Office (OLE) / .XLSX malware analysis — malicious · b4d82f493fa5064f

MALICIOUS

Office (OLE) / .XLSX

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

MD5: eec4f31b4cb1d02f86d839680e8d1d84 SHA-1: 6c41bd26afa01e64285f440994ff9bba831f809e SHA-256: b4d82f493fa5064f8ad5be823804bb9cc05486dacd4fa9dbf3f003537b7aa9cc

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file contains Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The SC_STR_SHELLEXEC firing suggests the macro uses ShellExecute, a common technique for downloading and executing further stages. The embedded URL points to a suspicious domain, likely hosting the secondary payload. The ClamAV detection further confirms its malicious nature.

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://nomzoo.ml/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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