Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 6b06bf3d865e5edd…

MALICIOUS

Office (OOXML) / .XLSX

163.8 KB Created: 2021-04-21 12:55:04 UTC Authoring application: Microsoft Excel 15.0300
MD5: 35bdb83445254ac57d3b471b002dca1a SHA-1: 29738a1203c188b3a6d33322e4f7982b0a4e8f66 SHA-256: 6b06bf3d865e5eddab7920e5b00ffefd032b152557e1e74ac3b262909ee20b3a
270 Risk Score

Malware Insights

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

The sample is an Excel file containing an obfuscated Workbook_Open VBA macro. This macro is designed to download and execute a second-stage payload from one of the listed URLs. The critical heuristic 'OLE_VBA_HTTP_DROP_EXEC' confirms the download and execution capability, indicating a downloader or droppper functionality.

Heuristics 8

  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • 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.
  • 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 project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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://successnoregrets.com/__MACOSX/img/VpfxnXS5mMt7.php
    • https://prodigitalize.com/RTg3Z9Jy.php
    • https://guidewire.motifdemos.com/node_modules/three/src/animation/tracks/2aE3jvHY.php
    • https://estakada-team.com/wp-includes/sodium_compat/namespaced/Core/ChaCha20/QAQGF2L95ZrSQVC.php
    • https://enescanplastik.com/dosya/plugins/wp-analytify/views/default/6zOcE70C74.php
    • https://grupo-gessa.com/YvSbL3zjYQ.php
    • https://promocionessostenibles.es/wp-content/plugins/meta-box/css/jqueryui/EAMqn8EBm.php
    • https://trijayatower.com/wp-content/plugins/creame-whatsapp-me/public/css/3hOcD4Ykt.php
    • https://hanoichinesechurch.com/wp-content/plugins/wordpress-seo/vendor/composer/GHJG9xAh.php
    • https://ar.montenegroinvesting.com/wp-content/plugins/contact-form-7/modules/recaptcha/PMGHOKjn8HZhWUk.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9c17d4ebfe5ea39d7a2c4a4183bd0bcdce6a49763c40954a920818fcbf3b9b93		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 8686 bytes
vbaProject_00.bin
04f40a1085008a400d290230fb1501ad3e751adc85bf80c28227415da89ea48e		 vba-project OOXML VBA project: xl/vbaProject.bin 51200 bytes

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