Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b33aaeb5040cb729…

MALICIOUS

Office (OOXML)

42.1 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: b0dfe1737cde35127c7f49ead98b4ec3 SHA-1: b1ea98b5e6dd79f1ac381661df631550637fe04e SHA-256: b33aaeb5040cb7295738b43c097538032a4593ddbe3699d87e86f150333d301c
260 Risk Score

Malware Insights

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

This Excel document contains a Workbook_Open macro that references PowerShell and cmd.exe. The macro utilizes WMI to launch a process, indicating it's designed to execute a secondary payload. The presence of a Base64 decoding function suggests obfuscation of the malicious payload.

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
5f3a92e93939d7dccae1f97e50e03dba7ecffdf27007e2157a73e76d12e67471		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 36363 bytes
vbaProject_00.bin
fcd967528dc8ee35132ea41e93ff821d45c73ef95ff111f858bb8ab8415ec38e		 vba-project OOXML VBA project: xl/vbaProject.bin 11776 bytes

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