Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 44752413e83a4cee…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 562adf73d9fc72f867c2765522b8a8ae SHA-1: 1889e0988081da4cd857f033f1b1e40b14f05641 SHA-256: 44752413e83a4cee1eefcbed1de6b13cf72a029dcfff411df431cfa263e83caa
280 Risk Score

Malware Insights

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

The sample contains VBA macros that execute automatically upon opening the workbook, indicated by the Workbook_Open heuristic. The script uses `CreateObject("Wscript.Shell")` to download and execute a VBScript payload from a concatenated URL. The reconstructed URL is 'http://santafetortilla.com/_baks_/tUX9/,http://donbaham.com/Home_files/YS0PAPxYeraes/,http://barnhart-studios.com/eln-images/Vgbh1ng/,http://blut.com/3Dtech/jLuo8IAng3gK9WC/,http://zenzebra.net/plath/9Q0DBle/,http://reacour.net/PhotoGallery/UwRHgceSGbaCeGcFg/,http://miniflam.com/eln-images/fSwbQjU M AfGxgdw/,http://marezdecor.com/MarezGallery/sEQPxWtpMJ7A8rAtY/,http://brogeruschulzt.com/eln-images/u0vT/'. The script also attempts to save the payload to 'c:\programdata\yhjlswle.vbs' and execute a batch file 'c:\programdata\ughldskbhn.bat'.

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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