Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 56871425b672b6d6…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d635ddc6288451868449cbdd904a1501 SHA-1: 1dfdf1ddfa2669769d7fe177f7ac83dbba57bdf2 SHA-256: 56871425b672b6d6f6150921830c1abfd2ec3d91d280d150c91adc029f50d213
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a VBA project strongly suggest that the macros are designed to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating that it likely decodes and executes a malicious payload. The primary IOCs are the embedded macro file and the VBA project file.

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
5c322d309565c04ab6e27c3c705e0ca66a5a2410d96307bd0a634940be9554a8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
5a97a0ec6f385ff0edde7a72811c7aff8706b7682e1702ffa86d9a43b70e54a0		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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