Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 d3acf824cf7ee3d2…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: a0e5d128217f99a089ed03f606e352e8 SHA-1: aedc57562ffaa0d0df2a7a2f6c42550c0ed070d1 SHA-256: d3acf824cf7ee3d2c0c0612234ffab41ccfd32a01de4532c1dcfc163a180f18b
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros, including a Workbook_Open auto-execution routine, which is a common delivery mechanism for Emotet. The script utilizes Wscript.Shell to execute commands, specifically creating and running two files: 'c:\programdata\yhjlswle.vbs' and 'c:\programdata\ughldskbhn.bat'. The script also attempts to download a payload from a reconstructed URL: 'http://fullness-safety.com/-/P6x/-/,https://nabajyotifoundation.com/da8uc7jo/4Za/,http://dwmaster.com/wp-content/eIB2UFY/,http://formula8020.com/cs/56Dzi0P/,https://calad-formation.fr/r3x94z/kgZ9OGCi/,http://lism'. This indicates a downloader functionality.

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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