Dridex — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 6dd691de8fde4504…

MALICIOUS

Office (OLE) / .XLSX

724.0 KB Created: 2021-01-20 17:09:41 Authoring application: Microsoft Excel
MD5: 4bc306fa5912af1812d9232b6f1c540e SHA-1: c12b752ff9b700aac82b11242c53db061b1f0303 SHA-256: 6dd691de8fde45048114ef90b481ca7160fe39ab182e727b073f3fda3e2f3259
250 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The sample is an Excel file containing VBA macros, specifically a Workbook_Open macro that uses GetObject to execute code. The ClamAV detection and heuristic firings strongly indicate this is a Dridex dropper. The VBA code likely downloads and executes a second-stage payload from one of the embedded URLs, such as http://ayeyi.biz/wp-includes/sodium_compat/src/Core32/ChaCha20/FmrKsoqNJC8lDaL.php.

Heuristics 8

  • 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.
  • 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://ayeyi.biz/wp-includes/sodium_compat/src/Core32/ChaCha20/FmrKsoqNJC8lDaL.php
    • https://dev1.tritschler-wunschliste.com/vendor/incenteev/composer-parameter-handler/Tests/fixtures/Z8w6OKdbYK.php
    • https://cwodi.com/otros/sitepad-data/themes/residency/data/vS5kowmij5.php
    • https://dev.unitedwebgroup.com/jimmychesterfield.com/wp-includes/SimplePie/Decode/HTML/fsbbr2FFDiSdxw.php
    • https://cosm.cc/comments/system/vendor/michelf/php-markdown/OBmIIyNIFdcAb.php
    • http://l2build.co.uk/wp-content/plugins/revslider/includes/framework/ldkA2hJ4Fi.php
    • http://dillondoes.com/Dillon_Does/dillons_website/tutorial_resources/c_tutorials/img/B9rMKewx.php
    • http://skswebsites.com/careerbodhan/wp-includes/Text/Diff/Engine/4O9QyUbS0qoxr9.php
    • http://frnnet.com/public/upload/banner/2015/10-29/NQtSTL6ujCjZA.php
    • http://cydpm.com.pe/wp-content/themes/spaijd11/functions/Tax-meta-class/iGeUAXE4g.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
1b706ecbfef2319ea61f60117437dc21b1881099ae2230b99063576d83b08f3d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 65378 bytes

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