Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 7831e7e88558217f…

MALICIOUS

Office (OOXML) / .XLSX

2.84 MB Created: 2021-05-06 15:09:04 UTC Authoring application: Microsoft Excel 15.0300
MD5: 12218d47ca7cc4201ff1d17b214e5daa SHA-1: e362987c2493d21d4834f79c48f60591f45a808c SHA-256: 7831e7e88558217f0704fa656fd6ce568c3529159099c31426adee195295c17a
370 Risk Score

Malware Insights

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

The sample is an Excel document containing a Workbook_Open macro that utilizes `CreateObject` to download a file from a remote URL and execute it. The macro's logic strongly suggests it's designed to fetch and run a second-stage payload, consistent with downloader malware. The ClamAV detection of 'Doc.Downloader.Emotet-10019767-0' further supports this assessment.

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://wickerconsultingllc.com/wp-content/plugins/force-regenerate-thumbnails/jquery-ui/redmond/MGggfHzY0QH0Cp3.php
    • https://touchuphouse.com/wp-content/plugins/wp-file-manager/inc/images/VsMQ4PexH.php
    • https://sidnetworld.com/env/add-ons/tinymce/themes/inlite/HShRYdMy.php
    • https://www.emprepyme.com.ar/wp/wp-includes/SimplePie/Decode/HTML/uSryOO1m8EGzN.php
    • https://skyblix.ml/wp-content/plugins/astra-widgets/classes/widgets/7c1Qn1myq.php
    • https://bubbadms.com/user_guide/_static/css/ZkIMh91mDLu9z7.php
    • https://bhuttangill.com/wp-includes/js/tinymce/themes/inlite/Agk5yxu6D3SEW.php
    • https://lifezhonour.com/backup-11-06-2020/vendor/phpmailer/phpmailer/language/ZSLrSr5Nwx.php
    • https://grupoakrabu.com/img/galeria/paEAehZhSWNmH.php
    • https://gruposiel.com/image/cache/catalog/demo/banners/impvRKas7.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9f08b198457aace24f71911a2fede11bb511cb79c1abfcafdcf4a48bbd174523		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1980954 bytes
vbaProject_00.bin
556fa0975d0eed6080a0818942f5c72ec593cc0fa54fefc6c46ffa0742431ba1		 vba-project OOXML VBA project: xl/vbaProject.bin 4024832 bytes
Detection
ClamAV: Doc.Downloader.Emotet-10019767-0
Obfuscation or payload: unlikely

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