Office (OLE) / .XLSX malware analysis — malicious · 4b9a385a5953cfe7

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 5fb521b0cd2c588b3e69d9b3b768a0f6 SHA-1: 5f21f522954b0c62ce7f021c53ab9e6d216af0ce SHA-256: 4b9a385a5953cfe798cab5b5f2c9b81dfc28db23d7603a1c0ee689ba2306a133

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file contains an Excel 4.0 macro (OLE_XLM_AUTOOPEN) that utilizes a ShellExecute API call (SC_STR_SHELLEXEC). This macro is designed to execute dangerous functions (OLE_XLM_DANGEROUS_FN), specifically the RUN function, which is often used to download and execute additional malware. The embedded URL is likely the source for this secondary payload. The ClamAV detection further confirms its malicious nature as a downloader.

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 http://new.odingrad.com/ds/151120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `89aad7b8576d8f84c1934acd2fc0826a9bcea7c600ce1ac7e8579bafe1fef843`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	5602 bytes

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