Office (OLE) / .XLS malware analysis — malicious · d8c7b56a3a8e51b8

MALICIOUS

Office (OLE) / .XLS

525.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2021-05-29

MD5: a7de38263c914a68f3c31ce0733f7d1f SHA-1: c47850c16565bdd0634161aba5404444f25915fb SHA-256: d8c7b56a3a8e51b895e8cd95ce5b7c331b6743bc866ddf48e34c007ec6b700d9

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 User Execution T1204.002 Malicious File

The presence of an XLM macro sheet and a heuristic indicating a lure to enable macros strongly suggests this document is designed to execute malicious code. The embedded URLs are likely used to download secondary payloads. No specific script content was extracted, limiting deeper analysis of the execution flow.

Heuristics 5

XLM Auto_Open workbook with payload URL or enable-content lure critical OLE_XLM_AUTOOPEN_PAYLOAD_LURE

Workbook contains an Excel 4.0 macro sheet with Auto_Open / Auto_Close and also exposes a payload URL or enable-content lure in the OLE bytes. This combination is a high-confidence XLM downloader/social-engineering pattern even when formula recovery cannot decode the full macro chain.
Excel 4.0 (XLM) macro sheet uses dangerous capability functions high OLE_XLM_DANGEROUS_FN_STATIC

Workbook contains an Excel 4.0 macro sheet whose formulas reference two or more dangerous capability functions (e.g. CALL into a Win32 API such as URLDownloadToFile, EXEC to launch a process, REGISTER an external DLL procedure, or FWRITE/FOPEN to drop a file) with an Auto_Open / Auto_Close auto-execution name. This is the canonical XLM downloader/dropper shape and is recovered directly from the BIFF records, so it fires even when the full macro chain cannot be deobfuscated.
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://rathnakumar.com/BuTxTGO63eD/solo.html In document text (OLE body)
- https://maidzonemobile.com/Voy4zCN8y1/solo.htmlIn document text (OLE body)

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