Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7529c967a1e66d21…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: f93c05d130db20c3e6aa654980807289 SHA-1: 233364b7794cb0049b1b30a3868c944cd621cc53 SHA-256: 7529c967a1e66d2123db0f2a3fe8c29182c8c136e69768b173cd5de78717de5e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an OOXML document containing VBA macros. Heuristics indicate the VBA code references cmd.exe and PowerShell, suggesting it's designed to execute commands on the host system. The GetObject call further supports the possibility of object manipulation for malicious purposes. The primary function of the VBA appears to be the execution of external commands, likely for downloading and running 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
a0f6dbeb5c4577f9657d0b0ce35b23ffaa37c00393fee21ed18fc5a8c88e9576		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
3b462f6dea5381c81704a334b6ccad5ae466cad3ac3a8138bca663722877f20f		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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