Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 120bac39417846fe…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3a3d4a7c39952af54db2530874b73247 SHA-1: 70bb9b534c49aa7fe9950239032242562816a751 SHA-256: 120bac39417846fe70a36d6dc19e5f3ac632e1ec0d8abbdbe32823795f438f7e
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 GetObject call and the presence of a Base64 decoding function suggest that the macro is designed 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
976e0c43d8d6dd0eac99f038881c49b28e71888c3f8738d57c76ade53ae806bd		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
96fc2f4dd1ab428f69703582a1b7d47998277c50cd47076d1817e09065a75576		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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