Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c07ddb54ef9b36c8…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: f5e864884064b5bcf8455c3d95dcd572 SHA-1: 5f6d35a7a43694f582c96262c981527758500592 SHA-256: c07ddb54ef9b36c8570c1d621dc03a33332578b381baa1cce8986876ee1e0c9b
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 PowerShell and cmd.exe. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating a likely attempt to obfuscate and download a second-stage 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
a52035469f9532c376bd03a5d75e83d25f43ad00ccd9ea7efe18887023567283		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
5c3e4ab45cb825065df213550aaec553080f71ec874d9bcddae3e1b37d31cc9b		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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