Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 5d273eacb24d3821…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: c66cc9955efeafd22c6ec4c59bcb90b4 SHA-1: 975557dcb4feb5a3d981cc65f0f8805c77997e45 SHA-256: 5d273eacb24d3821f7cce6f11c3baf5056b2b86cc6f97adec271bab78986efe0
240 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file contains VBA macros, including a Workbook_Open event, which is a common technique for Emotet. The macros attempt to create a Wscript.Shell object to execute commands. The embedded document body contains obfuscated commands that appear to download and execute VBS and BAT files from various URLs. The reconstructed command line includes multiple URLs that likely host the second-stage payload, such as 'http://youlandao.org/eln-image/n8DPZISf/'. This indicates a downloader functionality, characteristic of Emotet.

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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