Dridex Office (OOXML) / .XLSM malware analysis — malicious · b06d587c7f838d81

MALICIOUS

Office (OOXML) / .XLSM

797.7 KB Created: 2021-05-10 16:23:30 UTC Authoring application: Microsoft Excel 15.0300

MD5: 856ffbfe5018e77d15fa067420910bf3 SHA-1: 540744290b04a9d1c1b9ef35585169358464a98a SHA-256: b06d587c7f838d81494383503b357cdbffa3304f29a4a1ae0af56a1555df7ead

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 VBA macros, including a Workbook_Open macro that executes code. Heuristics indicate the use of CreateObject and visible LOLBin command execution, likely to download and execute a second-stage payload from one of the embedded URLs. The ClamAV signature also explicitly identifies this as a Dridex downloader variant.

Heuristics 8

ClamAV: Xls.Downloader.TrendMicroDridex0521-9860965-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.TrendMicroDridex0521-9860965-0
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://salvajeglamping.com/wp-content/js_composer_/include/params/animation_style/HMYopU9fekIL.php
- https://archampton.com/wp-content/plugins/kirki/controls/css/Ic6AlDEacA.php
- https://blockeddraincornwall.com/css/skins/blog/webcomic/css/vEufn1n9YA69Je.php
- https://greenbelt-mea.com/css/IYQWLc9dokeSK0.php
- https://wartacitarum.com/wp-content/plugins/jetpack/json-endpoints/jetpack/dP0MPiEN.php
- https://mbbsinindia.co.in/images/O7iFbbtzF.php
- https://meskot.org/wp-content/plugins/litespeed-cache/src/cdn/0Rek020ky.php
- https://sincroniasdelalma-new.srcomputadoras.com/wp-content/themes/twentynineteen/template-parts/content/S1tU7zL7RBAfK.php
- https://plajmarket.com/test/js/masterslider/skins/black-1/jZUAv16TOpcKz.php
- https://www.rebelda.com/wp-content/plugins/cm-pop-up-banners/package/css/utCERekg51.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `8d3f395e8d1ab4554361f3e3414cdb5f9a4c6572bf3d3625aa8257c5f976dea9`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	430854 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` `0b7cbbee344388d4ff34a443c3a881b026a2b8d07ec17058c5a1abc307d8d971`	vba-project	OOXML VBA project: xl/vbaProject.bin	932352 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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