Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c1cd84cdd11203f4…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 2d602c9bf545e7a76c0c9517b0e8c2a7 SHA-1: 35f53e369559ba2afa15e2688db96697ffdbbb8d SHA-256: c1cd84cdd11203f4d443ff811e881778f4e91111d0e446e8725336e80496f7be
160 Risk Score

Malware Insights

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

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses the GetObject function. The VBA code appears to be obfuscated and includes a Base64 decoding function, suggesting it is preparing to download and execute a secondary payload. The specific family is not identifiable from the provided evidence.

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
ee4883d489726635d895d11e015a3400a4cc9d3bb066c340733fc0b2e9105d79		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
af2c401a72f37a9a25c75913f1148fb8180581b910912ef71029db82a3e414d0		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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