Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 feac88e4bb74f203…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4183c4bc63982b01f2eee4291124132f SHA-1: 4ba825708fb4ead873eb27a18a548296dc15ccb7 SHA-256: feac88e4bb74f203b2e6613bdb36571d9a065023efb265ea9ee93c691843e008
260 Risk Score

Malware Insights

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

The file contains a Workbook_Open macro that references PowerShell and cmd.exe. It also uses GetObject and WMI to launch processes, indicating an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, suggesting obfuscation of malicious commands or URLs.

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
ce498413e2177fe4c66bf74db8bcbdcd214daad6e0974afb6b02f632c09260af		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35227 bytes
vbaProject_00.bin
e7827878b1a653e6fd07d0a89e169f4ff5dc95a4278e65372308cf0d22ed735d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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