MALICIOUS
160
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The RTF file contains an embedded OLE object with split hex Equation Editor ProgID and excessive hex data, strongly indicating exploitation of a known Equation Editor vulnerability. The presence of \objupdate further suggests automatic OLE activation, which would trigger the exploit. The large amount of hex-encoded data within the OLE object likely hides a secondary payload, but its specific nature cannot be determined from the provided evidence.
Heuristics 4
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Split hex Equation Editor ProgID + OLE object critical CVE likely 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 ~5880KB 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_off00000105.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x105 | 2940353 bytes |
SHA-256: 18f9722acadcac279832d9a6e241f34a0c7e717bce9f8d3a6dc5fcd1ba6e9680 |
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