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

Static analysis result for SHA-256 48ecacf0baf4735f…

MALICIOUS

Office (OOXML) / .XLSM

214.5 KB Created: 2021-05-03 13:18:48 UTC Authoring application: Microsoft Excel 15.0300
MD5: d85f992b4b734d029e3ef75f4b150f1d SHA-1: b8e2427edb8fe9749254f8f07e1d3db4e7607fbe SHA-256: 48ecacf0baf4735f4e9f753cb6d1450b9f840f72532e582885d85637049440bc
308 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1218.011 Rundll32 T1105 Ingress Tool Transfer

The sample is an XLSM file containing a Workbook_Open macro that utilizes WScript.Shell and CreateObject to execute commands. The presence of 'rundll32.exe' and multiple embedded URLs strongly suggests the macro's intent is to download and execute a second-stage payload. The ClamAV detection as 'Xls.Downloader.TrendMicroDridex0521-9860965-0' further supports this downloader functionality.

Heuristics 9

  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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://al-aman.co.uk/wp-admin/BhSk4uiK8vn.php
    • https://sksrfund.gov.sd/south-kordufan/css/plugins/summernote/font/O6FAujckkd.php
    • https://demo.livelubelife.com/a_assets/vendor/calendar/css/core/YxyqUiCthVmX.php
    • https://pisoshidraulicos.com.br/wp-content/plugins/skt-templates/vendor/composer/7ErpT28oeiW.php
    • https://motatrader.co.uk/1eL28qI3i2.php
    • https://alexahomedeco.ro/plugins/vmpayment/klarna/language/en-GB/9wq25vJM.php
    • https://laquanglobal.com/controllers/classes/q40vrEKSrgvaTd.php
    • https://courierms.mymraxx.com/plugins/chartist/dist/scss/settings/Q5WakIrDw05.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
63a3c1679e99415e74f15c93f1c6a10175b5b367dea8a15c1e320bf72e3e3a38		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 12570 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
83636b18441d829399cd56b8245610fc837ce498fbc5744371661487df1443ab		 vba-project OOXML VBA project: xl/vbaProject.bin 78336 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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