MALICIOUS
362
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The RTF file contains multiple critical heuristic firings indicating exploitation of CVE-2017-8570, CVE-2017-8759, and CVE-2026-21514. These vulnerabilities allow for the execution of arbitrary code, likely to download and run a secondary payload. The presence of OLE object data and composite monikers further supports the exploitation of these vulnerabilities for initial execution.
Heuristics 10
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Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE_2017_8570RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
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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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CVE-2026-21514 — Word/OLE security bypass in RTF high CVE likely CVE_2026_21514RTF contains a hidden \svb hex package with DrsE2oDoc and downRevStg drawing compatibility parts. This matches an observed CVE-2026-21514 exploitation shape that manipulates Word's internal document structure and trust decisions.
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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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Large hex data blocks in OLE object high RTF_EXCESSIVE_HEXRTF contains ~1651KB 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 3 \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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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/office/word/2003/wordml In RTF body
Extracted artifacts 4
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00540dff.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x540DFF | 96076 bytes |
SHA-256: cd6eb1e1caeb93327ff7d83d81098a9a3719c4806a6c1e453339037a78fd4e44 |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Static shellcode analysis recovered command string(s): WScript.Shell"")")
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objdata_01_off00571b3a.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x571B3A | 2632 bytes |
SHA-256: ad7bf1923f855fca5949d0c557a2a819b106cd84b204870bcc59064eb0c6e331 |
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objdata_02_off005730dd.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x5730DD | 12297 bytes |
SHA-256: 44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037 |
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rtf_svb_00004896.zip |
rtf-svb-package | RTF \svb hex-decoded ZIP at offset 0x4896 | 819490 bytes |
SHA-256: 24a53a09dd578ae9726b4a2c5f1f2f62fcce17cc0dd17d3ba3b092212bc43d09 |
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