Office (OLE) / .XLSX malware analysis — malicious · 38d27f061c03ea7f

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 4503cbbfc4628048e25a4aa10a422e35 SHA-1: e541a63c9d8a01c50d4c9c94dcd419b63f32a3a2 SHA-256: 38d27f061c03ea7f4775b9f1cca703be21bc6fa606a76504f10c69b6547f0913

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.001 PowerShell T1204.002 Malicious File

The sample contains Excel 4.0 macros, specifically an Auto_Open function that utilizes dangerous APIs like RUN and ShellExecute. The embedded URL suggests a download or redirection to a malicious payload. The presence of ShellExecute API calls strongly indicates an attempt to execute external code, likely downloaded 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://anhii.com/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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