Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 5b029d35e3b26016…

MALICIOUS

Office (OOXML) / .XLSM

201.4 KB Created: 2021-03-10 12:57:09 UTC Authoring application: Microsoft Excel 15.0300
MD5: afb5ae0f3a9992fdd329d5353d5faf3d SHA-1: f7900c280982426cf5b69c56500e5c1a3bfa3149 SHA-256: 5b029d35e3b26016449753fa274b30071f7e7857b0f07af97d9d0dfed828e581
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 is an XLSM file containing a Workbook_Open VBA macro, which is a common technique for executing malicious code upon opening. The macro uses GetObject and Environ calls, and the ClamAV detection explicitly identifies it as a Dridex dropper. The presence of numerous unknown URLs suggests the macro's purpose is to download and execute a second-stage payload, consistent with Dridex behavior.

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://accounting.drei-s.at/js/custom/LbNhEzls8u.php
    • https://events.mayein.org.ng/wp-includes/js/tinymce/themes/inlite/GZh9IlFfjwVU.php
    • https://rapidolasantamaria.com.co/wp-content/themes/Divi/includes/builder/qN8w26kHlBWBcO.php
    • https://slm.justsomehosting.com/uploads/images/Q0JHHfyvwg.php
    • https://avantgadget.com/ebayinfo/JspCxvFdqrAwxv.php
    • https://richarddesautels.com/wp-content/cache/busting/17/wp-content/OUJmUfSD1zVbZ3.php
    • https://maxmacelleria.it/wp-content/plugins/maxbuttons/classes/controllers/xjEX4px1WvY.php
    • https://missions.tfnemag.com/libs/tinymce/plugins/visualblocks/css/NM00nao1znw3.php
    • https://greatismoney.com/wp-includes/js/tinymce/skins/lightgray/t2u7ycRQ1.php
    • https://srdlbd.com/wp-content/ngg/modules/photocrati-nextgen_basic_singlepic/templates/rkNDOkZ6Zjy4.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
703f311b0d8acd7dd177cde7815dcd95f4e154518c4f771ca4c9d3360334c182		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 17105 bytes
vbaProject_00.bin
19e8766f63da5842a7a36c14021c21de2d981b83985df5dfaad33c470b9d6af0		 vba-project OOXML VBA project: xl/vbaProject.bin 72704 bytes
Detection
ClamAV: Doc.Dropper.Dridex-9845759-0
Obfuscation or payload: unlikely

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