Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 675faccc060cff8f…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 6a44edc0ce08c7ed29687cfccaaab6ee SHA-1: 9cada27fd54d40fee8357a20cd091e40d1cda993 SHA-256: 675faccc060cff8f73fb8c75505d09b8c3e5715d9d0e10ce922e55ed89af3489
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 and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating obfuscation, and is likely used to download and execute a second-stage 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
6e545a9cc518e0a613f4092ffa96c89857e984ac7d30db57f717f2493557d3ba		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
328729f8e8365df344ef528f48630f3311efeafdffcfa33e9335f6d2b8d06459		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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