Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3d3f63cb6aee128b…

MALICIOUS

Office (OOXML)

68.0 KB Created: 2012-10-19 22:33:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: 88ab614bd08427818dce6cace22d0484 SHA-1: 57220d144508d7125f3db87792573b0421953e33 SHA-256: 3d3f63cb6aee128b0dccad8897f05fda3a8c6258fd29da70b4932e0f1b18cb15
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1547.001 Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder T1037.005 Boot or Logon Autostart Execution: Scheduled Task

The sample contains a Workbook_Open VBA macro, which is a common technique for executing malicious code upon opening an Excel document. The macro attempts to create a scheduled task using the 'Schedule.Service' COM object and writes a file named 'qClipboardFormatSYLK.xsl' to the ALLUSERSPROFILE directory. This indicates the sample is designed to download and execute a second-stage payload, likely for persistence or further compromise.

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
b4e8c6610856c6b1e11be630072c5cbf4f86b4737bb00682c697f1d2cb9fdb9f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3692 bytes
vbaProject_00.bin
21e9e4cdbe6db55436045658fb3c6083e7bd32beaab09695485debd534552a92		 vba-project OOXML VBA project: xl/vbaProject.bin 16896 bytes

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