MALICIOUS
460
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The sample is an RTF document containing embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability via the Equation Editor. This exploit allows for the execution of arbitrary code, likely leading to the download and execution of a secondary payload. The presence of PE headers in hex data and ClamAV's detection of Rtf.Exploit.CVE_2017_11882-6584355-1 further confirm the malicious nature of the file.
Heuristics 11
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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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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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ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTIONClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
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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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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.
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 | 271600 bytes |
SHA-256: 66c6d27504631beb0105e13887a6a286c54f447866f1e2adb6009b4b23a327bf |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact entropy is 7.94, consistent with packed or encrypted content.
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objdata_01_off00084b1e.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x84B1E | 3980 bytes |
SHA-256: 48e76013cfeda5e9a94f082e775a5cb6b54c98d7529d5d28c472b7f6eef3d4e3 |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\Windows.exe &��D$,f-Q���%
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objdata_02_off00086d64.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x86D64 | 3546 bytes |
SHA-256: 255e86b121e583046ff506f12b61d2353ac7432188993e8631fee626ca764ed5 |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\Windows.exe A C
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