Office (OLE) / .XLS malware analysis — malicious · f57fc2b85e1a1468

MALICIOUS

Office (OLE) / .XLS

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

MD5: ba1a977cf3b44cd9383162fbcd2d2f22 SHA-1: 63d7f66332c22d4209d3ffde52995b4ed9d2ad21 SHA-256: f57fc2b85e1a1468acce478b16b2b112f70b6fe8f5e953c788cb62ca0a96062c

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.004 Scripting - Microsoft JScript T1059.001 PowerShell T1059.003 Windows Command Shell

The presence of Excel 4.0 macros, specifically an Auto_Open macro utilizing dangerous functions like RUN, strongly indicates malicious intent. The macro is likely responsible for executing a payload, as suggested by the ShellExecute API reference. The embedded URLs are probable sources for downloading this secondary payload. The ClamAV detection further corroborates the malicious nature of the file.

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://boatssa.com/ds/231120.gif
- https://boatssa.com/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `96eae7b570d4a9d4f225045676982008ec43ffa50f8643e2397db329f3c9bb6b`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6059 bytes

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