Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c0d3f4bdf81c42d7…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: b70af076652512c00be1645bc5cd7b1b SHA-1: 28b936f0bd90fdc34d12dcd7c8eafd6dba97c694 SHA-256: c0d3f4bdf81c42d7aa05be8609cfba5e8416ba4a251e8e11cf4cf2fd103d4f74
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 file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references cmd.exe and PowerShell, suggesting it's designed to execute commands on the host system. The GetObject call further supports the likelihood of object manipulation for malicious purposes. The primary function of the VBA appears to be the execution of external commands, likely for downloading and running a secondary payload.

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
6c821933111bb6c8ded8a80956d439e315f147fe2d4497710c805bf769347066		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
1d77995009bb474e1c2c25b6d717913970d006b1db6ac2436351e03ba1ebaaeb		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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