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

Static analysis result for SHA-256 37a04a7de7132558…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: b2ccb797fefce6b20b3de6f5072c4a77 SHA-1: e19c5efb4e3662d7afda2dcad0048b01143c032e SHA-256: 37a04a7de713255822aa15fecefa1654f4e43178a2628e1b76f5aeb21d22ec3f
280 Risk Score

Malware Insights

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

The sample contains a Workbook_Open VBA macro that uses CreateObject to instantiate Wscript.Shell. This object is then used to execute commands, including writing a VBScript to 'c:\programdata\yhjlswle.vbs' and a batch file to 'c:\programdata\ughldskbhn.bat'. The macro also attempts to download a payload from a reconstructed URL: "http://santetortilla.com/_baks/tUX9/, http://donbaham.com/Home_files/YS0PPAzYeraes/, http://barnhart-studies.com/eln-images/Vcbhg1nb/, http://blute.com/3Dtech/jLu8IAnnj3gK9WC/, http://zenzebra.net/plath/9Q0DBLE/, http://marezdecor.com/MarezGallery/sEQxWTPjA8rAtY0D/, http://realacorp.net/PhotoGallery/Uw m RHceSGbAcGeGF/, http://marezdecor.com/MarezGallery/sEQxWTPjA8rAtY0D/, http://miniflam.com/eln-images/fSwbQjU M AfGxdw/, http://marezdecor.com/MarezGallery/sEQxWTPjA8rAtY0D/". The ClamAV detection 'Doc.Downloader.EmotetRed02220-9938909-0' further supports its malicious nature as a downloader.

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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