Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 7f6f8cac8acc2eca…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 085fc72266c43f112a471b8662b17853 SHA-1: 52efe51f653890641e8567cca5d13b924d59f48f SHA-256: 7f6f8cac8acc2eca69bd3a667b178239a39220f206e0fa745515e97bc679b3b5
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The file contains VBA macros, specifically a Workbook_Open macro, which is a common technique for Emotet. The macro uses CreateObject to instantiate Wscript.Shell and then executes a batch file. This batch file contains a long, obfuscated string that appears to be a list of URLs from which a second-stage payload is downloaded. The ClamAV detection name also strongly suggests Emotet. The VBA code also contains a MsgBox with Korean text, which is a common lure in Emotet campaigns.

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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