Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 a48a4e7080eed719…

MALICIOUS

Office (OOXML) / .XLSX

2.70 MB Created: 2021-05-07 10:35:45 UTC Authoring application: Microsoft Excel 15.0300
MD5: b6a9d0a09c150895fed11f6045d5d79e SHA-1: 8b01b8f27d9f4250a2db817b8dba81af9515e30a SHA-256: a48a4e7080eed7199caf304615301a6a4109a50b7885b9d1c4fd9b7e50f77755
308 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1059.005 Visual Basic

The file contains a Workbook_Open macro that utilizes CreateObject to execute commands via rundll32.exe, indicative of a downloader. The ClamAV detection and heuristic firings strongly suggest this is an Emotet variant. The embedded URLs are likely used to fetch and execute a second-stage payload.

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://rccgpromisedland.org/admin-assets/fonts/fontawesome/svgs/brands/e4E1oOjZXWEj.php
    • https://adventphilomels.org/wp-includes/sodium_compat/src/Core32/ChaCha20/ecbCQtOlK8wLZzY.php
    • https://kpleads.com/kpleads.ali/wp/wp-includes/js/codemirror/FA0MND35N.php
    • https://hereweads.com/wp-content/plugins/woodmart-core/woodmart-core/importer/UZIk36xnY.php
    • https://www.imvula.org/wp-content/plugins/duplicator/installer/build/grxZuQhswdAh.php
    • https://sitonyourassandmakemoney.com/wp-content/plugins/cartflows/theme-support/astra/sOR3qwEjQh3.php
    • https://damonica.com/webedit_includes/de/skins/default/m7OPEeyiZzqD.php
    • https://kineas.be/wp-content/plugins/wordpress-seo/inc/exceptions/7cAm96kjg5T9i.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
2be7671be415a07e3ad37901373ea31d4120e10571a398353c215e06d47b4208		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1998460 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
002d4bccfdb4e46dfc798e05e219f850486dc03eb97b70319118b4e719a91ed1		 vba-project OOXML VBA project: xl/vbaProject.bin 4069888 bytes
Detection
ClamAV: Doc.Downloader.Emotet-10019767-0
Obfuscation or payload: unlikely

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