00c39d9a54239bffcb8c194481 SHA-1: 00776a6270a714ffc0f8b0f79a7f13a24429a6c3 SHA-256: 00510bf34ecaade10252ef2bedf5a285255822e90c6244355b68d06f7e500362
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The critical ClamAV detection and high-severity heuristics for Workbook_Open macros and CreateObject calls strongly indicate a malicious macro-based document. The embedded VBA script contains obfuscated PowerShell commands, including a reconstructed URL: 'http://sumedhaonline.com/wp-content/HyzNXJ30XQVBSRH/ ', which is likely used to download and execute a second-stage payload. The presence of Emotet-related indicators further supports this assessment.

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
167c512e17d4bd5520fa8a66aba194fe84fe6f2947dc70be03276c3744126c52		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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