Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b7855bb08b06c200…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 03cd3b36e780488219be60c95ab587f6 SHA-1: 5975b681728ada9857f39c511addb5c3198a68d7 SHA-256: b7855bb08b06c200002567ec1c5262f03e2c3e3c6ff963f0539bf86e101a241b
160 Risk Score

Malware Insights

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

This Office document contains VBA macros that reference PowerShell and cmd.exe. The presence of GetObject calls and the critical OLE_VBA_PS heuristic suggest the macros are designed to execute external commands, likely to download and run a secondary payload. The Decode64 function indicates potential obfuscation of malicious code or URLs.

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
f744232316a848b4863fdfbc1b0d65de01652f1aa56ccff4adfae76edf2fe1c3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
fd4fb9a8ab22bbf041585038878ae9fca761a6391a4f85e647331ff029ec84a0		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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