Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 a7ae6dc09e6e0d3d…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: a5bd4f9e01b024b87c3e5775e2c160d2 SHA-1: f3d00f0dd54ab5ef75c53f615d366504e5fb69ac SHA-256: a7ae6dc09e6e0d3db4e76419880fa92310adb803f83a4227528c836d03d3ae02
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetRed02220-9938909-0'. The VBA macros contain a Workbook_Open auto-execution routine that utilizes Wscript.Shell to create and execute batch and VBScript files. The script attempts to download a second-stage payload from multiple URLs, including a reconstructed URL: 'http://santoertillla.com/_baks/tUX9/,http://donbaham.com/Home_files/YS0PAPzXyeraes/,http://barnhart-studies.com/eln-images/vggh1nb/,http://zenzebra.net/plath/9Q0DBLE/,http://realcourp.net/PhotoGallery/Uw mRHceSGbaCeGF/,http://miniflam.com/eln-images/fSwbQjUMAfGxdw/,http://marezdecor.com/MarezGallery/SEQxWtpMJ7A8ratY/'. The presence of Wscript.Shell and the download functionality are characteristic of Emotet's downloader capabilities.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12808 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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