Emotet — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 dcfdc1ef039f2a34…

MALICIOUS

Office (OOXML) / .XLSM

3.59 MB Created: 2021-05-10 15:55:32 UTC Authoring application: Microsoft Excel 15.0300
MD5: 9eb4d0e220f134e012b50d7271d4fcc2 SHA-1: 72feb295a6617faae088531bff2ebdd686504253 SHA-256: dcfdc1ef039f2a3471a7e8e869815d1792f44417ddeb5f058a0d12e1f7581bd8
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, CreateObject calls, and visible LOLBin execution instructions strongly indicates malicious intent. The ClamAV detection as 'Doc.Downloader.Emotet-10019767-0' confirms this. The embedded URLs are likely used to download and execute a second-stage payload, a common Emotet delivery technique.

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://archampton.com/wp-content/plugins/kirki/controls/css/Ic6AlDEacA.php
    • https://yolophiwe.co.za/progress/lib/lightbox/css/HIYRmK7Zz5StRsU.php
    • https://nellyfunerals.co.za/VKzdkfe8ufv.php
    • https://pointmultimedia.ro/wp-content/plugins/vc-extensions-bundle/borderhover/css/XALocVvcrU.php
    • https://toptaxi24.com/toptest/toptaxi/homedir/mail/cur/JqV4fB12DW8cw.php
    • https://vorsocmart.com/jVdoyxAE.php
    • https://mutlumedya.com/wp-content/plugins/js_composer/include/autoload/roR2rMO2Gr3K3.php
    • https://sensor-tek.com/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/bBNTmfXZbIc.php
    • https://navigator.fun/wp-content/plugins/refer-a-friend-for-woocommerce-by-wpgens/public/js/mCB8abRB2.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
6ee3fc15807fb1995546b613b5427d3437ddb604fc86b59fff9039c652495758		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2643521 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
3b9f2f1dd74f645e622b4b04bd399c5e08120ad2c117363638cd3d68d64ac07b		 vba-project OOXML VBA project: xl/vbaProject.bin 5394944 bytes
Detection
ClamAV: Doc.Downloader.Emotet-10019767-0
Obfuscation or payload: unlikely

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