Dridex — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 bd8b55be218cee85…

MALICIOUS

Office (OLE) / .XLS

786.0 KB Created: 2021-01-13 16:24:06 Authoring application: Microsoft Excel
MD5: 47bd6588a26043dcb77e978040e59f9a SHA-1: 6d59c226abfdb88e1f4fb28dc0f1bc4ff27bb836 SHA-256: bd8b55be218cee85920be13f7e1fbc2b68ac4aa473f8ccc75a2dc815dbfec0b1
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 malicious by ClamAV with a signature indicating it's a Dridex dropper. Heuristics confirm the presence of VBA macros, specifically a Workbook_Open auto-execution macro that uses GetObject and references Windows Script Host, suggesting it's designed to download and execute a second-stage payload. Several unknown reputation URLs were extracted, likely serving as the payload source.

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://linia.rs/css/theme/GSB36ZV2sQVn.php
    • https://abm-it.com/wp-content/plugins/wordpress-seo/vendor/composer/RJiulqq6iCYBeO.php
    • https://cjombogo.com/edenlingerie/wp-content/themes/kallyas/Licensing/VxXWED2rFvEA.php
    • https://holylandblessing.com/css/font-awesome/css/micons/fonts/H3yKJwPPyD.php
    • https://orzelconsulting.com/tabo/wp-includes/Text/Diff/Engine/zxZqMg7MRwiAqm.php
    • https://www.dropsitelite.it/wp-content/plugins/woocommerce-services/i18n/json/on0rRPN6iWl5uT.php
    • http://kurdcoding.com/RokUoZsNpAt8mc.php
    • https://travelspyders.com/wp-content/plugins/cartflows/theme-support/astra/ZaUT8RbcNuB7.php
    • http://adsofonline.com/wp-includes/js/tinymce/plugins/charmap/SdmAPGR17.php
    • http://bachelor-bdx.net/E5LZUwzOG5MJ.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
6fd1026192b84ced4cf85c7c14f6d9c1cbfb064b890708536be4a3d6d20e5949		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 39142 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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