TrendMicroDridex — Office (OOXML) malware analysis

Static analysis result for SHA-256 a978a7bb7efc4fc1…

MALICIOUS

Office (OOXML)

195.9 KB Authoring application: 14.0300
MD5: bd669e6b5975c64fd7b17ad30a0610d2 SHA-1: c2a4bd5fbbf58e94b34f537e4f0bcf27e08c3d69 SHA-256: a978a7bb7efc4fc131bdc423b0538dab9bfdd45c2944420c71dfc9d77482e53a
102 Risk Score

Malware Insights

TrendMicroDridex · confidence 95%

MITRE ATT&CK
T1218.011 System Binary Proxy Execution: Rundll32

The ClamAV detection and the presence of `rundll32.exe` in the document body, along with multiple embedded URLs, strongly indicate a downloader. The document likely attempts to leverage `rundll32.exe` to execute code fetched from one of the provided URLs, consistent with the TrendMicroDridex family's typical behavior. The embedded URLs are the primary indicators of the second-stage payload's origin.

Heuristics 3

  • ClamAV: Xls.Downloader.TrendMicroDridex0521-9860965-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.TrendMicroDridex0521-9860965-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://adventphilomels.org/wp-includes/sodium_compat/src/Core32/ChaCha20/ecbCQtOlK8wLZzY.php
    • https://multigranos.com.bo/wp-content/plugins/woocommerce/i18n/languages/xRrL7GcQN0.php
    • https://kpleads.com/kpleads.ali/wp/wp-includes/js/codemirror/FA0MND35N.php
    • https://gulfbeautygt.com/images/byaLcZQlkP5.php
    • https://sitonyourassandmakemoney.com/wp-content/plugins/cartflows/theme-support/astra/sOR3qwEjQh3.php
    • https://meaamarelmorshedy.com/cpx_admin/plugins/ckeditor/skins/moono/dla4Okf7bQ3.php
    • https://lifezhonour.com/backup-11-06-2020/vendor/phpmailer/phpmailer/language/kuVnna5b5FX3Hps.php
    • https://wypozyczalnia-dragon.pl/libraries/fof/integration/joomla/filesystem/v566mU4QOL0.php
    • https://smarttechbv.com.br/wp-content/plugins/wp-fastest-cache/css/fonts/5kbCoM4jSnAI.php

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