Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 e54e2798f937775c…

MALICIOUS

Office (OOXML) / .XLSM

208.2 KB Created: 2021-03-10 12:55:49 UTC Authoring application: Microsoft Excel 15.0300
MD5: 18bda253da854f2ee726961804cb1d81 SHA-1: 681ce3158dafcc760c247753dfa449e38935275c SHA-256: e54e2798f937775cf8e763c8a57ad5401c273bb4dc5893302796937658762e4c
268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The critical ClamAV detection and the presence of a Workbook_Open macro strongly indicate a Dridex dropper. The macro likely uses GetObject and Environ calls to obfuscate and execute a second-stage payload from one of the numerous unknown-reputation URLs. The document body is minimal and does not provide further context.

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
  • 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://realestate.gabrieladinca.com/wp-content/themes/Divi/epanel/css/7K4hhY8BXubOEJ.php
    • https://imperio.com.np/wp-content/uploads/sites/3/2019/2zk88lv7PP.php
    • https://bazhinov.com/sya/gavan/wp-includes/Text/Diff/OwQTaXsb.php
    • https://onlinequranlearner.com/image/prettyPhoto/dark_rounded/VaSEyaGvq1S3Oe.php
    • https://www.coavce.com/bower_components/ckeditor/plugins/mathjax/dialogs/VoXyU6qmIyE1ilf.php
    • https://ieperpetuosocorrosancarlos.edu.co/wp-content/plugins/jetpack/scss/_utilities/OKQBOKFFMZFQ.php
    • https://srdlbd.com/wp-content/ngg/modules/photocrati-nextgen_basic_singlepic/templates/rkNDOkZ6Zjy4.php
    • https://rapidolasantamaria.com.co/wp-content/themes/Divi/includes/builder/qN8w26kHlBWBcO.php
    • https://accounting.drei-s.at/js/custom/LbNhEzls8u.php
    • https://www.friendlynepaltreks.com/public/admin-vendors/filer/css/themes/L5KqVr5x1UPjtM.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
1674deb9c8084cedb405c882857afaba5f39e428a93fba5f809e237edceac3a1		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 15653 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 109 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
be208975a011c966126c2ef6641a7659995bfc717028d8067c03e33569b1f62e		 vba-project OOXML VBA project: xl/vbaProject.bin 61952 bytes
Detection
ClamAV: Doc.Dropper.Dridex-9845759-0
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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