Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 11fafc693d218dc0…

MALICIOUS

Office (OOXML) / .XLSM

174.5 KB Created: 2021-03-10 12:57:14 UTC Authoring application: Microsoft Excel 15.0300
MD5: 9e7bcabca8db4c9a17f371bdabf420dc SHA-1: efe180ce185bc598ea7a9bfd816f215ed474814b SHA-256: 11fafc693d218dc0d3d71182109670f6f4ec245a720869c0854795eabbc3e1af
330 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is an XLSM file containing obfuscated VBA macros, specifically a Workbook_Open auto-execution routine. Heuristics indicate it uses GetObject and Environ calls, typical of loaders. ClamAV detection as 'Doc.Dropper.Dridex-9845759-0' strongly suggests a Dridex variant. The VBA script likely decodes and executes a second-stage payload, potentially using PowerShell, from one of the embedded URLs.

Heuristics 9

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • 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://events.mayein.org.ng/wp-includes/js/tinymce/themes/inlite/GZh9IlFfjwVU.php
    • https://richarddesautels.com/wp-content/cache/busting/17/wp-content/OUJmUfSD1zVbZ3.php
    • https://titan-no1.com/files/ck/_thumb/file/quick-folder/jXhrTKCM6wEoy.php
    • https://vivianenadeau.com/wp-content/cache/object/24/9a2/icywrWArgw.php
    • https://missions.tfnemag.com/libs/tinymce/plugins/visualblocks/css/NM00nao1znw3.php
    • http://tecnosystem2000.net/js/jquery/plugins/validate/localization/unKo2pfEUOvrvC8.php
    • https://greatismoney.com/wp-includes/js/tinymce/skins/lightgray/t2u7ycRQ1.php
    • http://almarhoon.com.sa/form/wp-includes/SimplePie/Decode/HTML/LhkK9QjDc8.php
    • https://avantgadget.com/ebayinfo/JspCxvFdqrAwxv.php
    • https://rdebd.com/plugins/revolution/js/extensions/source/hWTXlpz1gFm9b.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
491ad453fdf2861ea804fe526b5564c666dc5cfefcfd451237f9d3f2dd5c9150		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 16955 bytes
vbaProject_00.bin
520bf56c3fa8258f686fb90d88af7a98de7e5b1d932514a490e40dab53cb8629		 vba-project OOXML VBA project: xl/vbaProject.bin 70656 bytes
Detection
ClamAV: Doc.Dropper.Dridex-9845759-0
Obfuscation or payload: unlikely

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