Office (OOXML) / .XLSM malware analysis — malicious · 3bd55c9e2fdcd1b7

MALICIOUS

Office (OOXML) / .XLSM

161.8 KB Created: 2021-04-21 14:20:23 UTC Authoring application: Microsoft Excel 15.0300

MD5: c02eba6c5cb189c3dfd85199b785077b SHA-1: 7b1c517e64a46840a9da597496325a30ab7f42a1 SHA-256: 3bd55c9e2fdcd1b707612af00bcc75f5e11640d9d9952ddf3a68d107f27f9102

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The sample is an XLSM file containing a Workbook_Open macro, indicating it's designed to execute malicious code upon opening. The VBA code uses CreateObject to likely download and execute a second-stage payload from one of the numerous suspicious URLs found in the document body. The presence of a Workbook_Open macro and CreateObject calls strongly suggests a downloader or droppper functionality.

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://anthonychan.co/lp/wp-includes/js/jquery/ui/c8GhzMSm.php
- https://mihlodzi.co.za/wastemp/font-awesome/css/ikaXQ4HcVYlFg.php
- https://canadianteenagers.net/old-bkp/themes/dolphin/images/icons/ICETKuHKxf.php
- https://mueblesromero.net/vmfiles/hHXXLCcJv0JgsF.php
- https://petcollarsunlimited.com/zfsDkJzvCTj0.php
- https://mundodelas.sistemasvip.com.br/new/full/imagens/R0UtGyWd.php
- https://rms.adeelchaudry.pk/util/XvwYAL5dS0EPsi.php
- https://cbaebooks.unitedinstitute.org.in/login-files/fonts/Linearicons-Free-v1.0.0/WebFont/aPymRuMPtg.php
- https://vanesadonisi.com/wp-content/themes/brando/templates/archive-header/rUlGhpz7vj8KWBg.php
- https://tsgetout.com/img/lQHJAMqvAi.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `b1cbe7b9160d9e2a04472cde69d948d7996bfadbd305ae525d9ae914959710b4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	8785 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` `4aea112a96077d436279949feffe7f85a9da13a52b4717f286511234a1dc0a64`	vba-project	OOXML VBA project: xl/vbaProject.bin	60416 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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