Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d9f90e861b87b9ee…

MALICIOUS

Office (OOXML)

41.7 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0880eef4f412c3512e631ae037f47640 SHA-1: 279bacccca8ee13a295b54cb109e00b1b0f2ec82 SHA-256: d9f90e861b87b9ee5a15b2bb52699d9871d4129e2788eda7a308112b8aa7bcfe
160 Risk Score

Malware Insights

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

This Office document contains VBA macros that reference cmd.exe and PowerShell. The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA, suggesting the macro is designed to execute PowerShell commands. The 'GetObject' call is also a common technique for loading and executing external code. The primary function of the VBA appears to be obfuscated execution of further commands, likely for downloading and running a secondary payload.

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
2862ac61187a7678abd9a9855767b68b08985607a610b09e8a0a86f9f8213920		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
33efee99d876e085cc1fdcbc57ddd78fee26b308eaaf31acde290f07ce5fd816		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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