Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4994fbe2e935ebfa…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 35f60b5616a8eecd68d4554d11849259 SHA-1: 65e6520ceeaa7cf54f6950b6d891b3e58b20dee3 SHA-256: 4994fbe2e935ebfa8aaa0feefe94d7d39a08c02a9fbb2cbbcd49c60629349576
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 cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating that it likely decodes and executes a malicious payload. The specific payload or its destination could not be determined 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
ef0937cc68ec23afe6b8d9c1719bb2ec0af6620bb18558b7b80a825d40a7bac8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
1e84732f1ec0cb07deaa4d9e5375870a01d731bb9661e423f49e26c60e0d3875		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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