Office (OLE) / .XLSX malware analysis — malicious · af77d58150c9ad5a

MALICIOUS

Office (OLE) / .XLSX

605.0 KB Created: 2021-05-26 12:06:05 Authoring application: Microsoft Excel

MD5: 5dc1e49cf7213349c5b1d96b76c02fd6 SHA-1: 49c458b405d9fb128e37d2b23e661c0b838bca58 SHA-256: af77d58150c9ad5a9b19c138cea5d6fb7055fd4355acbbf2a5d41f41ae75bd08

230 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample is a malicious Excel file containing VBA macros, specifically a Workbook_Open macro that uses CreateObject to execute code. This macro is designed to download and execute a second-stage payload from one of the embedded URLs. The presence of an appended executable payload further supports this malicious intent. No document body text was available for analysis, so the rationale is based on the script's behavior and heuristic firings.

Heuristics 8

OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD

OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
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 — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
URL https://houzzlink.com/wp-content/G:Zldplugins/osG:Zlden-wc-m�
- https://kweraltd.com/wp-content/PK1Avplugins/woocPK1Avommerce-delivery-notes/PK1Avincludes/cPK1Avomponent/u63R8PK1Av4hM.php
- https://aspiloselaia.ceD#*Ffserver3.net/wp-coeD#*Fntent/plugins/polyCU
- https://bycec.in2a&@4/wp-includes/js/tinymce��\\
- https://adeylVYasWgtylVYasW.com/wp-ylVYasWincludes/sodium_compat/nam�
- https://houzzlink.com/wp-content/G:Zldplugins/osG:Zlden-wc-mpesa-master/updates/Puc/KOmZGbynRtPJ.php
- https://aspiloselaia.ceD#*Ffserver3.net/wp-coeD#*Fntent/plugins/polylang/js/build/ek117gBgoNad.php
- https://organigrama.gualda.co@\|a4qm/wp-content/plugins/codep@\|a4qress-admin-columns/classes/Admin/Wl8gnvHwQ7z.php
- https://bycec.in2a&@4/wp-includes/js/tinymce/plugins/charmap/1MRWRA2a&@48z2S2Ajv.php
- https://www8-QS+0p.matteico.com/NMI_beta/wp8-QS+0p-cont8-QS+0pent/plugins/wp-smushit/_src/BNtsMfSe12.php
- https://opcabd.orQk)kl.wg/wp-content/themes/twentyseventeen/template-parts/footer/8BUPblS5CRGm.php
- https://adeylVYasWgtylVYasW.com/wp-ylVYasWincludes/sodium_compat/namespaced/Core/ChylVYasWaylVYasWCha20/eDKgoiZov82FT.php

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `3e889b40f05f5a575e714e8585b4de8797b0ea4e0b360720cb24af2fee420ee6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	128091 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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