Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b5fe111ed07d939f…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 82516640c01ec9ca231be7044743e070 SHA-1: 7b5c22044b9093ecc405b72ab7cf23a1fc9860ad SHA-256: b5fe111ed07d939f480f9044b4c0184611842d670e7a825643401eba969825c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA macros. Additionally, 'OLE_VBA_CMD' confirms cmd.exe usage. The 'GetObject' call and the presence of a VBA project strongly suggest that the macros are designed to execute commands, likely for downloading and running additional malicious content. The Base64 decoding function within the script further supports the idea of obfuscated malicious code execution.

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
c840d0a1de2675459fa32896b52d54b9e7bdf9b5b2d7b506c001bfef8cd264c8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
67a65ecb08d402e61f99cad8c4a7c6e6a7ccf3f06a63fb908084499aa2811d16		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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