Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 fff423ce75d8bce8…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5fa4c1638bbc2fe1b82a79df3b7d41d6 SHA-1: 275850fcae30319ecf87936828563a65310e1fad SHA-256: fff423ce75d8bce8931e3c16c19c5ca272098ea784483b0d1a77a7df135b273f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to download and execute a secondary payload. The specific obfuscation and lack of clear indicators 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
983c0eda9700784cf2b18f1bf4e059ceb359c80999974b7bf92d09afa9779770		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
4c79b82d3b0d336e6f52bd37de60dd61aa1caa51278047cb59b2df83fe4e9bd4		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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