Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 f117e1a03112dd14…

MALICIOUS

Office (OOXML) / .XLSM

219.8 KB Created: 2021-05-07 12:33:01 UTC Authoring application: Microsoft Excel 15.0300
MD5: 6159d7244bef506dda8f78bde652e9db SHA-1: 240a167472f1a8cbddf5b7a44c838f5b8d9cac7c SHA-256: f117e1a03112dd14634d7e0fbc2549f58b59957cb6ff3413675116beacbb753a
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 file is an XLSM document containing a Workbook_Open macro, which is a common technique for initial execution. The macro utilizes CreateObject to instantiate MSXML2.XMLHTTP and ADODB.Stream objects, indicative of downloading a payload. It also contains calls to Environ() and references to rundll32.exe, suggesting potential environment variable access and command execution. The ClamAV detection name 'Xls.Downloader.TrendMicroDridex0521-9860965-0' strongly suggests a Dridex variant. The embedded URLs are the primary indicators for the second-stage payload.

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://impulscentar.rs/wp-content/plugins/litespeed-cache/css/fonts/2KIOjQN9JSF.php
    • https://lindcredit.com/bundles/easyadmin/images/flags/RgVQBNfOa8HZ1ew.php
    • https://firsthand.ng/wp-content/plugins/woocommerce/src/Admin/ZD21U3Bx6LCk.php
    • https://lerc.gov.lr/231electricity/editor/tinymce/themes/modern/Z9grXigF03Qy.php
    • https://radiotupa.multsis.com.br/4uGJ27Vj5.php
    • https://buyjointsonline.com/wp-content/plugins/wpforms-lite/templates/emails/pM44c3eiAK6.php
    • https://wapi.woohooads.com/u1KFrb70e421R.php
    • https://trenerwpoznaniu.pl/classes/tinymce/themes/inlite/config/WjCKp9Cb.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
f5b5db907fa144bd377315e6cc27a0c3dd850a62848ec0705238de176d10dc79		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 41995 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
0eec56fa4ff47b9a1013805f7fdb736577f5a6d07287de49613eb009678eec34		 vba-project OOXML VBA project: xl/vbaProject.bin 261120 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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