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

Static analysis result for SHA-256 1148fb154fdaaed7…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 3fa95f442ee4eb61cad8b969b355efa3 SHA-1: 556ecd625d567a6b072096825548f9dd8de74777 SHA-256: 1148fb154fdaaed777e2dbe68d893bf7c3e3d9282f19126f6d8fdecc5e69305b
300 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains an obfuscated VBA loader within a Workbook_Open macro, indicative of a downloader. The script attempts to download and execute a second-stage payload using a reconstructed URL: "http://santoetortilla.com/_baks/tUX9/http://donbaham.com/Home_files/YS0PPAZcyeraes/,http://barnhart-studies.com/eln-images/vggh1nbcEGBaCEGF/,http://blut.com/3dtech/jLu8IANnj3gK9WC/,http://zenzebra.net/plath/9Q0DBle/,http://marezdecor.com/MarezGallery/SEQxWtpMJ7A8rAYt/". It also attempts to drop files to 'c:\programdata\yhjlswle.vbs' and 'c:\programdata\ughldskbhn.bat'.

Heuristics 7

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • 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.
  • 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

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