Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c61d3860767dbb56…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 638851ffdddbf9dac3c39f46c8f9f671 SHA-1: 9b4ad0f1ffdd00e20916ab5e225000e6ebf4c83d SHA-256: c61d3860767dbb56b26e377dfdce20a5635458380978354c3c3d21efdcf43eb1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

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 a payload is likely being obfuscated and then executed. The primary function of this macro appears to be downloading and executing a second-stage payload.

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
27b17c00cdf66c5f280265e93b69b45edbcd882364841099d0011e614ae30e56		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
357f0ec07be80b060585c43033a5445438999e72ddd728dc7bbacb0d7c33947f		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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