Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 7b56738ef9360e8e…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 7b17e5ba24c000f8c3cc9af0ec1798c4 SHA-1: f80dbbde86ee76b6070b98789fc91288d767578c SHA-256: 7b56738ef9360e8e911ecc282b4c5bed71ed8233eb0d818def283fc7e3683ccf
240 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is identified as malicious by ClamAV with the signature Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0. High-severity heuristics indicate the presence of VBA macros, specifically a Workbook_Open auto-execution macro that uses CreateObject to reference Wscript.Shell. The DOC BODY contains commands that construct a batch file, which in turn appears to download and execute a payload from multiple URLs. The VBA script also contains obfuscated strings that reconstruct a list of URLs, likely for payload delivery.

Heuristics 6

  • ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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 macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
faf50200d5a9adeeda00cc1da1bbf8f6abf0317a1e97a58db8ae804ba12ba446		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 13985 bytes

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