Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 828209ff456297f2…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 131a4810df0b3f3a7ae48e5b000692c9 SHA-1: 05230859a6a6c992b6f4cfd12a48004872e8ad74 SHA-256: 828209ff456297f276e4269927522e569ca8dcbca0e81861981832211fed2f11
160 Risk Score

Malware Insights

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

This Excel document contains VBA macros that reference cmd.exe and PowerShell. The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA, suggesting the macro is designed to execute a PowerShell command. The 'GetObject' and 'cmd.exe' references further support the idea that the macro is intended to launch an external process, likely for downloading and executing a secondary payload. The VBA code itself appears to contain Base64 decoding logic, which is often used to obfuscate 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
c7b3591c309fcd19f29d904818030f71e33a61ff6162250c4a9f60e41a34486e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
a5db099309d4a02424f53ed7f1e1e955f884900d3e32066d58bb2f131a13021b		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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