Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b7d9826630d90291…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: c68f0a25d02fe3edf557c11464b546be SHA-1: 4934c100487802f67e2311141b3133f025861f5f SHA-256: b7d9826630d902917018787f0a7e1a3c892cb16c8d9faed37cbf9ffee7e04751
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 cmd.exe and PowerShell. The presence of GetObject calls and the obfuscated nature of the VBA code suggest it's designed to download and execute a secondary payload. The specific family is not identifiable from the provided evidence.

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
2cd310a2ebd2f7f5772330b7b0f28a4d49783172512c50841e30ee38cffcc9a9		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
bab937fdb7f75c6266f6d3d5ad4d9e8f32d70e8d6549c260dd201686fba37aa8		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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