Emotet — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 c608e5b60b93080a…

MALICIOUS

Office (OOXML) / .XLSM

4.27 MB Created: 2021-05-06 15:03:10 UTC Authoring application: Microsoft Excel 15.0300
MD5: 8a52b4efb7c01e551461c32098ddbc5b SHA-1: 2b073079fac4fd8975511ee824bb0854b731e2f0 SHA-256: c608e5b60b93080aa864368423573655eb6f9879e74e702a333009f2818bacb5
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 presence of a Workbook_Open macro, coupled with CreateObject and Environ calls, strongly indicates malicious intent. The macro is designed to execute a command via rundll32.exe, likely to download and run a second-stage payload from one of the provided URLs. ClamAV detections confirm this file is associated with the Emotet family, known for its downloader capabilities.

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/SFMm6Qoe.php
    • https://bhuttangill.com/wp-includes/js/tinymce/themes/inlite/Agk5yxu6D3SEW.php
    • https://tafaghodi.ir/resume/files/EHEtRsJyIPR6o75.php
    • https://touchuphouse.com/wp-content/plugins/wp-file-manager/inc/images/VsMQ4PexH.php
    • https://sidnetworld.com/env/add-ons/tinymce/themes/inlite/HShRYdMy.php
    • https://grupoakrabu.com/img/galeria/paEAehZhSWNmH.php
    • https://italmaps.com/nuovo/wp-includes/js/jquery/ui/vUYhCCeCNKQoEk.php
    • https://darkmattercompany.com/billing/templates/orderforms/comparison/images/OMqNCOuk.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3641875697f313304825fb2f70d0832fc4ffcb7289619b12ff3ddf2b2219d229		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3181446 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
ccb4620732134262ffb02bacb969d7b9dfa16e9ee6cd99b6845c317cbc7f2c44		 vba-project OOXML VBA project: xl/vbaProject.bin 6411776 bytes
Detection
ClamAV: Doc.Downloader.Emotet-10019767-0
Obfuscation or payload: unlikely

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