MALICIOUS
220
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The RTF file contains an embedded OLE object with a CLSID pointing to Shell.Explorer.1, which is indicative of an exploit targeting CVE-2026-21509. This vulnerability allows for arbitrary code execution when the OLE object is activated, likely through the ".objupdate" directive. The file is classified as malicious due to this exploit, and the IOCs highlight the specific components involved in the attack.
Heuristics 5
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CVE-2026-21509 — Shell.Explorer.1 CLSID in RTF critical CVE_2026_21509RTF document contains the Shell.Explorer.1 CLSID {EAB22AC3-30C1-11CF-A7EB-0000C05BAE0B} associated with CVE-2026-21509 (OLE/COM Killbit / Protected View bypass). Actively exploited in the wild.
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ClamAV: Rtf.Exploit.CVE_2026_21509-10059214-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Rtf.Exploit.CVE_2026_21509-10059214-0
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Automatically linked OLE object high RTF_OBJAUTLINKRTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
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\objupdate forces OLE activation high RTF_OBJUPDATERTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
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OLE object data medium RTF_OBJDATARTF contains 1 \objdata section(s) — embedded OLE objects
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00000107.binb8a6f8b14d9d6952dd9beb18ffca73f9b9c1d46e62ba26242c05d7fa06fbb985 |
rtf-objdata-decoded | RTF \objdata at offset 0x107 | 2609 bytes |
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