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, specifically a decoded Equation Editor payload. The \objupdate directive forces the activation of this OLE object, which is known to be a vector for exploiting vulnerabilities like CVE-2017-11882. The decoded object is a PE file, indicating it's likely a secondary stage payload. The presence of RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics strongly suggests exploitation of the Equation Editor vulnerability to achieve code execution.
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_off00001a72.bin3fc3185753d4b5d931e3c4910b942f959214eb1287e355863e83a779de57f6f0 |
rtf-objdata-decoded | RTF \objdata at offset 0x1A72 | 2154 bytes |
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