Dridex Office (OOXML) / .XLSM malware analysis — malicious · b411a08a3bcb06ba

MALICIOUS

Office (OOXML) / .XLSM

50.1 KB Created: 2021-05-07 12:31:26 UTC Authoring application: Microsoft Excel 15.0300

MD5: e152235de171287f3432b96a06e56221 SHA-1: 61b039d7dba912f284930d1c8997794226da12d1 SHA-256: b411a08a3bcb06ba60468955397956492a926df2927ea6549105fe5424d6188a

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 executing malicious code upon opening. The macro utilizes CreateObject to instantiate Wscript.Shell and MSXML2.XMLHTTP, indicating it will likely download a payload from one of the embedded URLs. The ClamAV detection name 'Xls.Downloader.DridexOffice0521-9863759-0' strongly suggests a Dridex family association. The presence of a Workbook_Open macro and the download functionality are key indicators of its malicious intent.

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://super-menu.it/includes/lib/HTMLPurifier/standalone/HTMLPurifier/wNYWKg4fYdO.php
- https://abgalecontractors.co.ke/wp-content/themes/twentynineteen/template-parts/content/eCcJg9X3R6V.php
- https://lerc.gov.lr/231electricity/editor/tinymce/themes/modern/Z9grXigF03Qy.php
- https://support.groci.co.ke/qxdVqYUTid.php
- https://blog.techdesigners.ir/ytlRUHwAF.php
- https://chefalle.com/wp-includes/sodium_compat/namespaced/Core/ChaCha20/4Uf6CSbEGj3.php
- https://co-deporte.com/wp-content/plugins/revslider/includes/InstagramScraper/DR34CZJP1juKE.php
- https://ncc-services.com/ncc_hr/js/tinymce/plugins/advlist/Qw3HExfj.php
- https://plusify.in/wp-admin/css/colors/blue/LbMOrvuqScsDDYJ.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `f2e7d0ebb85304dd4d9b2b5b0956ffc6678e9838805de4ffe5c7c2750b476f01`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	40866 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` `0ec8fe7fedee38df263e7b6eca32d59a711b3acb3f4876bc0e1e1dc26448f992`	vba-project	OOXML VBA project: xl/vbaProject.bin	252416 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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