Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9e6403fddff6cde4…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5a00cef1cee72c65d6a660e050d6638e SHA-1: 4dbbf4dddf7ff04a7bd05d53664dd98ed402b510 SHA-256: 9e6403fddff6cde417a32c150c444f21a301218828f771229ceec293d8284035
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

This Excel document contains VBA macros that reference cmd.exe and PowerShell. The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA code. The 'GetObject' and 'cmd.exe' references suggest the macro is designed to execute external commands, likely to download and run a secondary payload. The presence of a Base64 decoding function in the VBA script further supports the obfuscation and execution of malicious code.

Heuristics 4

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c7d09d1c30eff7983b548b21f1e4193e20c8b867d235c29c9395220bea842a96		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
ed10f11215ebdc090b66b88d77c554da35bdb661cc1bb3859763eec62a83960d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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