Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 914e5062a9c7e661…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3b347c36de951ff7672f5247e413c886 SHA-1: e4c6783388077c9d89fdd6983fb1e7f960bec4f7 SHA-256: 914e5062a9c7e66170ec0889af6ae832673b13ec87e80d06c7318286f63cf4bc
160 Risk Score

Malware Insights

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

This OOXML document contains VBA macros that reference PowerShell and cmd.exe. The critical heuristic indicates a PowerShell reference within the VBA, suggesting the macro is designed to execute a PowerShell command. The GetObject call further supports the idea of dynamic execution. The VBA code itself appears to be a Base64 decoder, likely used to obfuscate a payload that is then executed.

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
e4fd45ae2d213a63b37cb4c7d2c430dd07c5f18e362a901ced30c98e005faede		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
01d199f863b1382ed557350250f2b0718812b6665b49725d3ddbcdb586251f92		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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