Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7a5127c59d7ba23e…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3ef4932d9c60126b629a484fe8163188 SHA-1: de84d92e4324ca6f5f0a3d5380fa5666fed36e5c SHA-256: 7a5127c59d7ba23e607ff563532d145660e5d4878fd3e00124a4f14b30c16150
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a Base64 decoding function suggest that the VBA code is designed to decode and execute a malicious payload, likely downloaded from an external source. The specific payload or download URL could not be determined due to the truncated nature of the script.

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
55e708d7c235ba3672bcd88185973d9706d20f60e7bc9380bc162d55048004ea		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
c038b50157c2d1bbda47358e1ee934aca69480a2379d83df43b6c92410cf1e06		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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