Emotet — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 5cc765f17d362f32…

MALICIOUS

Office (OOXML) / .XLSM

3.54 MB Created: 2021-05-10 15:55:51 UTC Authoring application: Microsoft Excel 15.0300
MD5: 5cac53a51f7533ac8eda9357c108b929 SHA-1: 0d0381054de677047ee127e8533039a22e4e11eb SHA-256: 5cc765f17d362f3295d020c61dfd394ac980ea0ab81ae95bba64f528a84ce13a
370 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is an XLSM file containing a Workbook_Open macro that utilizes `CreateObject` and `Wscript.Shell` to download and execute a second-stage payload from a remote URL. The ClamAV detection and heuristic firings strongly indicate this is an Emotet downloader. The macro's primary function is to fetch and run a malicious executable from one of the provided URLs.

Heuristics 10

  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • 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
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — 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://sincroniasdelalma-new.srcomputadoras.com/wp-content/themes/twentynineteen/template-parts/content/S1tU7zL7RBAfK.php
    • https://tseboprocurement.co.za/inc/phpmailer/test_script/images/_notes/E3KYpyHWeU.php
    • https://lernendeutsch.de/App/vendor/phar-io/manifest/examples/rC6SrlTXo3VNK9.php
    • https://neatleedone.com/wp-content/plugins/bulk-attachment-download/jabd-downloads/1/ODsVQnOlgHO.php
    • https://mtzasesores.com/wp-content/themes/invictus/templates/events/aVORUgnnJ.php
    • https://consultoriaemimpermeabilizacao.com/wp-includes/js/tinymce/plugins/charmap/SUn668N8oHZI.php
    • https://archampton.com/wp-content/plugins/kirki/controls/css/Ic6AlDEacA.php
    • https://beta.hairshow.pt/Xkjfx6qv.php
    • https://vorsocmart.com/jVdoyxAE.php
    • https://greenbelt-mea.com/css/IYQWLc9dokeSK0.php
    • https://sincroniasdela

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d18b3ef68f547a62534f6140d886c0127ebcf9c4435be8ec7d339847b7073dfd		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2630723 bytes
vbaProject_00.bin
7283b8dba9ff4bb1ba2654148f08f6f3f5561996ae5e5554f432804ef1102bb1		 vba-project OOXML VBA project: xl/vbaProject.bin 5405184 bytes
Detection
ClamAV: Doc.Downloader.Emotet-10019767-0
Obfuscation or payload: unlikely

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