Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 87a95b979565be48…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: ac504b06a979e0e1ef951cdf12a300b9 SHA-1: fb9fe27decfcb7cd5ec0c1c6861b55220b88bd1e SHA-256: 87a95b979565be483e34d4be22dfba355706e1ea9553900ce20343ea9e5fee59
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to download and execute a secondary payload. The specific obfuscation and lack of clear URLs prevent definitive family attribution.

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
2d72bc23375f6a591d0b9ac06a66e4ea0439d72391ddf48e608e08ff0dad2fd3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
be11b686f5d79283635fbb248a01ce94f88e630c7e3ae1b3142f7659bcef5c53		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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