Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 85db6ff84c3d0fb6…

MALICIOUS

Office (OOXML) / .XLSX

2.68 MB Created: 2021-05-07 10:41:07 UTC Authoring application: Microsoft Excel 15.0300
MD5: 9e7d034cfd12442b6f7c3dbf5bbe0709 SHA-1: 9cb52001901d9d9fec776f1acc62257879a52900 SHA-256: 85db6ff84c3d0fb612adfa4c77c15cdb70e0a81eba7cc680ebd6f939f7ef6067
308 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is identified as malicious by ClamAV with a signature indicating it is a downloader, likely Emotet. The presence of a Workbook_Open macro and CreateObject calls, along with a high-confidence heuristic for visible LOLBin command execution, strongly suggests the macro is designed to download and execute a second-stage payload. The embedded URLs are the primary indicators for this download activity.

Heuristics 9

  • 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
  • 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://multigranos.com.bo/wp-content/plugins/woocommerce/i18n/languages/xRrL7GcQN0.php
    • https://lifezhonour.com/backup-11-06-2020/vendor/phpmailer/phpmailer/language/kuVnna5b5FX3Hps.php
    • https://picstructions.com/wp-content/plugins/newsletter/main/js/57op7U4RGH.php
    • https://momentsjo.com/COPYRIGHT/fUK6TkrF5j2dFc.php
    • https://radiouranio.com/player_radio/jquery.lightbox/js/lightbox/themes/zagDA4cqUZOj.php
    • https://smarttechbv.com.br/wp-content/plugins/wp-fastest-cache/css/fonts/5kbCoM4jSnAI.php
    • https://rccgpromisedland.org/admin-assets/fonts/fontawesome/svgs/brands/e4E1oOjZXWEj.php
    • https://loveworldprograms.org/videos/fontawesome/css/FHK2joBPEd.php
    • https://meaamarelmorshedy.com/cpx_admin/plugins/ckeditor/skins/moono/dla4Okf7bQ3.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
49d3d6c5b5f9f8d142e92d75116f91dbfa15fbd5667f800b2b725f21c033c32f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1982134 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
d922e8d54d8e18688f49ee0278f7f4601a2f33d89908be34e14cd708df8fe46f		 vba-project OOXML VBA project: xl/vbaProject.bin 4008448 bytes
Detection
ClamAV: Doc.Downloader.Emotet-10019767-0
Obfuscation or payload: unlikely

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