Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 558c04952c940e9e…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d6a440aa44221db33832fdf7820f0447 SHA-1: 4e2c31ef810f8885ddc4c508a1fd6857e0522044 SHA-256: 558c04952c940e9e1ff238b37539aa6c1a76ba58df5995055ccf87dc825493fc
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 it likely decodes and executes a malicious payload, possibly downloaded from an external source.

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
81b1edd85701819f2ba14450376a941c6cbad60248c1dfbae774658702b0f59f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
4d31e9c2571d265ded726127422d083669e453803590d96f4f4d62eb302d5810		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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