Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 d65efdaba33695b0…

MALICIOUS

Office (OOXML) / .XLSM

627.9 KB Created: 2021-05-10 16:23:24 UTC Authoring application: Microsoft Excel 15.0300
MD5: 7ecefc829e40f550fa5dccfe43e383d0 SHA-1: 989780a7bfdc23df35ef19b49b940f5606d13c8e SHA-256: d65efdaba33695b093589491064b11f42061981074b06dfa4e80dbe4f744799f
248 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample is an XLSM file containing VBA macros, specifically a Workbook_Open macro that utilizes CreateObject to execute commands via rundll32.exe. The embedded URLs are likely used to download and execute a second-stage payload. The ClamAV detection name 'Xls.Downloader.DridexOffice0521-9863759-0' strongly suggests the Dridex family.

Heuristics 8

  • ClamAV: Xls.Downloader.DridexOffice0521-9863759-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.DridexOffice0521-9863759-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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://blockeddraincornwall.com/css/skins/blog/webcomic/css/vEufn1n9YA69Je.php
    • https://clinicasdiad.com/muestra/stylesheets/colors/Uoo2UTGxIy.php
    • https://suubis.com/wp-content/plugins/elementskit-lite/modules/controls/eNIIx0qt3Zbnfp.php
    • https://plajmarket.com/test/js/masterslider/skins/black-1/jZUAv16TOpcKz.php
    • https://ibangadignifiedfunerals.co.za/YobHwa5K.php
    • https://navigator.fun/wp-content/plugins/refer-a-friend-for-woocommerce-by-wpgens/public/js/mCB8abRB2.php
    • https://sensor-tek.com/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/bBNTmfXZbIc.php
    • https://archampton.com/wp-content/plugins/kirki/controls/css/Ic6AlDEacA.php
    • https://bay.mx/images/igfx9IW9M8o9.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8f4f54f4a88d384c603973a509107215117e45bcf16c67d494d83486b700cf13		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 431455 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
af159a23c2d1ba1d0c510a7bae2c9468d79293e5b4fec9e72d2f895b86bdd17d		 vba-project OOXML VBA project: xl/vbaProject.bin 916992 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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