Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 2ea3fd73246b9b9c…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: fefede0150cb87f8328d0a7fa43e072b SHA-1: a6adcdfbb5bff092f4401dd591e141c3de33fe86 SHA-256: 2ea3fd73246b9b9ca7aefffe4b6db922146a7e76aaf28f131227394d4479b652
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

This OOXML document contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute arbitrary code. The presence of a GetObject call further suggests dynamic execution. The macros appear to be obfuscated, likely to conceal the download and execution of a second-stage 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
513278756479eb8b5647236d793cb8aa303854d210c22a1b764660c9e084f7d8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
1534a2bc2a6d42e7f872428170e6f6f9f751484d43aea5e64426833b50709aee		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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