Office (OLE) / .XLS malware analysis — malicious · d1d3c073d98a12c1

MALICIOUS

Office (OLE) / .XLS

525.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2021-05-26

MD5: 460e7062430040a1afcf692f20b833a5 SHA-1: 5204fef3a1ea1719824d033e8fbff51f30af2172 SHA-256: d1d3c073d98a12c17062652130f78143dedc10faeb199bf8f5c853e143e5602a

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The presence of an Excel 4.0 (XLM) macro sheet and a heuristic firing for content-enable lures strongly suggest a macro-based attack. The document explicitly instructs the user to enable macros, a common social engineering tactic. The embedded URLs are likely used to download and execute a secondary payload, although the exact nature of the payload cannot be determined from the provided evidence.

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://aravindanavada.com/AHt5r3T0VSlq/solo.html In document text (OLE body)
- https://mrcrgroup.com/sOyQynNJYBY/solo.htmlIn document text (OLE body)

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