Office (OOXML) / .XLSX malware analysis — malicious · c0fb3410e2ddca4f

MALICIOUS

Office (OOXML) / .XLSX

196.6 KB Created: 2021-04-21 13:01:18 UTC Authoring application: Microsoft Excel 15.0300

MD5: bad9949e5f34dea3453014179e9f4705 SHA-1: 4593a7d5c39f17b357923a8ca450353e4267d305 SHA-256: c0fb3410e2ddca4fff784a5aa09f4bc22d46db70a23f934ed69c42c8b98c9d36

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample contains a Workbook_Open macro, indicating that malicious code executes automatically upon opening the spreadsheet. The macro utilizes CreateObject to likely download and execute a second-stage payload from one of the provided URLs. The presence of Environ() calls suggests potential attempts to gather system information or modify the execution environment.

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://4startups.co.za/wp-content/themes/twentytwentyone/template-parts/content/2RqyuNia.php
- https://hanoichinesechurch.com/wp-content/plugins/wordpress-seo/vendor/composer/GHJG9xAh.php
- https://trijayatower.com/wp-content/plugins/creame-whatsapp-me/public/css/3hOcD4Ykt.php
- https://zile75yilasm.com/tmp/install_4dbf17ff8c4a3/mod_vvisit_counter/images/digit_counter/RsJQrl381qAv.php
- https://easitrac.co.za/images/tpDv5fQfXEc9.php
- https://bestel.hallomaasland.be/css/icons/weather-icons/sass/icon-classes/3HpGEmSu0.php
- https://prodigitalize.com/RTg3Z9Jy.php
- https://guidewire.motifdemos.com/node_modules/three/src/animation/tracks/2aE3jvHY.php
- https://www.volsr.org/wp-content/plugins/w3-total-cache/inc/email/rVC4EhMUt.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `0cfe4d4fc942c840a47dbd40660f3add456eb6032b296f5011e0459fb54da3e3`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	9400 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` `d9c95a739a66c9a687dfaf9fb924131d8074bc3908b64737f770c2c3ceb0cf60`	vba-project	OOXML VBA project: xl/vbaProject.bin	51200 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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