Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 7ba635faa7d7eaee…

MALICIOUS

Office (OOXML) / .XLSM

220.4 KB Created: 2021-05-07 12:31:57 UTC Authoring application: Microsoft Excel 15.0300
MD5: dfd7b3375007baa702f9b8a3fa0cf00e SHA-1: e982fe1f9074ebd761784a0f3f0ab8f7a5173ace SHA-256: 7ba635faa7d7eaeedfea10c6db6f86869fa01f3b8688acd59d1d0885ce68f57b
248 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an XLSM document containing a Workbook_Open macro that utilizes CreateObject to execute commands via rundll32.exe. This macro is designed to download and execute a second-stage payload from one of the numerous embedded URLs. The ClamAV detection and the presence of VBA macros strongly indicate 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://aaftab.org/wp-content/plugins_/td-composer/td-multi-purpose/css/jPar115kAGV.php
    • https://sige.net.br/images/features/LPdbPtlR.php
    • https://buyjointsonline.com/wp-content/plugins/wpforms-lite/templates/emails/pM44c3eiAK6.php
    • https://co-deporte.com/wp-content/plugins/revslider/includes/InstagramScraper/DR34CZJP1juKE.php
    • https://argentinadanza.com/aljalil/pics/galery/100/vNvKtlT1.php
    • https://ctfiladelfia.projetosestruturais.com/LR7u0G1zGjUJ.php
    • https://support.groci.co.ke/qxdVqYUTid.php
    • https://super-menu.it/includes/lib/HTMLPurifier/standalone/HTMLPurifier/wNYWKg4fYdO.php
    • https://natalierosenberg.com/wp-content/plugins/jetpack/images/apps/4dyIrpZd9bMQ.php
    • https://sezencin.com/ozzzpanel/js/mylibs/forms/uploader/864sv4ph.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
f6875c5572205391eb0dbaedca722d5c074a90081b0a9ea9f4fcc4307559799c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 43580 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
cfc945b630f532b89ae1ae99ca07db7bdbff0c74565412aef2d13a8be9ad5ff2		 vba-project OOXML VBA project: xl/vbaProject.bin 273920 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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