MALICIOUS
120
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1059.001 PowerShell
The sample is an RTF document that contains embedded OLE object data. Heuristics indicate the presence of a decoded Equation Editor payload and that \objupdate forces OLE activation. This strongly suggests exploitation of a known Equation Editor vulnerability to achieve code execution. The decoded object is a Portable Executable, likely a downloader or initial payload.
Heuristics 3
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Decoded Equation Editor payload + PE critical RTF_EQUATION_EDITORRTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
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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 2 \objdata section(s) — embedded OLE objects
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off0000055e.binea0cf3faf61fd11f549a8f95bf8daa8768b79eeff102534d11f2412a330f32c6 |
rtf-objdata-decoded | RTF \objdata at offset 0x55E | 2076 bytes |
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