Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e9157e32da346917…

MALICIOUS

Office (OOXML)

67.7 KB Created: 2012-10-19 22:33:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: c44c8e5c2b7ed4b597557bf12cc279c4 SHA-1: bf99994ffb3cd21635e1ef7f09e773e48068d3c1 SHA-256: e9157e32da346917b0092b432ede9945fa6d86ceccc07e0afa1e33826a3fecab
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample contains a Workbook_Open VBA macro that is triggered automatically when the Excel file is opened. This macro utilizes CreateObject to instantiate a Scripting.FileSystemObject, which is then used to write a file named 'qDialogOptionsCalculation.xsl' to the ALLUSERSPROFILE directory. The script also attempts to establish persistence by creating a registry key at HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy, indicating a downloader or backdoor functionality.

Heuristics 6

  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • 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 project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c065a0e1b57a103f391a45b7ee5d871eca2f15c25c6a346e63139a67aef70fbc		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3875 bytes
vbaProject_00.bin
cc3a7f58d8f05f17f30c9ac563a2e27e6659f46e9957b7057bc422a4f6b9130e		 vba-project OOXML VBA project: xl/vbaProject.bin 16896 bytes

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