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

Static analysis result for SHA-256 048906257a2dc084…

MALICIOUS

Office (OOXML) / .XLSX

259.4 KB Created: 2021-04-14 15:44:33 UTC Authoring application: Microsoft Excel 15.0300
MD5: f1b5707a91dc56ec33709735482fec45 SHA-1: 1a6127494fddd809150ba7e1654425e57f256a54 SHA-256: 048906257a2dc084ff3d05c657c5cdec454a4c0d1cf43b4db22dd0a16ade4c6a
270 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is an Excel document containing an obfuscated VBA macro that executes upon opening. This macro is designed to download and execute a second-stage payload from one of the listed URLs, as indicated by the critical OLE_VBA_HTTP_DROP_EXEC heuristic. The obfuscated nature and auto-execution mechanism suggest a malicious intent to compromise the user's system.

Heuristics 8

  • 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.
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • 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.
  • 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://1-world-travel.com/wp-content/plugins/wp_multistore_builder_agency/thumbs/button/xNc4J3iqgpM.php
    • https://impactwallpapers.com/extensions/default_pp_pro/storefront/view/default/5DfDPJhutGFBD0p.php
    • https://matchlesstravels.com.pk/backup-12-2-2019/wp-admin/css/colors/blue/lT5C3R1Gcq.php
    • https://draniruddhaghosh.co.in/5sB1De5W5iC96y2.php
    • https://biz.kammel.online/wp-content/themes/twentynineteen/sass/blocks/vQGjdKvDOieW.php
    • https://erlima.com/userfiles/_thumbs/Images/_vti_cnf/3dlbKnTC.php
    • https://shrishinfra.com/uc/css/zd1uT5UZFn1.php
    • https://quaprosa.com/CNcmUBc40tCbU.php
    • https://fudfest.com/1767/11byp4et0YZIbTY.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7fc77366d2c1fa6e2da89c614b897ec30758c13412f4d7f3f412a7d720662d41		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 66702 bytes
vbaProject_00.bin
1e2651a00a9fc676e3bf97fc7863953fd199baf8e0fce6f5974cfd8f1a4459c7		 vba-project OOXML VBA project: xl/vbaProject.bin 200192 bytes

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