Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 00064adb242ba5a1…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 4fd7ced5b766a62c6e901b9198ff06f5 SHA-1: 770ca819341dcfa00a463b0e2739d485c9d08840 SHA-256: 00064adb242ba5a178665c39c48dba5709e81e8a6ab19304b8cb0e5c5597589d
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The critical ClamAV detection and high-severity heuristics for Workbook_Open macros and CreateObject calls strongly indicate a malicious macro-based downloader. The VBA script attempts to execute a batch file and a VBScript, both located in the programdata directory. The script also contains a heavily obfuscated PowerShell command that appears to download content from multiple URLs, including 'http://sumedahonline.com/wp-content/HyzNXJ30XQVBSRH/', suggesting it's designed to fetch and execute a second-stage payload.

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
51ad06a7c03223e5dc04d78a7b60fcb1dc232a99da13ad0dc2eb502e254c65c3		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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