Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 26240e7ab3938d60…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 03fdec0f9cde90c62428b2c9cd5c9438 SHA-1: e7f0121626b586246972326973e8697b6e2966e0 SHA-256: 26240e7ab3938d6037937db78062ada771566439df4faece1cbce89821570bb1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an Office document containing VBA macros. Heuristics indicate the VBA code references cmd.exe and PowerShell, suggesting it is 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
2b5b867b0eea9b10e4da3509c5f1d2c3f6f7a014ea2165d578a64771e27c2202		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
75dbe28d05990c45a9983becbf71a967ec3628064926e643bc1caa7f38b9c12e		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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