Office (OLE) / .XLSX malware analysis — malicious · 4c45872daedcd6e6

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 59d337aada76b3fcd5b93d43995d0229 SHA-1: a98446265c5b40e41e2e742364652cfd72625eba SHA-256: 4c45872daedcd6e667e1140700fc55adba4ffb7ccd8efb84628cdfda6f892750

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 suggests a malicious intent to download and execute a payload. The embedded URL points to a GIF file, which is likely a lure or a redirector for the actual malicious content. 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://gaspee.info/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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