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

Static analysis result for SHA-256 2db9aba962314d68…

MALICIOUS

Office (OOXML) / .XLSX

170.3 KB Created: 2021-04-21 13:09:16 UTC Authoring application: Microsoft Excel 15.0300
MD5: b0a053930116048ce5ba43eb505513ee SHA-1: 8a22f50fd65575975722cee6169f51e3e497b2e6 SHA-256: 2db9aba962314d68dd87dd2404ce6533cd28e5bbc2098c591fc23b018c3a3982
148 Risk Score

Malware Insights

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

The sample is an Office document containing a Workbook_Open macro, indicating it attempts to execute code upon opening. The VBA code uses CreateObject to instantiate MSXML2.XMLHTTP and ADODB.Stream, suggesting it will download and execute a second-stage payload from one of the provided URLs. The presence of a fake CAPTCHA-like text in the document body further supports the lure mechanism for enabling macros.

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://promocionessostenibles.es/wp-content/plugins/meta-box/css/jqueryui/EAMqn8EBm.php
    • https://farmlandsinvest.com/wp-content/plugins/woocommerce/packages/action-scheduler/nIscJ8h0.php
    • https://jbbackgrounds.com/library-aquarium-backgrounds/jb/full/uYE01HW3oO.php
    • https://guidewire.motifdemos.com/node_modules/three/src/animation/tracks/2aE3jvHY.php
    • https://bestel.hallomaasland.be/css/icons/weather-icons/sass/icon-classes/3HpGEmSu0.php
    • https://oic.gov.pg/wp-content/plugins/smart-slider-3/Nextend/SmartSlider3/Platform/WordPress/Integration/Divi/V31ge/includes/modules/SmartSlider3FullWidth/3TktARjwB2fpVk.php
    • https://grupo-gessa.com/YvSbL3zjYQ.php
    • https://successnoregrets.com/__MACOSX/img/VpfxnXS5mMt7.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
86677de35bb7d386be5107ba7db13c9985039f5d7df40f7ea154df5b42417531		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 9397 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
d164f369c348874d92921dc54af4fa591b0d51c253d594fa24a1ed9911ea8e87		 vba-project OOXML VBA project: xl/vbaProject.bin 48640 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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