Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e4d5f3c0f8eb21b8…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: e86d98539f350855015bb1a8c06bea41 SHA-1: 3993caf19758622a04e6d1da8eaded8f3f20bf7a SHA-256: e4d5f3c0f8eb21b8a98b5b72f166310016ed6e6da8d9ef54aa4a157d95c972b0
160 Risk Score

Malware Insights

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

The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA macros, and 'OLE_VBA_CMD' shows a cmd.exe reference. The 'GetObject call' heuristic further suggests the macro is attempting to interact with system objects. These combined findings strongly indicate the VBA code is designed to execute commands, likely for downloading and running additional malicious content.

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
5cf180c7a4e343730d6b63999c9a063bb658a47d34d5c9836003db86f6d1e04d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
ae43ca40905ee284b64a1c511f0525553ca7aa090bbaab4c08f1fbba369c9a76		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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