Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f4009cf33cb47354…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 75b91c5cc1207648cbbd7c9627a5972c SHA-1: ea12bbae08633b1fbd4dc366ef109f561eaac3ff SHA-256: f4009cf33cb47354c112f2efb0992d10a672e130afbe1589ef20d855da1b7278
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 VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating obfuscation, and likely serves to download and execute a secondary 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
d23af6e48515cec659d60f48c18bfdb5a9039f3d8ea49368739ae85b9f2cc8c8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
db16e7f02fb5da9ceb3aefd84f8ad9140dfb77190195c364d74a8d534b6c21a8		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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