Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 be7fafeee45efd44…

MALICIOUS

Office (OOXML)

41.9 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4fd88b0b9c2841e95ca6d749b2404cba SHA-1: 64845ec90a45dd979ca6edd2f01e302307cff92c SHA-256: be7fafeee45efd4434e977f7e1fd1f20fda2b0d950cd45902daf6b6815646f3d
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

This Excel document contains a Workbook_Open VBA macro that references cmd.exe and PowerShell. The critical heuristic 'VBA WMI Win32_Process launcher' indicates that the macro likely uses WMI to launch a process, specifically cmd.exe or powershell.exe, to download and execute a second-stage 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
bdc090b015776c6001307843361ce0081eda5a1f51637ba37c46d344922e0b0a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35743 bytes
vbaProject_00.bin
ee728dab28e0f615c3eec3227418275944aa06ada0bf56e0b749b520738c81d1		 vba-project OOXML VBA project: xl/vbaProject.bin 11776 bytes

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