Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 eeef4c3cb7e3003d…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 606abbb437bc029d768b349ab34e1c91 SHA-1: 2c52af446c8f091d1a929e06ed7e61d172ad6b58 SHA-256: eeef4c3cb7e3003d6f485ebd625451df016223347f6e97cf77bcf696ca3db7f4
160 Risk Score

Malware Insights

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

The OOXML document 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 payload from obfuscated data.

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
3708e1e94b19d6f78c81b106fd95015bf8e6185b27a3f604c63c87d64d5a89fc		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
cd9bf24e0c7b4f5a06e083d108158a6d44d07bfc0d6faa6c7a445bfad2b699a2		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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