Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4f7283382201176c…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0e3738088d0155c44372d261255503be SHA-1: c93d8b434b60238e8d262d6fe17525c5ce80e4a5 SHA-256: 4f7283382201176c79f0f136eacc4d92790e4abfc7a075bf3aab3f2ed6ad240e
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 OOXML file contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a VBA project suggest that the macros are designed to execute commands or download additional malicious content. The VBA code itself appears to contain obfuscated Base64 decoding logic, further indicating a downloader or stager.

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
bf8f3dba244bf4663a3dcdde76bbadba9bf383293027ceb4db75b3057fb7d204		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
f7b35aa901a86b401606287433cbd210314acdd84546786e6779116bb4724082		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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