Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 94783c3bb3671b50…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4432250279180143984263c9b0668c07 SHA-1: 8b20f5a110dc204a113f21bef76c4362e7eaa108 SHA-256: 94783c3bb3671b50705321f86916e7cb3926dfd32f9d54f87c3fe9abe30fee9d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1059.003 Windows Command Shell

The file contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute arbitrary commands. The presence of a Base64 decoding function suggests obfuscated code is being used to hide the malicious payload. The GetObject call is also a common technique for executing code or loading external resources.

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
5495900c5a75beb3a6d270f6170629a96325c5170a0b61942844608c320d24a9		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
7a684fb86d06039d923cc876db96033691b90b350b24618353da61c0446e3344		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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