Dridex — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 d1109cb43857f479…

MALICIOUS

Office (OLE) / .XLS

736.0 KB Created: 2021-01-27 16:28:51 Authoring application: Microsoft Excel
MD5: 3b9cc50d0a6c1751071d4b0e8756133d SHA-1: 6d59197d1c8e755f53627738fc7de1d6e1e6d4f8 SHA-256: d1109cb43857f4790cbf46160696a104af2219c00218816937a7a1830101d6a7
288 Risk Score

Malware Insights

Dridex · confidence 95%

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

The sample is identified as a Dridex dropper by ClamAV. High-severity heuristics indicate the presence of a Workbook_Open macro that uses GetObject and WScript references, suggesting it's designed to execute malicious code. The VBA macros likely download and execute a second-stage payload from one of the provided suspicious URLs. The presence of obfuscated VBA code and auto-execution tokens further supports this conclusion.

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://fjb2016.com/vendor/topthink/think-image/tests/images/hu608YzHUW.php
    • http://bircesanart.com/wp-content/plugins/yikes-inc-easy-custom-woocommerce-product-tabs/slider/css/Mg7GDe1OyBI5mS.php
    • http://veedverksracing.com/wp-content/themes/colormag/SCSS/footer/eDI5l5E8wU.php
    • https://sistemaautobuses.com/venta/composer/vendor/doctrine/annotations/GcaSht95.php
    • http://socialcollabo.com/wp-content/themes/twentyfourteen/genericons/font/iPyhwKMlMNihVVH.php
    • http://pbotv.tv/wp-content/plugins/sg-cachepress/vendor/a5hleyrich/y8UzX1Zf0ZWtO.php
    • http://uvgirlshostel.indoornavigationuol.com/streetism/uploads/cq13kxveiCCQA.php
    • http://banananepal.com/wp-content/plugins/js_composer/include/autoload/wd9U0zbVKu.php
    • https://kaizenjanitorial.com/wp-includes/sodium_compat/src/Core/Base64/x9OBSIxEAS9H69u.php
    • https://garven.ca/wp-content/themes/twentyten/images/headers/S1ica6r44Zet5EG.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
1c7f9ab6c6e22571328926e68821c1f02727039630d12fe49d5ef3ed8c66b9ef		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 46418 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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