Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 02ea63ac6cc3cf67…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: ad63e707248e363f90f990192cf6cdfb SHA-1: 5c8b2409676a896cdd2de8de42eada979f0f678c SHA-256: 02ea63ac6cc3cf676fe9faf1c2fa2e4e4522ddf7c939a1ff1d8de085e775ba51
240 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as malicious by ClamAV and exhibits high-severity heuristics for VBA macros, including a Workbook_Open auto-execution event and CreateObject calls. The VBA script attempts to download and execute a second-stage payload from multiple URLs, including reconstructed URLs like 'http://youlandao.org/eln-images/n8DPZISf/'. The presence of Wscript.Shell and the creation of .vbs and .bat files indicate a downloader functionality, consistent with the Emotet family.

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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