Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e0e66f4be7eae90a…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: c9496cf46bfbce6683ea2c75b1a97546 SHA-1: 6530975306c49a489a96d973355cfd28cdaa5688 SHA-256: e0e66f4be7eae90ad858e54089a87a291539d51c35b3f3daf53890594c926dbe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. 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 obfuscation of malicious commands or payloads.

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
8be81cc83480def14be13823549b9960c62a57815ac40f747471d211ed712c24		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
9b3de7c6186d2afa844ea679fbb9b3e1056b6379dc3db8e51f873cb836b00216		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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