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

Static analysis result for SHA-256 6811e33ed4864eb6…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 6ee11f5fd634a623159cd65150484061 SHA-1: 6323c0d0e89c29c92275d95f39c338663f110a28 SHA-256: 6811e33ed4864eb6cec4a985527b78208ffd816aa1dfda4d77dd912528338666
300 Risk Score

Malware Insights

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

The sample contains heavily obfuscated VBA macros, including a Workbook_Open auto-exec loader. These macros utilize CreateObject and Shell execution to download and run a VBScript payload from a list of hardcoded URLs. The reconstructed URL list is: "http://santoetortilla.com/_baks/tUX9/http://donbaham.com/Home_files/YS0PazYeraes/,http://barnhart-studies.com/eln-images/vggh1nb/http://blut.com/3dtech/jLu8IANnj3gK9WC/,http://zenzebra.net/plath/9Q0DBle/,http://reacorp.net/PhotoGallery/UwRHgceSGbaCeGF/,http://miniflam.com/eln-images/fSwbQUMQxgdwd/,http://marezdecor.com/MarezGallery/SEQxWtpMJ7rAtY0D/". The script also attempts to drop files named 'yhjlswle.vbs' and 'ughldskbhn.bat' to c:\programdata\.

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

Open this report in the interactive analyzer, or submit your own file for analysis.