MALICIOUS
260
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The file is an RTF document containing embedded OLE object data, specifically triggering heuristics related to Equation Editor vulnerabilities. ClamAV identifies this as Rtf.Exploit.CVE_2017_11882-6584355-1, indicating exploitation of the Equation Editor vulnerability. This technique is commonly used to deliver a second-stage payload, likely executed via the ".objupdate" directive.
Heuristics 6
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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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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: 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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\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 ~1352KB of hex-encoded data inside \objdata sections — may hide a payload
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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_off0014a1c1.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x14A1C1 | 3621 bytes |
SHA-256: 3dd64f074a3072dafe0bd5b6b7ec8da405fb7b1bad0f823547067fee20db71fe |
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