Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 11b26e0aafeadadf…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 97acbc7eaee881804b2877519cd84773 SHA-1: ca23b511273f4c2da340af0e7d17a4e74f14eb84 SHA-256: 11b26e0aafeadadfe16e7342668c519e4c6a23a9ce9b5e3775fdb7e461142331
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a VBA project indicate macro execution is intended. The VBA code includes a Base64 decoding function, suggesting obfuscated commands or payloads are being prepared for execution.

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
cfba7def36d5090e75f5d2c7eab445aa3bf284c7978e85b2f84887d5d6a2631b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
b665aabeaa2a236b2492d93f0bb43de853e8eca8a5e2793d527878fb41a482f7		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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