Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 6096bc655163c70c…

MALICIOUS

Office (OOXML) / .XLSM

436.4 KB Created: 2021-03-03 12:49:05 UTC Authoring application: Microsoft Excel 15.0300
MD5: a85fe4b7cf65b2c28de44c8ba9014fdc SHA-1: 82aa0f75838b6403ad3819ba15b54795f49c442f SHA-256: 6096bc655163c70c043779aaa2b38c245eb21e4968ef5c293985e983a32e1541
270 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The sample is an XLSM file containing a Workbook_Open macro, which is a common technique for executing malicious VBA code. The macro uses GetObject to initiate execution, likely to download and run a second-stage payload from one of the embedded URLs. ClamAV detection confirms this as a Dridex dropper, a known banking trojan family.

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://coref.cd/wp-content/uploads/2016/10/5tBsg4akOUWz3V.php
    • https://bemcorretora.com.br/plugins/system/redirect/form/KwFU4O19UGo.php
    • https://hopefamilytrusts.org/wp-includes/SimplePie/Content/Type/AVa3B5ouSUX.php
    • https://nawelchile.cl/wp-includes/js/mediaelement/renderers/MCrl62OeS0ZQfmI.php
    • https://ingeconst.cl/wp/wp-includes/rest-api/endpoints/dTEo1JADIXXhd.php
    • https://videoempresazaragoza.com/wp-content/uploads/2018/02/dHT8565U.php
    • https://century21.empov.ct5kh.com/img/back-img/jVc6HWYRU1kkzNT.php
    • https://vertcompany.com.br/wp-content/cache/wpo-minify/1613141973/QwlvahpVhQ.php
    • https://hotelarcane.com/wp-admin/css/colors/blue/HzdRJ0h1.php
    • https://new.bombill.com/B2B/js/public_html/new.bombill.com/QeFqXRXal.php
    • http://www.w3.org/1999/XSL/Transform

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8106a1d8222679c49538cda2993b54811c1a5a1758af46602f8ef2462e511b93		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 13134 bytes
vbaProject_00.bin
ae68acbe6cb2b41ef0a016a442e505a2b014616c2e93631efb5dfdf629d645bf		 vba-project OOXML VBA project: xl/vbaProject.bin 59904 bytes
Detection
ClamAV: Doc.Dropper.Dridex-9845759-0
Obfuscation or payload: unlikely

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