Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c592ae0ee12a5857…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 85866dfc651ef38e0e825a1a7846b1b9 SHA-1: 47187b3a6c0be75bb20194048bc7b6987ada4ea0 SHA-256: c592ae0ee12a585796d5d687b38e28bca2c7a6917e1c1cfd7feaa8113b7998fb
160 Risk Score

Malware Insights

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

The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA macros, and 'OLE_VBA_CMD' shows a cmd.exe reference. The 'GetObject call' heuristic further suggests the macro is attempting to interact with external objects or processes. These combined findings strongly suggest the VBA code is designed to execute commands, likely to download and run a secondary malicious payload. The Base64 decoding function present in the script further supports this, as it is commonly used to obfuscate malicious 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
e92d245e6642d29089029e75e3a66ae22ffe1369f79f6d67acce6247b772af60		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
cbcfc5aadb86c532a92aac08758a637c9e3c6bc675e26867f92de62cd3d77a21		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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