Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ec21044e06c98b1e…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 548f4f40550fd9f133d188dfc75c8712 SHA-1: 69ff1668b004a509ae163a31ce56a2a46d91f1f4 SHA-256: ec21044e06c98b1e089c4dcf7efa2bcf9fc71562974013343afece4ba9988009
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The critical heuristic 'OLE_VBA_PS' indicates a direct reference to PowerShell, suggesting the macros are used to execute arbitrary commands. The 'GetObject' and 'cmd.exe' references further support the execution of external processes. The primary function of the VBA appears to be obfuscated command execution, 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
6568700857a2c01b9029b5d7adc9c620aafa5d86e5c526620944a4844fb4c9ec		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
cbe64ad5e7f5f2235ddbc551670d100763580aa44e0cc2e470fe62414082115b		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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