Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5c4fb234bc267d9b…

MALICIOUS

Office (OOXML)

41.7 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 1836ee510461f088683ad6906a746b91 SHA-1: fdd2ee83d17b17adaea57c1adc53e18e3091f24d SHA-256: 5c4fb234bc267d9b495af158c9d25b407eb0e98d4bf3b894488066a9b53859f8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA macros, and 'OLE_VBA_CMD' shows a cmd.exe reference. The 'GetObject call' heuristic further suggests the macro is attempting to interact with external objects or processes. These combined findings strongly suggest the VBA code is designed to download and execute a secondary payload, likely via PowerShell or cmd.exe, which is a common technique for initial execution and further compromise.

Heuristics 4

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • 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
08709dfc0a6dbd5cef46a0b006c4a80f587d3e65791dbc41bd3a31d98f764a14		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
ee87d279fc9049b71f56b0a1497979f649e87f6090b02d48f3ae80c13e02f38b		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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