MALICIOUS
220
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1027 Obfuscated Files or Information
The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The presence of excessive hex-encoded data within the object suggests it is used to hide a malicious payload. No specific family could be identified, but the exploit method is clear.
Heuristics 5
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Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE_2017_11882_RELATEDRTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
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Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITORRTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
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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 ~1707KB 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_off0000003e.bin0469b7bcf88dd470ddaa14e2ad338c6f5f5f17238e367d9fc8f858d3e433e589 |
rtf-objdata-decoded | RTF \objdata at offset 0x3E | 853574 bytes |
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