Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 303f20c5b48de4c3…

MALICIOUS

Office (OOXML) / .XLSM

3.80 MB Created: 2021-05-10 15:55:45 UTC Authoring application: Microsoft Excel 15.0300
MD5: 5d9f5c048fc1a86ea4b9a6f06e8b3ead SHA-1: 8e5e217d30505c2f54eb5c0278358840d54fda13 SHA-256: 303f20c5b48de4c343f3445e9615ec1f4635ead29aaa1c57271334dbaf0a1894
248 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1218.011 Rundll32

The sample is an XLSM file containing a Workbook_Open macro that utilizes CreateObject to execute commands via rundll32.exe. The embedded URLs are likely used to download and execute a second-stage payload, as indicated by the ClamAV detection name 'Xls.Downloader.TrendMicroDridex0521-9860965-0'. The presence of VBA macros and the execution of external commands strongly suggest a downloader functionality.

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://tseboprocurement.co.za/inc/phpmailer/test_script/images/_notes/E3KYpyHWeU.php
    • https://test651.estore.vlinkhosting.com/QhX2IwPp5Tsl.php
    • https://s3solutions.ae/d6dCRQeJGD00Os.php
    • https://attendance.ehazira.com/bower_components/ckeditor/plugins/tableselection/styles/wCNDv2F8E.php
    • https://consultoriaemimpermeabilizacao.com/wp-includes/js/tinymce/plugins/charmap/SUn668N8oHZI.php
    • https://salvajeglamping.com/wp-content/js_composer_/include/params/animation_style/HMYopU9fekIL.php
    • https://meskot.org/wp-content/plugins/litespeed-cache/src/cdn/0Rek020ky.php
    • https://archampton.com/wp-content/plugins/kirki/controls/css/Ic6AlDEacA.php
    • https://ibangadignifiedfunerals.co.za/YobHwa5K.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ad554bb65abd6e03e18ce7a67989fd75aaec228aec7a7283345248dce9065747		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2701513 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
8debc45a029f14d8fb86fb38436a02e0d6448d814da30a82f1e949f0512fe1bc		 vba-project OOXML VBA project: xl/vbaProject.bin 5491200 bytes

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