MALICIOUS
522
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1059.001 PowerShell
The RTF file contains an embedded OLE object that exploits CVE-2017-11882 in Equation Editor. This exploit likely facilitates the execution of a secondary payload, as indicated by the detection of shellcode candidate regions and command strings within extracted artifacts. The ClamAV detection name 'Win.Dropper.Ursu-6848742-0' further supports the dropper functionality.
Heuristics 12
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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-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
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ClamAV: Win.Packed.Ursu-7339096-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Win.Packed.Ursu-7339096-0
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PE header (with DOS stub) in hex data critical RTF_MZ_HEXHex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
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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 ~1000KB 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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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://www.usertrust.com1 In RTF body
- http://ocsp.usertrust.com0In RTF body
- http://crl.usertrust.com/UTN-USERFirst-Object.crl05In RTF body
Extracted artifacts 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off000000ef.bin |
rtf-objdata-decoded | RTF \objdata at offset 0xEF | 492181 bytes |
SHA-256: 1712ade874bc69b35b1aafe8a475ffddc8bd95b127a38b666e3f3e83c9eb7779 |
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Detection
ClamAV:
Win.Packed.Ursu-7339096-0
Obfuscation or payload:
likely
Carved artifact entropy is 7.56, consistent with packed or encrypted content.
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objdata_01_off000f0668.bin |
rtf-objdata-decoded | RTF \objdata at offset 0xF0668 | 3980 bytes |
SHA-256: 131813d3ee15cbc62797d7e9225ce3fe7952f51dfa0ff9549823664cf27ff4d0 |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\jona.exe &��D$,f-Q���%
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objdata_02_off000f28ae.bin |
rtf-objdata-decoded | RTF \objdata at offset 0xF28AE | 3546 bytes |
SHA-256: 3efd27419e7accd780d3e7fdd57a0b3f511e5044b1b29b930e2d5b2e55896ff6 |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\jona.exe A C
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