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

Static analysis result for SHA-256 d56353051b3256c7…

MALICIOUS

Office (OOXML) / .XLSX

180.5 KB Created: 2021-04-21 13:41:20 UTC Authoring application: Microsoft Excel 15.0300
MD5: 49055909211c6794fc44c85e3e8b8619 SHA-1: b2f5c0d57600ca127b0ea203a47ea49de366665e SHA-256: d56353051b3256c74c2e0df4d907f955ded8482f8cb8610f69916f80bc49eb67
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The sample is an XLSX file containing a Workbook_Open VBA macro, which is a common technique for executing malicious code upon opening the document. The macro uses CreateObject to likely download and execute a second-stage payload from one of the provided URLs. The presence of the Workbook_Open macro and the CreateObject call strongly indicate malicious intent.

Heuristics 6

  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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://ar.montenegroinvesting.com/wp-content/plugins/contact-form-7/modules/recaptcha/PMGHOKjn8HZhWUk.php
    • https://itessoftware.com/hotel-app/new/images/mens/one/EASMjuSn9IagGnq.php
    • https://oic.gov.pg/wp-content/plugins/smart-slider-3/Nextend/SmartSlider3/Platform/WordPress/Integration/Divi/V31ge/includes/modules/SmartSlider3FullWidth/3TktARjwB2fpVk.php
    • https://www.volsr.org/wp-content/plugins/w3-total-cache/inc/email/rVC4EhMUt.php
    • https://sweetpapas.com/wp-content/plugins/really-simple-ssl/testssl/cloudflare/XGeXzH8b.php
    • https://jbbackgrounds.com/library-aquarium-backgrounds/jb/full/uYE01HW3oO.php
    • https://easitrac.co.za/images/tpDv5fQfXEc9.php
    • https://promocionessostenibles.es/wp-content/plugins/meta-box/css/jqueryui/EAMqn8EBm.php
    • https://bestel.hallomaasland.be/css/icons/weather-icons/sass/icon-classes/3HpGEmSu0.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b71e598a44be8d76218aabbe89e9fc4817a90004a482e21f62078b2c0d736f98		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 8955 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
03e8f2dc41e6629d2b4136bf56af06ea03e783f7262e098d5be5fd1999158429		 vba-project OOXML VBA project: xl/vbaProject.bin 49664 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

Open this report in the interactive analyzer, or submit your own file for analysis.