Office (OLE) / .XLSX malware analysis — malicious · 43c0583d65317f76

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 697961768d846577fc4610a633d914bf SHA-1: 4b5cd473e227061ae05480081fb1a6424f70807f SHA-256: 43c0583d65317f766b8f626db01cc5cbaa6fe87bbbc4d40d50d676a5dd6987cd

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The presence of Excel 4.0 macros, specifically an Auto_Open macro utilizing dangerous functions like RUN and ShellExecute, strongly indicates a malicious downloader. The embedded URL suggests the macro's intent is to fetch and execute a secondary payload. The ClamAV detection further supports this assessment.

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://qxcb.net/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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