Dridex Office (OOXML) / .XLSM malware analysis — malicious · a4022c45598432b9

MALICIOUS

Office (OOXML) / .XLSM

50.9 KB Created: 2021-05-07 12:33:55 UTC Authoring application: Microsoft Excel 15.0300

MD5: 9b9374b9c4765aff513f1bb798df0750 SHA-1: 6011c5e41b9a16cca71a39fbc280034e5a43b9b5 SHA-256: a4022c45598432b9ed520afccb0e508338be7cee5c07f5e225c0e1192c0efda8

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 critical ClamAV detection and high-severity heuristics for VBA macros, including Workbook_Open and CreateObject calls, strongly indicate malicious intent. The VBA code likely uses CreateObject to instantiate MSXML2.XMLHTTP and ADODB.Stream objects to download a payload from one of the embedded URLs, and Wscript.Shell or rundll32.exe to execute it. This behavior is consistent with Dridex downloader variants.

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://sportsfort.com.pk/wp-content/themes/porto/scss/plugins/cH1xmIuywQD.php
- https://lerc.gov.lr/231electricity/editor/tinymce/themes/modern/Z9grXigF03Qy.php
- https://cartoonist.me.uk/wp-content/plugins/jetpack/scss/_utilities/us1svv7BFHAuE.php
- https://ramdevagroindustries.com/images/blog/WZVRzcoUaXZ.php
- https://sige.net.br/images/features/LPdbPtlR.php
- https://trenerwpoznaniu.pl/classes/tinymce/themes/inlite/config/WjCKp9Cb.php
- https://intecmmesac.com/images/5xK5fW2OdjtD.php
- https://argentinadanza.com/aljalil/pics/galery/100/vNvKtlT1.php
- https://abgalecontractors.co.ke/wp-content/themes/twentynineteen/template-parts/content/eCcJg9X3R6V.php
- https://aaftab.org/wp-content/plugins_/td-composer/td-multi-purpose/css/jPar115kAGV.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `9dd0c6f99175525851ddad0fe96f2c9609ba40b25c289d160774ae4545edbc93`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	45747 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` `c360e00ba75def3a887ec6e914d624787e906896ea2c732553bf44a295831072`	vba-project	OOXML VBA project: xl/vbaProject.bin	283136 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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