Dridex — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 749f0d02e40de310…

MALICIOUS

Office (OOXML) / .XLSX

244.1 KB Created: 2021-03-08 16:25:33 UTC Authoring application: Microsoft Excel 15.0300
MD5: 465073cff94c47ab863e5e9a5822c35d SHA-1: be9cb1aa91056bbb4d9b8ad82b43ffdb85dbe36a SHA-256: 749f0d02e40de3105c7086ae9073dd71ea494ab873cc1b32bc4ae25ac72d892e
270 Risk Score

Malware Insights

Dridex · confidence 95%

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

The sample contains a Workbook_Open VBA macro that is designed to execute code upon opening the spreadsheet. The macro uses obfuscated VBA code, including string concatenation and function calls, to download and execute a second-stage payload from one of the embedded URLs. ClamAV detection confirms this behavior, identifying the file as a Dridex dropper.

Heuristics 8

  • ClamAV: Doc.Dropper.Dridex-9845759-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Dridex-9845759-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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 project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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://lweonepal.com/wp-content/cache/object/013/bFPs28xfQyOe.php
    • https://gesky.co.tz/wp-includes/sodium_compat/namespaced/Core/HMJi1PQC.php
    • https://familystory.es/wp-content/uploads/2021/01/InOm7e9u4vMmW.php
    • https://drakarys.rs/img/icons/tabs/xTPpiyC3.php
    • https://slaweskicpa.com/tmp/install_5a4f05d42cc52/install_5a4f05f303fa0/backend/vlvzskOj4To9.php
    • https://dentaldesignstudiowi.com/wp-content/uploads/2021/01/9eFsntMZ.php
    • https://mishpachton.club/wp-content/uploads/2020/01/sULnmh1mel6Ha.php
    • https://leer-afrikaans.co.za/5TdZj0lfsvo.php
    • https://centrodetraduccionespuce.com/intranet_old/css/vendor/square/risWzMrGzRtO4bS.php
    • https://mail.account.inventorybiz.com//X70ySsjm2.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b3cf8b972aef427b189755caf11002967882ff9cb7c5c36cc24baf3664040607		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 15581 bytes
vbaProject_00.bin
fb9f08dc476fb568fe34614fefc7089ecfc6a5bb37b3dd8875e8ab402a40eee8		 vba-project OOXML VBA project: xl/vbaProject.bin 71168 bytes
Detection
ClamAV: Doc.Dropper.Dridex-9845759-0
Obfuscation or payload: unlikely

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