Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ceaaddef8e5ac4e5…

MALICIOUS

Office (OOXML)

41.9 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 09f9a1a2ccb0fa24e1aad52fd7df0560 SHA-1: aa44aefee46735b700020d6ee406f21dfad21e55 SHA-256: ceaaddef8e5ac4e5d0c5a7d62bc52931a133f1576917368a65567b0c3c76cb76
260 Risk Score

Malware Insights

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

The OOXML file contains VBA macros, including a Workbook_Open macro, which is a common technique for initial execution. The VBA code references cmd.exe and GetObject, and critically, it uses WMI to launch a process. This indicates the macro is designed to execute commands, likely PowerShell, to download and run a secondary payload. The specific WMI call to Win32_Process.Create is a strong indicator of this behavior.

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
9f6d8a81359dcd7b24658cc972895d64a748099261f41c8a958745aadd5399eb		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35346 bytes
vbaProject_00.bin
e47976ecc17214345b7ff173579c1f1bd50076e7c5b37d642b87efeb21433cb1		 vba-project OOXML VBA project: xl/vbaProject.bin 11776 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.