Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a760f38b15b683dc…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: f028c5df915a1cb5a338669687a8c4a1 SHA-1: 0472fd0a7d799cab41bc00975c7d968141fc7aa2 SHA-256: a760f38b15b683dcc6431ed519304f1405246b735b5bb4e309628a88619a144c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The presence of a GetObject call further suggests an attempt to execute external code. The VBA code includes a Base64 decoding function, indicating that it likely decodes and executes a payload. This pattern is commonly used to download and run additional malicious content.

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
4431b8559c3b302ffd129d719371e914c76e8f5d05914458df3f52ab54edfb4d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
a2c7077629aeb8d99e4d3ea53b90dfbe4f6d397221064e4c8890511e1793d9a3		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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