Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 5c2b431abc70597f…

MALICIOUS

Office (OOXML) / .XLSM

304.8 KB Created: 2021-02-24 12:02:42 UTC Authoring application: Microsoft Excel 15.0300
MD5: 569907b4cb44e8640779f8378ce70882 SHA-1: 6e7c7d923eb22b385df7287fe4e2056570683a10 SHA-256: 5c2b431abc70597f897b995927be0dfcd8d41d1c3a86916236b8215d41c728c1
270 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter T1105 Ingress Tool Transfer

The sample is an XLSM file containing a Workbook_Open VBA macro. This macro utilizes the GetObject function to spawn a new instance, likely to download and execute a second-stage payload from one of the embedded URLs. ClamAV detection further confirms its malicious nature as Doc.Dropper.Dridex-9845759-0.

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://stiri-romania-24.ro/wp-admin/css/colors/blue/kf4L8l0iS.php
    • https://webriplex.com/wp-includes-old/SimplePie/Content/Type/iJpEbgsI.php
    • https://rafeu.com/lhbd/wp-includes/blocks/shortcode/BUleatY4IZ.php
    • https://alapon.pw/wp-content/plugins/classic-editor/js/oZp5DmYq5djUmjR.php
    • https://nietolem.com/wp-content/uploads/2018/01/o7b2z0qnJ3r.php
    • https://phetmantra.nl/img/fotos/aB8EBhAdQ.php
    • https://www.tomobil.online/media/editors/tinymce/js/dSG0mgEidE.php
    • https://amancai.cl/wp-includes/sodium_compat/namespaced/Core/NCoFuFs06.php
    • https://pinpoint-shopping.com/wp-content/plugins/get-your-number/css/LbUV6Ov89T.php
    • https://amlokservicios.com/css/masterslider/skins/black-1/zUitGE0QufRU924.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
918fc48ddee93c8f1c042aa50170ced43878919e9c184dbfe853958735764251		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 13793 bytes
vbaProject_00.bin
67db239576cb31c6d21828de9a3c1db25e2607a63cf811362044d7229169f32a		 vba-project OOXML VBA project: xl/vbaProject.bin 57856 bytes
Detection
ClamAV: Doc.Dropper.Dridex-9845759-0
Obfuscation or payload: unlikely

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