Office (OLE) / .XLSX malware analysis — malicious · c633e904f8f40fdf

MALICIOUS

Office (OLE) / .XLSX

329.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel

MD5: 7d2750de610a9faa356a68b049c2b93a SHA-1: 07fb5c31303e4f3ba0c0664f90f76f23cb18945e SHA-256: c633e904f8f40fdf2f75a3e48c5cfcc7a651f4e77531edd7e160f79cbded4618

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1204.002 Malicious File: Malicious File

The presence of Excel 4.0 macros, specifically triggering the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics, indicates malicious intent. The SC_STR_SHELLEXEC firing confirms the use of ShellExecute, and the embedded URL suggests a download mechanism. The ClamAV detection further supports the malicious classification. The macro likely downloads and executes a second-stage payload from the provided URL.

Heuristics 5

ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
XLM Auto_Open with dangerous formula APIs high OLE_XLM_DANGEROUS_FN

Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
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://gaspee.info/ds/161120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `b74fbb14c9dd0283fe5b35630158622cf58bbddcd03d161d30bf64d1f40271a4`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	7889 bytes

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