Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 10b32879b2fa0dfd…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 67a6b5516e2751ebd3979a577ff35f2e SHA-1: 532675182b186d8f7e2a3a5e4d93efb8cbf0849c SHA-256: 10b32879b2fa0dfd5ff658ab400182ba0de4ff6c7d53e7b5c088f991bd055e4e
160 Risk Score

Malware Insights

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

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call is also a strong indicator of malicious intent. The VBA code appears to be obfuscated and includes Base64 decoding, suggesting it's preparing to execute a downloaded 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
baf431652e3efc3be07060dc4bd6b7d7a7567c191b30115f8cae9850cf98050e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
f1021af3a2069bf3a441bb9fe37b11522ecd72ebf5206bfb5a01532c5c90ce56		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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