Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 3f5ca9c142356aa9…

MALICIOUS

Office (OOXML) / .XLSX

2.90 MB Created: 2021-05-07 10:37:38 UTC Authoring application: Microsoft Excel 15.0300
MD5: 5ef13eda3820a3d1a1ce94e1b4df14ae SHA-1: 01f4b90876cc7f417bd8f0776c7b1dc4f066ad14 SHA-256: 3f5ca9c142356aa91391514a2655ca41fb45f715ebda007731cc08a4b1368243
348 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1218.011 Rundll32 T1059.003 Windows Command Shell T1140 Deobfuscate/Decode Files or Information T1059.005 Visual Basic

The sample contains a Workbook_Open macro that utilizes CreateObject to execute commands via Wscript.Shell, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' and 'SE_LOLBIN_RUN_COMMAND' heuristics. The embedded document body text contains strings related to HTTP requests and execution tools like rundll32.exe, suggesting the macro downloads and executes a second-stage payload from one of the provided URLs. The ClamAV detection of 'Doc.Downloader.Emotet-10019767-0' strongly supports the Emotet family attribution.

Heuristics 10

  • ClamAV: Doc.Downloader.Emotet-10019767-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-10019767-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://rccgpromisedland.org/admin-assets/fonts/fontawesome/svgs/brands/e4E1oOjZXWEj.php
    • https://momentsjo.com/COPYRIGHT/fUK6TkrF5j2dFc.php
    • https://fantasymedia.net/deviantden.com/wp-content/themes/twentynineteen/classes/qxEJ4XFyEF.php
    • https://wypozyczalnia-dragon.pl/libraries/fof/integration/joomla/filesystem/v566mU4QOL0.php
    • https://ultradiademexico.com/templates/ja_purity/styles/header/blue/nDNeZQP5.php
    • https://arfresa.com/globospayasoperu.com/web/wp-content/et-cache/178/088bWm9bjVQJe.php
    • https://raufsana.com/ls-panel/ckeditor/plugins/magicline/images/wU1DtAWj6.php
    • https://zetortcommunications.co.ke/wp-content/plugins/woocommerce/includes/abstracts/t8wJEqJD.php
    • https://loveworldprograms.org/videos/fontawesome/css/FHK2joBPEd.php
    • https://smarttechbv.com.br/wp-content/plugins/wp-fastest-cache/css/fonts/5kbCoM4jSnAI.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
23411467b84dac49f4cf8fdb5e3699f6e2c28fc5d2471d397a81bfbe58743237		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2018179 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
4679d997ec284bb15306f94587940377e3088571f40c1cc440eac54b1dcb64bf		 vba-project OOXML VBA project: xl/vbaProject.bin 4088320 bytes
Detection
ClamAV: Doc.Downloader.Emotet-10019767-0
Obfuscation or payload: unlikely

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