Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 2bb562d7c4dec9f2…

MALICIOUS

Office (OOXML) / .XLSM

71.4 KB Created: 2021-04-28 11:56:46 UTC Authoring application: Microsoft Excel 15.0300
MD5: 3f24c08d947b62ec0a74edc248b49a79 SHA-1: d998110d30691e8831c8b1c40774dd31f4b0a8db SHA-256: 2bb562d7c4dec9f28217f926887acc35cef204bf0a392d79649afdf64ad6afc1
208 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The critical ClamAV heuristic and high-severity VBA heuristics indicate a downloader. The Workbook_Open macro and CreateObject calls suggest the execution of VBA code upon opening the document. This script likely downloads and executes a second-stage payload from one of the provided URLs, consistent with Dridex downloader behavior. The presence of multiple suspicious URLs further supports this assessment.

Heuristics 7

  • ClamAV: Xls.Downloader.DridexDarkGreen1020210-9905041-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.DridexDarkGreen1020210-9905041-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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 project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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://marquesimoveis.imb.br/includes/MobileDetect/tests/providers/vendors/DK3v5CtVC.php
    • https://backup.apotikku.com/wp-includes/js/tinymce/plugins/charmap/J6zDhPrzNxg.php
    • https://imobiliariavital.com.br/Alert/assents/fonts/ionicons/css/il6dlHYAy3pn.php
    • https://haltrace.com/wp-content/themes/bb-mobile-application/woocommerce/checkout/WHHjxDARlel6.php
    • https://piruflex.com/wp-content/plugins/elementor/modules/admin-bar/YK6drJbl2.php
    • https://devfix.jogjaautoma.com/wp-content/plugins/mega-addons-for-visual-composer/css/font-awesome/4sjwP9yd.php
    • https://kamnahonda.com/wp-content/plugins/wordpress-seo/vendor_prefixed/guzzlehttp/NSEqEJ2bjvebrG1.php
    • https://farmznanie-lichnyj-kabinet.ru/wp-content/plugins/youtube-embed-plus/styles/alertify/YVdpDSou6pw.php
    • https://admin.guavabits.com/includes/upload/0zRvUytFt5.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
2bbbb72abc0629c94705186055baf56eadfe282ee3eea93dc14ed39750957e9d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 10627 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
10be6f54ec47f0c6ac1b72bec7c1dcdcc93b0780cc3e00caf54098ccd776f0c4		 vba-project OOXML VBA project: xl/vbaProject.bin 56320 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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