Emotet — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 9a7247ef703b1f08…

MALICIOUS

Office (OOXML) / .XLSM

3.55 MB Created: 2021-05-10 15:57:09 UTC Authoring application: Microsoft Excel 15.0300
MD5: 88a1d98c0bbb8eac1d9a6469d9037396 SHA-1: 3524ef222d190faad5999cf8127496d85cf5fe9c SHA-256: 9a7247ef703b1f088c19aa258405ef04ea07521351becb42820bc7e1d48ce0d8
308 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an XLSM file containing a Workbook_Open macro that utilizes CreateObject to execute commands via rundll32.exe. This behavior, combined with the ClamAV detection signature 'Doc.Downloader.Emotet-10019767-0', strongly indicates the Emotet family. The macro is designed to download and execute a second-stage payload from one of the provided URLs.

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://meskot.org/wp-content/plugins/litespeed-cache/src/cdn/0Rek020ky.php
    • https://pointmultimedia.ro/wp-content/plugins/vc-extensions-bundle/borderhover/css/XALocVvcrU.php
    • https://sensor-tek.com/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/bBNTmfXZbIc.php
    • https://consultoriaemimpermeabilizacao.com/wp-includes/js/tinymce/plugins/charmap/SUn668N8oHZI.php
    • https://neatleedone.com/wp-content/plugins/bulk-attachment-download/jabd-downloads/1/ODsVQnOlgHO.php
    • https://araitrade.com/dbi1vnDj.php
    • https://test399.estore.vlinkhosting.com/keO6l8CTVAVBY.php
    • https://toptaxi24.com/toptest/toptaxi/homedir/mail/cur/JqV4fB12DW8cw.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
f3fc138ebee974bd7f3a2918761c716bfc048c4621a0cf98bb3ea29b3c2b419b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2635402 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
923346463fbf910ef455c497347ad0d8a5a4b79a70bf6d2729a7ba680e0aea04		 vba-project OOXML VBA project: xl/vbaProject.bin 5378560 bytes
Detection
ClamAV: Doc.Downloader.Emotet-10019767-0
Obfuscation or payload: unlikely

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