Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8872ea8cb8d6f6a2…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: bde8a6fa43dad49b624997405c3bbe2d SHA-1: dbdace64b214442b9841eef188e505681e9cdb26 SHA-256: 8872ea8cb8d6f6a236f36b43960761539b496ec8759f008138134b8e89c4cedb
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 VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating obfuscation likely used to hide a malicious payload or command execution.

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
a893d031c77f65a3bf3a6bc80a2a61d17c0fa62a824ea227ec8cd610b303d29c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
37251a535adc76db0808d3e2dad525f3fb787ec958fa5a0f1bcf3ede6bb95de5		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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