Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d3ef12f902fe9d91…

MALICIOUS

Office (OOXML)

41.9 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: c308d3eadb76d082aac54ce23c088b59 SHA-1: b840fe93bfdf76f0424affeca0d22e0ce1df4977 SHA-256: d3ef12f902fe9d9142800f60fa37f97fbee4fc77560220d91657935e7384b6a5
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1218.011 System Binary Proxy Execution: Rundll32 T1059.003 Windows Command Shell

The sample is an Excel document containing a Workbook_Open macro. This macro references PowerShell and cmd.exe, and uses GetObject and CreateObject to launch a WMI process. This indicates the macro is designed to execute a second-stage payload, likely PowerShell, to further compromise the system. The VBA code itself appears to be obfuscated, suggesting an attempt to evade detection.

Heuristics 6

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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
ce66abc42c13fa27b4e8f88450c368cf3f931caa85ec3f07ba96e65561a9e736		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35434 bytes
vbaProject_00.bin
b1069a61f392474a615169dcaa8a7f87f772712ab623bf32b8c799b36516d6bf		 vba-project OOXML VBA project: xl/vbaProject.bin 11776 bytes

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