Office (OOXML) / .XLSM malware analysis — malicious · 28e6b8ecae6692df

MALICIOUS

Office (OOXML) / .XLSM

304.3 KB Created: 2021-04-12 15:33:32 UTC Authoring application: Microsoft Excel 15.0300

MD5: af4c749508c43b22a65112b5236ed31c SHA-1: e32f704b61c9ff44fc72b84be99f72b9dec94b12 SHA-256: 28e6b8ecae6692df4f9e19f5f4447351c4baf93233676e846a9d8fcc70cc5da6

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The sample is an XLSM file containing VBA macros, with a Workbook_Open macro detected. The script uses CreateObject and Environ() calls, and exhibits string obfuscation. The embedded URLs in the document body are likely used to download and execute a second-stage payload. The combination of macro execution and embedded URLs strongly suggests a malicious intent to compromise the user's system.

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://expoze360.com/wsb/smm/vendor/ramsey/uuid/YZnmmdRaNYeP.php
- https://opticahealthvision.com/wp-includes/js/tinymce/themes/inlite/6oc5yCaQGY0zv.php
- https://razapparelsbd.com/ima/wp-content/uploads/2021/01/Oyo18x4LVQqNgYy.php
- https://ingtedis.com/resources/chAczm9XTT0VY4.php
- https://platinumlabel.net/wp-content/plugins/jetpack/modules/after-the-deadline/ULKnO8sQ4.php
- https://standard.techfreestore.com/KJStyqxJw.php
- https://rockin1000.com.br/code/img/SocialMedia/IThiDYMU.php
- https://wordpress.interactivolive.com/etum/aulavirtual/mod/url/backup/fmlveNkcm0oW.php
- https://lyonfruit.com/images/tEK1sLUx4BK.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `4c029a54e5f0a691445e2affade9cf19d750d1f7a7c9f6556ff9de04b39121bd`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	83877 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 24 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `e5e86285502bb46010be61d467f07a01d2bd707c2dd5c18116637dedc8def161`	vba-project	OOXML VBA project: xl/vbaProject.bin	242176 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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