Office (OLE) / .XLS malware analysis — malicious · 5975e6fd3d3a564c

MALICIOUS

Office (OLE) / .XLS

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

MD5: 9a3cea3303a66135b4cc44e4b6fb4374 SHA-1: b7008bdf5b53f6789c8f49b931149f483467c63d SHA-256: 5975e6fd3d3a564c19ea8f0441477c80d4209a47b00b052ae930db3f8259179c

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample is an Excel 4.0 macro-enabled spreadsheet. It contains an Auto_Open macro that is configured to execute dangerous functions, specifically the RUN function. The macro attempts to download a payload from the URL http://evz15lmlir03sygmyr.xyz/w. The document body also contains text that appears to be a lure to enable macros. The combination of these factors indicates a malicious downloader.

Heuristics 4

Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME

oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
XLM Auto_Open with dangerous formula APIs critical 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.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `fd6b6732bb5d8b99adfa87c04ba4c9babdbbf213b0dac0c1e11081e5815ebd85`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	4546 bytes

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