Dridex — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 4b365dadb8a5d68b…

MALICIOUS

Office (OLE) / .XLS

727.0 KB Created: 2021-01-13 13:30:48 Authoring application: Microsoft Excel
MD5: c84236e6997a25861e15d5d44a7d207e SHA-1: f4b0cad4dfa47c8ce6feaaeea3ee3ef79708ffe5 SHA-256: 4b365dadb8a5d68b5ff999a1b5991aa0cad00852e0ed7517c4748ecc5f402558
288 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The critical ClamAV detection and high-severity heuristics for VBA macros, including Workbook_Open and GetObject calls, strongly indicate a malicious dropper. The presence of a Workbook_Open macro that uses GetObject suggests the script attempts to download and execute a second-stage payload from one of the embedded URLs. The file is identified as a Dridex variant based on the ClamAV signature.

Heuristics 9

  • ClamAV: Doc.Dropper.Dridex-9845759-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Dridex-9845759-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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 http://omjeemart.com/ksbmadmin/source/vendor/phpunit/php-code-coverage/Y8z6bnvahXwNw.php
    • http://napletonvolkswagen.com/M/HF840TfNngNdGR.php
    • https://mpcleaning.com.ng/P0NQTl1AU.php
    • https://www.dropsitelite.it/wp-content/plugins/woocommerce-services/i18n/json/on0rRPN6iWl5uT.php
    • https://abm-it.com/wp-content/plugins/wordpress-seo/vendor/composer/RJiulqq6iCYBeO.php
    • http://multi-chemical.com/Rvlx1evnUjlGIy.php
    • http://sefinancer.fr/wp-content/themes/twentynineteen/sass/blocks/SlyOzj2S7kfU8q.php
    • https://impulsionfood.com/wp-content/plugins/updraftplus/css/tether-shepherd/ipaO64BN.php
    • http://pidebh.com/wp-content/plugins/woocommerce/src/Admin/ldaoxOBdp.php
    • http://www.sarcars.in/wp-includes/js/tinymce/themes/inlite/Fj1Me7I5aqhuT.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
18c76777c9d8dee2422f1ac64ca3fc45ed7d04ed0f7eb819c72075ab5c220c24		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 63916 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 125 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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