Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4879b21607479aa6…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: e9bd066a1a861fefc959f86a82f1d047 SHA-1: afe33520868c43caff270e392475cb09898092c3 SHA-256: 4879b21607479aa673aa96be9eab48ebf66e5d8c12ac619df0eecd79eac920f3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell

The sample is an Office document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, suggesting an attempt to execute external commands. The GetObject call further supports the possibility of object manipulation for malicious purposes. The VBA code includes a Base64 decoding function, likely used to obfuscate malicious commands or URLs.

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
9160d31f95b43f7db6fb5fb39276ba2e3d288986ec2a7f26a0e86868b7537216		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
39ef5b4a37638db64e20478fc22f7c2d28ed64d6a4c90bc65c2ad14032a37175		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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