Emotet — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 922c572fbe178368…

MALICIOUS

Office (OOXML) / .XLSM

2.63 MB Created: 2021-05-07 10:54:14 UTC Authoring application: Microsoft Excel 15.0300
MD5: fc64e1ac6687fde65b4a71636c333c62 SHA-1: b8eeab0cb8c918aa01bdd988f18d15bf6f46c8c7 SHA-256: 922c572fbe178368893ab134f00ce3817dc2518eff57e2f5ef685ffab2fa13f0
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 the use of rundll32.exe strongly indicate malicious intent. The ClamAV detection as 'Doc.Downloader.Emotet-10019767-0' further supports this. The script likely downloads and executes a second-stage payload from one of the embedded URLs, consistent with Emotet's typical behavior.

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://certifica.app.infoweb.boatcover.org/dt_091901820028/condivise/immagini/icone/icone-default-on/2NJsNm1KQuTMMVo.php
    • https://plusify.in/wp-admin/css/colors/blue/LbMOrvuqScsDDYJ.php
    • https://co-deporte.com/wp-content/plugins/revslider/includes/InstagramScraper/DR34CZJP1juKE.php
    • https://super-menu.it/includes/lib/HTMLPurifier/standalone/HTMLPurifier/wNYWKg4fYdO.php
    • https://shoreline.revivedevelopment.com/include/class/adodb/adodbSQL_drivers/msql/LkyCKhnFyR.php
    • https://lindcredit.com/bundles/easyadmin/images/flags/RgVQBNfOa8HZ1ew.php
    • https://natalierosenberg.com/wp-content/plugins/jetpack/images/apps/4dyIrpZd9bMQ.php
    • https://samakje.com/wp-content/plugins/siteorigin-panels/compat/js/70K882jFbZgmZF.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
41633b4738ea462785dfd1927b45676e18a7bcab0003e7c62f72263b9febd82c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1944257 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
7a7bc71fbd55e4e4e53a1029b3422c4c84e829079ffe70e6f33ab772d9f1fe16		 vba-project OOXML VBA project: xl/vbaProject.bin 3935232 bytes
Detection
ClamAV: Doc.Downloader.Emotet-10019767-0
Obfuscation or payload: unlikely

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