Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9bdbdfbabdbcf3c7…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: ebc0f9279ac2f139506637e6c35b021e SHA-1: 7050299e3da64772e3d9adfcc16c0c580369be51 SHA-256: 9bdbdfbabdbcf3c7e5e14f2962fc72afcdcecdbccf206ac0b98310083d40fd53
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros, indicated by the 'OOXML_VBA' heuristic. The VBA code references cmd.exe and PowerShell, suggesting it's designed to execute external commands or scripts. The 'Decode64' function implies obfuscated content is being decoded and executed, likely to download and run a secondary payload. No specific family could be identified.

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
2d7e660552f6e9ee0f0fda65db70163487751f4ad7c400a7c6c93ddeede3ca15		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
0e2a4d5c19ac5b12b33ec5a80ce55aabad352dad1db25333469be830e8e6e219		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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