Office (OLE) / .XLS malware analysis — malicious · 51a1c442af173fc3

MALICIOUS

Office (OLE) / .XLS

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

MD5: df5c3e2bec0e3ba8ad82064747ede7aa SHA-1: e461733d246c967057602e66d0f9a3761226d63d SHA-256: 51a1c442af173fc346352dcdd979914578c8f958cec46ce768c7eec76ee6fdfb

102 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel 4.0 (XLM) macro sheet that contains an Auto_Open entry, indicating it will execute automatically when the workbook is opened. The document body and heuristics indicate a lure to enable macros. The extracted URLs are likely used to download and execute a second-stage payload. The XLM macro sheet is too truncated to determine the exact execution flow, but the presence of Auto_Open and embedded URLs strongly suggests a downloader or droppper functionality.

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.
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
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://stateoftheartacademy.com.br/E4V8njAb2/ue.html
- https://dsafarm.com/h03itpGP/ue.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `e808156aa76369abc653ef5da0e4637a11444d74c8ce4e627b8f3942d60b3178`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8209 bytes

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