MALICIOUS
220
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The file is an RTF document that contains embedded OLE object data and triggers an ".objupdate" command, indicating an attempt to activate the embedded object. Heuristics and ClamAV detection strongly suggest exploitation of CVE-2017-11882 via the Equation Editor, a known method for client-side code execution. The presence of RTF_EQUATION_EDITOR and RTF_OLE10NATIVE_STREAM firings confirms this. This technique is commonly used to deliver secondary payloads, hence the high confidence in the attack pattern.
Heuristics 5
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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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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_off0000138d.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x138D | 4650 bytes |
SHA-256: c3b61d2d007973ce63446e5f5a0e43e938332a7a922ee6b22d5c7b1986d01663 |
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