Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 62226cb3f1fa5aba…

MALICIOUS

Office (OOXML)

41.7 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: bfc64f50c1f5f1c6f0d82657a0d74818 SHA-1: e36cba2e1c65c186ff364e5869e7b6177550c143 SHA-256: 62226cb3f1fa5aba9a6345fe85b1be1bf044b3dc7be7997a443fb713ab256f5e
160 Risk Score

Malware Insights

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

This OOXML document contains VBA macros that reference PowerShell and cmd.exe. The presence of GetObject calls and the critical OLE_VBA_PS heuristic suggest the macros are designed to execute external commands, likely for downloading and running a second-stage payload. The Base64 decoding function indicates obfuscation is used to hide malicious code.

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
86371852e27b214fa1904f7528192e729358ea563dbed172a8342c025fc1121a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
893ffba9adf6a97451c5ad8918442f21d50383b7d8d273ca67a9875207dcabf4		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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