Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4ef65b3644f5e6a5…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: df2fb30a49b1285d4bde816481293e54 SHA-1: 6fc9ccdc730b68d2d01d6c292d1e7721144dacf5 SHA-256: 4ef65b3644f5e6a5d898a23af63402017568684b71339ce8f76801dd9ccb14ea
160 Risk Score

Malware Insights

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

The Excel document contains VBA macros that reference PowerShell and cmd.exe. 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 a payload is likely being obfuscated and then executed.

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
4abbe86d118ea24a1e0d6c7a831091a48dee90b6f01bff598d76a9e517deb2ee		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
dc87bef71dbe91ffe51767ecd2b3519a60e4bda009004060ea1be5f6144c778a		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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