Dridex — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 b35170c9fd988aaf…

MALICIOUS

Office (OLE) / .XLS

700.0 KB Created: 2021-01-13 14:06:42 Authoring application: Microsoft Excel
MD5: 4cf5b0510ffa4d4c39ccc5f64cddee8c SHA-1: afbe056da7c6d208dccfb26cadc1112111762903 SHA-256: b35170c9fd988aaf099fc4318dc21c7821aad4c81b9ef860fb0cc95fc08bd822
288 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The critical ClamAV detection and high-severity heuristics for VBA macros, specifically a Workbook_Open auto-execution with GetObject, strongly indicate a malicious dropper. The VBA code likely uses obfuscation techniques to download and execute a second-stage payload from one of the unknown-reputation URLs. The presence of a Workbook_Open macro and the specific ClamAV signature point towards the Dridex family.

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
    • https://pm.marketingnetwork.it/wp-includes/js/tinymce/skins/lightgray/CcV1lWG3FwB1i.php
    • http://farabiit.xyz/sofomart/wp-includes/js/mediaelement/renderers/ZJR1EGiQKMGT.php
    • http://sefinancer.fr/wp-content/themes/twentynineteen/sass/blocks/SlyOzj2S7kfU8q.php
    • https://www.bloggingtag.com/wp-includes/js/tinymce/plugins/charmap/B3w9zcmN.php
    • http://alarmascancun.com.mx/wp-content/themes/vw-security-guard/template-parts/header/dvhW3tqNnyOlf.php
    • https://ivfcyprusglobal.com/ZNRXE31LjKXl.php
    • https://wellnessway.co.za/wp-content/plugins/coming-soon-maintenance-mode-from-acurax/css/fonts/vSoOsa1e.php
    • https://GesDoc.fda.com.pe/wp-content/plugins/members/addons/members-acf-integration/XOIFkw1QtbqgkS.php
    • http://mek-one.com/test/hwdWR7DS.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ff7f816d3f29a2077d4a095fd89008dd96225fb8d1cadf174c20afbe43f35103		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 51771 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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