Emotet — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 9cab036b2947d46e…

MALICIOUS

Office (OOXML) / .XLSM

3.63 MB Created: 2021-05-10 15:58:51 UTC Authoring application: Microsoft Excel 15.0300
MD5: 5be679689ef0b790f96d52f8d08f0c19 SHA-1: d896efae48def6656d52f78149cdec051afb7517 SHA-256: 9cab036b2947d46e08706314ac7f4c48908aba38a794568174758d5b55027799
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 sample is an XLSM file containing a Workbook_Open macro that utilizes CreateObject to execute commands via rundll32.exe. This macro is designed to download and execute a second-stage payload from one of the embedded URLs. The ClamAV detection and heuristic firings strongly indicate 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://archampton.com/wp-content/plugins/kirki/controls/css/Ic6AlDEacA.php
    • https://kuwaitiurologist.com/beta/vendor/dnoegel/php-xdg-base-dir/src/VVWhvoXcz.php
    • https://bbw.checkmynewsite.com/wp-content/themes/twentytwentyone/template-parts/content/nEE7SGUw.php
    • https://s3solutions.ae/d6dCRQeJGD00Os.php
    • https://mtzasesores.com/wp-content/themes/invictus/templates/events/aVORUgnnJ.php
    • https://radioguadalupanalavozcatolica.com/player/templates/simple/custom/ljMPklt0Jql.php
    • https://kronocreativeagency.com/wp-content/themes/twentynineteen/template-parts/content/O9chyPRvQDmYt.php
    • https://serdalpecel.com.tr/css/fonts/font-awesome/css/smUU2T8ExE4p.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
11d96c2b0f0ee1460e475e3a139897e8c734eb33af96ca35fa5242e94ef01006		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2698137 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
38aa6a6538ca46f4bd34ce148131de3e98f4d1a859d1062bb67d1850cb3b26c5		 vba-project OOXML VBA project: xl/vbaProject.bin 5506560 bytes
Detection
ClamAV: Doc.Downloader.Emotet-10019767-0
Obfuscation or payload: unlikely

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