Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 fd575f2dbfab4295…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 14f075ce67228886b856edae9aef65b2 SHA-1: 828a6a8daf7c74f6c15709aa5cce2871db63b738 SHA-256: fd575f2dbfab429502802d33e8875836e852ba9eae6df9ec7b1362d3298f198c
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a Base64 decoding function suggest that the macro is intended to download and execute a second-stage payload. The specific obfuscation and lack of clear URLs prevent definitive family attribution.

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
9b29df9e5a1bd56a38ec1a9db31354400f3c5570d4522c8811820d424b337347		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
4800892924a1c146f7c922e255aa4a865cbbd24d2f826c6b76551e9efe2186dc		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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