Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 319e7fdd910d469f…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 1773683bc1d78718625ace44ad082c56 SHA-1: 34a6eaaf6624dfb6e4b78ad01c44b531af0a848b SHA-256: 319e7fdd910d469fbc926c40e1fc0d73957a03644a53e0257108e11154c850b1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The sample is an Office document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, suggesting an attempt to execute external commands. The VBA code itself appears to be obfuscated, but the presence of a Base64 decoding function and the overall structure point towards a downloader or initial execution stage for a more complex 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
cead184f83402a43befa1cdf6c79b27a33a354027d7f0671f0b66c685783805e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
cbcc10aa1d2ba7e8cf5228d7faec561b83795e73b0369481337cc1ceb193f6a0		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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