Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 743f0cf486a9042f…

MALICIOUS

Office (OLE) / .XLS

1.14 MB Created: 2020-03-20 04:46:51 Authoring application: Microsoft Excel First seen: 2024-06-03
MD5: 9c371d8b2af8066ba95955583515d920 SHA-1: 300df703ab849d36c936b190ebbd0b93825a5837 SHA-256: 743f0cf486a9042fe61c3509d89292901a9d7cfa884156394213d13b45e27cc9
242 Risk Score

Malware Insights

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

The file contains heavily obfuscated VBA macros, including a Workbook_Open auto-execute event, which is designed to run code upon opening the spreadsheet. Heuristics indicate the use of CreateObject and ShellExecute, suggesting the macro attempts to download and execute a secondary payload. The obfuscation and auto-execution pattern are common in macro-based malware delivery.

Heuristics 7

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://sites.google.com/view/macrolix/support-me
    • https://sites.google.com/view/macrolix/contact-me
    • https://sites.google.com/view/macrolix/home
    • https://www.youtube.com/playlist?list=PLBtTeeMrAsGN0sDthF8SY59LQFdCNGtVU
    • https://sites.google.com/view/macrolix/terms-conditions
    • https://sites.google.com/view/macrolix/contributors
    • https://docs.google.com/spreadsheets/d/e/2PACX-1vS0zvB7ccaINchgMv1C89cD2FH1lWxRBQktXZU3kjygG1vsJdEA39IrRJto27-mLKdWwtNZdQdV3XwP/pubhtml?gid=1769974068&single=true
    • https://docs.google.com/spreadsheets/d/e/2PACX-1vRdX8xJBlmjFyp2jD5Bhc7Cuw6mQX9qHUAGj4nXQZUgqsHSN9T830eDhQ3qxVwlgeu_8-0MeeaRJKDM/pubhtml?gid=603703799&single=true
    • https://docs.google.com/forms/u/0/d/e/1FAIpQLSc9A8IEqCSSpRBxLKbFEO-n-Lfxirsf05vItgxD-5WQVLbgbw/formResponse

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
070c2b74c6761a508847baa8fa29adf302bf92f27ef2e57a3e2f78e7db804ff1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 283433 bytes

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