Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 19f4ed0afb3ac47d…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 2c56840f0e0237d322212aeba35f2738 SHA-1: cc8f2f9c5c2abf242b91f910bf3c0950a1b666a7 SHA-256: 19f4ed0afb3ac47d3fff6a0669c5261c01a258fbd5e1c35f997fd42caad0fcc2
160 Risk Score

Malware Insights

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

The OOXML document 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 indicators 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
dc65d5a601fde5de75bde3192a34b4feb25729f23ab7b6fbaa2afe96d75f1ded		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
2201d1dd5fe67d5fa201c5055357cce9c340a7689b59bce028b66701c5958326		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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