Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d0de52691e87fdb8…

MALICIOUS

Office (OOXML)

41.9 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d9e26e0340013f3d5d9f43634738c36f SHA-1: cfa4959a885061aec0a13322b3d71533aa7bce34 SHA-256: d0de52691e87fdb85568f0aadeb3ba4df780955fe0e69f4663e1bdf2acc6fa0b
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The file contains VBA macros, including a Workbook_Open macro, which is a common technique for initial execution. The VBA code references cmd.exe and PowerShell, and critically uses WMI (Win32_Process) to launch processes, indicating an intent to execute arbitrary code. The presence of a Base64 decoding function suggests obfuscation of a payload or URL. The overall behavior points to a macro-based downloader.

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
8fb00f72d6cde211a95882ab5fa1eb91c4c6fc2d4455bffcedc9380ef804c0ee		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35364 bytes
vbaProject_00.bin
24c9021cc7dbfd33b64cff8b85f5591157fdaf1f212c43ffb8ff9d42949803aa		 vba-project OOXML VBA project: xl/vbaProject.bin 11776 bytes

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