MALICIOUS
542
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The RTF file contains an embedded OLE object that exploits CVE-2017-8759, a known vulnerability for client execution. The presence of large hex-encoded data within the OLE object and a suspicious extracted artifact named 'objdata_01_off00299061.bin' suggests it likely serves as a dropper for a secondary payload. The ClamAV detection further confirms its malicious nature.
Heuristics 13
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Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOREquation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
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CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
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Composite Moniker in RTF OLE object high RTF_COMPOSITE_MONIKER_RELATEDRTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
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Ole10Native stream in RTF OLE object high RTF_OLE10NATIVE_STREAMRTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
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ClamAV: Win.Malware.Sysn-7439988-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Win.Malware.Sysn-7439988-0
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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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Package object class high RTF_OBJCLASS_PACKAGEOLE Package object — can wrap arbitrary files
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Large hex data blocks in OLE object high RTF_EXCESSIVE_HEXRTF contains ~2603KB of hex-encoded data inside \objdata sections — may hide a payload
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Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGEOne or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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OLE object data medium RTF_OBJDATARTF contains 2 \objdata section(s) — embedded OLE objects
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Embedded OLE object medium RTF_OBJEMBRTF contains \objemb — embedded OLE object
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OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAMRTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
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Embedded URL info EMBEDDED_URLOne 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 http://schemas.microsoft.com In RTF body
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00002a8a.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x2A8A | 1301505 bytes |
SHA-256: 4d20788d51afe2f5e150d6d3b2cfa93a67a8fcaf234c8ffbd12dd4a389b31e24 |
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Detection
ClamAV:
Win.Malware.Sysn-7439988-0
Obfuscation or payload:
unlikely
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objdata_01_off00299061.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x299061 | 23598 bytes |
SHA-256: 9d6812245bb9a9acb8a063c32175f2d2d79fdda37feb88384d730b4323f75b05 |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS Static shellcode analysis recovered command string(s): cmd.exe /c %tmp%\A.X %
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