Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 13b201c9642cfdf3…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 05706e27efbc5bf0837cb85c29134143 SHA-1: 5f4f1a10211efbd428c4a726e23a3af18a703e72 SHA-256: 13b201c9642cfdf35b18a60c195fd64379692e9cd10427ce7888e3be5960131d
240 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains a Workbook_Open VBA macro that utilizes CreateObject to execute Windows Script Host, likely to download and run a second-stage payload. The macro attempts to create a VBScript file at 'c:\programdata\tjspowj.vbs' and a batch file at 'c:\programdata\uidpjewl.bat'. The batch file contains obfuscated commands that appear to download content from multiple URLs, including 'http://youlanda.org/eln-images/n8DPZISf/', which is a strong indicator of a downloader. The ClamAV detection name 'Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0' further supports the Emotet family attribution.

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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