dridex — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 8eadc10e91420400…

MALICIOUS

Office (OLE) / .XLS

736.5 KB Created: 2021-01-27 14:44:47 Authoring application: Microsoft Excel
MD5: 8a10a5f0d1902a314ed7a6b2fe9ebbc8 SHA-1: d7be926dd0f72248f51e2fbf1d2f2528f2e87527 SHA-256: 8eadc10e9142040077cfeaf512d15af681c32c78fc70bf21bad4b0b2d02e1b82
288 Risk Score

Malware Insights

dridex · confidence 95%

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

The sample contains a Workbook_Open VBA macro that uses GetObject and Environ calls, indicative of malicious activity. The macro is likely responsible for downloading and executing a second-stage payload from one of the embedded URLs. The ClamAV detection as 'Doc.Dropper.Dridex-9845759-0' strongly suggests a Dridex family infection.

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://garven.ca/wp-content/themes/twentyten/images/headers/S1ica6r44Zet5EG.php
    • https://sistemaautobuses.com/venta/composer/vendor/doctrine/annotations/GcaSht95.php
    • http://uvgirlshostel.indoornavigationuol.com/streetism/uploads/cq13kxveiCCQA.php
    • http://bircesanart.com/wp-content/plugins/yikes-inc-easy-custom-woocommerce-product-tabs/slider/css/Mg7GDe1OyBI5mS.php
    • https://dev.claritycareercounseling.com/wp-content/themes/hexagon/template-parts/footer/IZ07xHMuYU.php
    • https://mail.rigid-group.com/jp/phpformbuilder/plugins/bootstrap-select/dist/3IuERBhaVZsMf.php
    • http://banananepal.com/wp-content/plugins/js_composer/include/autoload/wd9U0zbVKu.php
    • http://fjb2016.com/vendor/topthink/think-image/tests/images/hu608YzHUW.php
    • http://kardekormimarlik.com.tr/plugins/revolution/revolution/js/extensions/xMChkWxBJWgX.php
    • http://13.250.58.157/wp-content/themes/bridge/woocommerce/cart/amaEW6sLbuJ.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
18fba4bba2bbf806073fece4ee5c21e0dba68cc7208eb9c3092421c2fcbd43ae		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 36550 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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