MALICIOUS
240
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The RTF file contains an embedded OLE object specifically identified as Microsoft Equation Editor, triggering critical heuristics for exploitation. This strongly indicates the file is designed to exploit a known vulnerability in Equation Editor, likely CVE-2018-0802, to achieve arbitrary code execution. The presence of the ".objupdate" directive further suggests an attempt to automatically activate the embedded exploit upon opening.
Heuristics 6
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ClamAV: Rtf.Exploit.CVE_2018_0802-6624871-1 critical CLAMAV_DETECTIONClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6624871-1
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Equation Editor object class critical RTF_OBJCLASS_EQUATIONObject class 'equation.3' references Equation Editor
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Equation Editor ProgID + OLE object high RTF_EQUATION_EDITORRTF references Equation.3 ProgID alongside \objdata — likely Equation Editor (CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798) but without the binary CLSID payload, so flagged at HIGH instead of CRITICAL.
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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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OLE object data medium RTF_OBJDATARTF contains 1 \objdata section(s) — embedded OLE objects
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Embedded OLE object medium RTF_OBJEMBRTF contains \objemb — embedded OLE object
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off0000010c.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x10C | 16936 bytes |
SHA-256: b73d753b4eaad1519310f24381866260c56edc7476f27a1c1de751cca863bfdd |
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