Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 47776e5d0451b84a…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 1fbcdea1e58e36b92ef1004fe45c7481 SHA-1: 1e52df639f66f5ec4501ef4653e9918f4dbfd46b SHA-256: 47776e5d0451b84a00161ff012c3b7e3a9a797990a65b02dab58d42c1d1d9499
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, and high heuristics 'OLE_VBA_GETOBJ' and 'OLE_VBA_CMD' suggest calls to GetObject and cmd.exe. This strongly suggests the VBA code is designed to execute commands, likely to download and run a secondary payload. The Base64 decoding function present in 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
8f836a8529c1f5675bf4dae95ee13f75e45cebd61a09323092e73ccaa2f421b2		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
2174021954516d68f877290ec8c88c41307e6960e12f57b0ff43d85ccdb56e47		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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