Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 bd11ed1931483c82…

MALICIOUS

Office (OOXML)

42.3 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 974d9bcb54d7690ee3b52b7377c3ae48 SHA-1: 1d84ec335ed5ad0e6e606e4362cca41729ce2070 SHA-256: bd11ed1931483c820a4327ccd1e34b70257c27e7de1ffcd9f392e1555ca89895
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1137.001 Office Application Startup: Office Application T1059.003 Windows Command Shell

The file is an Office document containing a Workbook_Open VBA macro. This macro references cmd.exe and PowerShell, and uses WMI (Win32_Process) to launch a process. The VBA code is heavily obfuscated, but the presence of these indicators suggests it is designed to download and execute a secondary payload. The GetObject call further supports the execution of external commands.

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
98677c0cca34a6ff887badac95100fa38d1dd246ef8302a6b1550cd1b832f239		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35948 bytes
vbaProject_00.bin
e26fdda45d85e3c871f39da974f52cb9e9275d3aa184bfa32ca9baf43b9ce983		 vba-project OOXML VBA project: xl/vbaProject.bin 11776 bytes

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