Office (OLE) / .XLS malware analysis — malicious · 7ad5699ed15830bb

MALICIOUS

Office (OLE) / .XLS

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

MD5: 6f0b9b5884b066e938d32567929d3fba SHA-1: 4d9d1ab14e01d4a1b267e120607a6d4da31893be SHA-256: 7ad5699ed15830bb4e1fb3bf1b03975fe48f6bd609e8a257fa0fa4440cb048de

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) spreadsheet containing an Auto_Open macro, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_AUTOOPEN_DEFINEDNAME heuristics. The SE_ENABLE_LURE heuristic confirms the document prompts the user to enable macros. The extracted DOC BODY and script fragments reveal two URLs, 'https://escolamundoazul.com.br/ntmQmwXnc6KC/ue.html' and 'https://laresumeservice.com/wp7rTKrY/ue.html', which are likely used to download a second-stage payload. The XLM macros are designed to execute automatically upon opening the document after macros are enabled.

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://escolamundoazul.com.br/ntmQmwXnc6KC/ue.html
- https://laresumeservice.com/wp7rTKrY/ue.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `e0f9b32b2cf7d5bbad99732afb6eb8bf95619170305ebee6a87504bc690cca2a`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8209 bytes

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