Dridex — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 eef479f5835aa898…

MALICIOUS

Office (OLE) / .XLS

710.5 KB Created: 2021-01-13 13:02:25 Authoring application: Microsoft Excel
MD5: 0dc55d9f0ea057357c90243c0efddd9e SHA-1: 7f0fa3b16a4172026b727ee80d8db9138807fbdc SHA-256: eef479f5835aa89881a9b44dd39da8cfb8ba0c82f25064370bdbd76ba32cbdf3
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. It contains a Workbook_Open VBA macro that uses GetObject and Environ calls, indicating it attempts to execute code and potentially access environment variables. The macro likely downloads and executes a second-stage payload from one of the embedded URLs.

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 https://yogiramsuratkumar.com/album/res/contentflow/img/r7QOWIwYj5.php
    • http://linia.rs/css/theme/GSB36ZV2sQVn.php
    • http://nilfotech.com/wp-content/themes/twentyseventeen/template-parts/footer/5nVJ6aVS88.php
    • http://multi-chemical.com/Rvlx1evnUjlGIy.php
    • http://millepharma.com/1/storage/modification/catalog/controller/TuF2Sj1GiNaxO7W.php
    • http://klimmen.com.br/wp-content/themes/one-page-express/customizer/kirki/includes/output/property/fOqqPp4HlYJu.php
    • https://sma.shardanovelty.co.in/vendor/psr/log/Psr/Log/kXNcyAm11boPD0d.php
    • http://sefinancer.fr/wp-content/themes/twentynineteen/sass/blocks/SlyOzj2S7kfU8q.php
    • http://omjeemart.com/ksbmadmin/source/vendor/phpunit/php-code-coverage/Y8z6bnvahXwNw.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
014624c5482bcf5859f29f1c499d9c4cbb690762947ff2fe52879609fea3d444		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 56020 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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