Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a5676a9c3291bce5…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 7fe55dc61d4012be7b06c749e7f2a3fb SHA-1: 516d268c8c449e3bab3ff431c66d275f7f3305a3 SHA-256: a5676a9c3291bce5b76372cddf2b2aad03f42f4f14a3100aa66be24b22df1d4f
160 Risk Score

Malware Insights

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

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a Base64 decoding function suggest the macro is designed to download and execute a secondary 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
39faa9094764a69dca697dc3f2380c68a96654a5e5105a649450254071e63e9f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
ee2abfec143b4930d696790413e287351b0bb72f619fbe3225b4fda770e31913		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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