Office (OOXML) / .XLSM malware analysis — malicious · d512649f7cdfb729

MALICIOUS

Office (OOXML) / .XLSM

219.8 KB Created: 2021-05-07 12:31:30 UTC Authoring application: Microsoft Excel 15.0300

MD5: d782550b5e27c554e73b6213e6cc3c42 SHA-1: de971621d607008c570dbd14ff46373f2e9b83ae SHA-256: d512649f7cdfb72982877c139a78fd1bb71a8a47ecc1b16605f8573104703fc0

248 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The presence of a Workbook_Open macro, CreateObject calls, and a visible LOLBin command execution instruction strongly indicate malicious intent. The script likely uses MSXML2.XMLHTTP and ADODB.Stream to download and execute a second-stage payload from one of the embedded URLs, as suggested by the 'Xls.Downloader' ClamAV detection. The document body contains strings related to these actions and the URLs themselves.

Heuristics 8

ClamAV: Xls.Downloader.TrendMicroDridex0521-9860965-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.TrendMicroDridex0521-9860965-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND

Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
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://chefalle.com/wp-includes/sodium_compat/namespaced/Core/ChaCha20/4Uf6CSbEGj3.php
- https://jajainfo.net/zm/wp-content/uploads/2013/06/b4KjNHHVq5p.php
- https://trenerwpoznaniu.pl/classes/tinymce/themes/inlite/config/WjCKp9Cb.php
- https://plusify.in/wp-admin/css/colors/blue/LbMOrvuqScsDDYJ.php
- https://wapi.woohooads.com/u1KFrb70e421R.php
- https://samakje.com/wp-content/plugins/siteorigin-panels/compat/js/70K882jFbZgmZF.php
- https://a14.fiveghosting.com/fBSkQClRc.php
- https://impulscentar.rs/wp-content/plugins/litespeed-cache/css/fonts/2KIOjQN9JSF.php
- https://37.fiveghosting.com/YyXdbwCNNeEkw.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `7ba039825344db02833afb6ba61a976fd193220f9ba938b9c041b33bcf745039`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	41191 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` `bd654312a05ba6b428becedc08c55902e327368111f081b7ec622813785f1131`	vba-project	OOXML VBA project: xl/vbaProject.bin	260608 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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