Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d819950ddf5d01cf…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9d4e74531868ef715fb8ce177cecc838 SHA-1: 36c337a602b95a138c4df3a84352c6fe5137f4d7 SHA-256: d819950ddf5d01cfca1d57fad9ac912f86e5736dd572f30b9768a7170758b12a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The OOXML file contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute arbitrary commands. The GetObject call further suggests dynamic execution of code. The VBA code itself appears to be heavily obfuscated, but its presence and the associated heuristics strongly suggest a downloader or dropper functionality, likely initiated via spearphishing.

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
6f6aa21673602c9e58237265e759d896707a87903f90c9112c3f2f07d51d17e9		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
cdad99538ff7786242502c823f380a02fe08c2dd0bca34ddc785bb8e6a701a75		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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