Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 955774e28196cff1…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: bce94db5063aef6aa35df4e8843d1ecd SHA-1: ef4249e19ecbeb15d71226707f2d6c4ee85d68b8 SHA-256: 955774e28196cff1473052b1eea2c5a7618a2e85632400ca57ecdb091c21c2a9
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 VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating that it likely decodes and executes a payload from obfuscated data.

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
c5ad6ffee422af8e7d1a22d327501e90cfd8d6b68c43640c2ea4aa97c5e23cf5		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
59f561cac062073c624907290142f9d3a29a43c4c056e8206bc89ee8b7cd067d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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