Office (OLE) / .XLSX malware analysis — malicious · f5636e4f1fdfdeb1

MALICIOUS

Office (OLE) / .XLSX

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

MD5: e1b1c9478787fce5fb28d813960fe000 SHA-1: 07cf68910ef0dea7f0dfc519de8c5a509d576543 SHA-256: f5636e4f1fdfdeb1b54b84807a01f931ad0e16fba0db48a3d08e97c3ffa45937

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. These macros utilize the ShellExecute API, a common technique for launching malicious payloads. The embedded URL suggests a download or redirection to a secondary stage. The ClamAV detection further supports the malicious classification.

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://camexsuriname.sr/ds/151120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `4d5531650e0faf8764ddd7b14e6947143c32308cbf699d36f8845764b3b4560a`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	5603 bytes

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