Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 6fc41047bc11f815…

MALICIOUS

Office (OOXML) / .XLSM

366.9 KB Created: 2021-03-10 12:58:33 UTC Authoring application: Microsoft Excel 15.0300
MD5: 25e9a6b92afabaadc45bf4b992560bf0 SHA-1: dc8c36ee7b976c59b6296482e23e15ea26e19574 SHA-256: 6fc41047bc11f8152b3d8325985c0559514bf2b78b0aa7281babcfd280b3d9dc
270 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 a Workbook_Open macro, which is a common technique for initiating malicious actions upon opening. The VBA code is obfuscated but includes a GetObject call and appears to be designed to download and execute a second-stage payload from one of the embedded URLs. ClamAV detection further confirms its malicious nature, identifying it as a Dridex dropper.

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://rdebd.com/plugins/revolution/js/extensions/source/hWTXlpz1gFm9b.php
    • https://ieperpetuosocorrosancarlos.edu.co/wp-content/plugins/jetpack/scss/_utilities/OKQBOKFFMZFQ.php
    • https://bazhinov.com/sya/gavan/wp-includes/Text/Diff/OwQTaXsb.php
    • https://desarrollodeapps.mantiztechnology.com/wp-content/plugins/jetpack/3rd-party/debug-bar/FfRGPR7VsPEVLB.php
    • https://davitarmenc.com/wp-content/plugins/jetpack/_inc/blocks/KdgyCbofI.php
    • https://shoppinstores.com/wp-includes/sodium_compat/src/Core/Base64/8MG6T3BxcGwo11.php
    • https://birkett.com.au/include/Base/Modules/Filter/lWSRZmli.php
    • https://srdlbd.com/wp-content/ngg/modules/photocrati-nextgen_basic_singlepic/templates/rkNDOkZ6Zjy4.php
    • https://realestate.gabrieladinca.com/wp-content/themes/Divi/epanel/css/7K4hhY8BXubOEJ.php
    • https://smmmahmetakman.com/own/core/Command/Config/App/TJbcZFU2yU.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
101d447b6c8daf3a675dcd720314c0a8d523f91133e21668f8975de637da74a0		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 17257 bytes
vbaProject_00.bin
4cf6b7ba9290056a464cd6cedaa97e7b4609ab94df8b6d0886df3fccacb445ce		 vba-project OOXML VBA project: xl/vbaProject.bin 72192 bytes
Detection
ClamAV: Doc.Dropper.Dridex-9845759-0
Obfuscation or payload: unlikely

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