Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 12a79f955f52903d…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 628bae966e64fbe91212bfab466caca5 SHA-1: f270c37c07afe73ee6cc66bdd8a4bc85ccb69a67 SHA-256: 12a79f955f52903d0f9e63ec30b9d75cdb27343531bab8c6c63b8d3ce6e0c2ad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

This Excel document contains VBA macros that reference cmd.exe and PowerShell. The presence of a GetObject call and the obfuscated nature of the VBA code suggest it's designed to download and execute a secondary payload. The VBA code itself appears to be a Base64 decoder, further supporting the payload download hypothesis.

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
b77e47aee4d3270b09bed063d8de3e5e6c89bf017110f44824e79d30591a1788		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
900e70c1b7edda2672c6932e9e2278de72bd26e3e12a5848266af5a478b9beed		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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