Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 3bac087ceb5e8940…

MALICIOUS

Office (OOXML) / .XLSM

49.4 KB Created: 2021-05-07 12:32:46 UTC Authoring application: Microsoft Excel 15.0300
MD5: eed1b97bc3b303237691612c52f8e003 SHA-1: 2dc21050426404b4a4ae370fb536f4c2520fae03 SHA-256: 3bac087ceb5e8940c55d5c3b83bf2f7292a488f1c847bbdcf1ab046832386b6e
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 a Workbook_Open macro, which is a common technique for initial execution. The macro utilizes CreateObject to instantiate objects like MSXML2.XMLHTTP and ADODB.Stream, indicating it's designed to download and save a file. The presence of 'rundll32.exe' and the embedded URLs strongly suggest the macro's intent is to fetch and execute a second-stage payload. ClamAV detection further confirms its malicious nature, identifying it as a Dridex downloader variant.

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://ammarakhizerkhan.com/wp-includes/sodium_compat/src/Core32/ChaCha20/Dn7zOdqooZVw.php
    • https://plusify.in/wp-admin/css/colors/blue/LbMOrvuqScsDDYJ.php
    • https://natalierosenberg.com/wp-content/plugins/jetpack/images/apps/4dyIrpZd9bMQ.php
    • https://trenerwpoznaniu.pl/classes/tinymce/themes/inlite/config/WjCKp9Cb.php
    • https://impulscentar.rs/wp-content/plugins/litespeed-cache/css/fonts/2KIOjQN9JSF.php
    • https://lerc.gov.lr/231electricity/editor/tinymce/themes/modern/Z9grXigF03Qy.php
    • https://theaccentchairs.com/wp-content/plugins/woocommerce/vendor/automattic/rWohwKVhOY7IPnR.php
    • https://certifica.app.infoweb.boatcover.org/dt_091901820028/condivise/immagini/icone/icone-default-on/2NJsNm1KQuTMMVo.php
    • https://cartoonist.me.uk/wp-content/plugins/jetpack/scss/_utilities/us1svv7BFHAuE.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
42839308655392b470ece85001350af75464f485180be7a838f9d99caea722eb		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 41077 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
2a8e6db13616dc3941677fb77e270f7d7cb1d867ac515e3066098f83e27262de		 vba-project OOXML VBA project: xl/vbaProject.bin 257024 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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