MALICIOUS
121
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.001 Malicious Link
T1059.003 Windows Command Shell
The sample is an RTF document that contains embedded OLE object data. Heuristic analysis indicates that this data decodes to a PE file, likely exploiting the Equation Editor vulnerability (CVE-2017-11882). The \objupdate directive forces the activation of this embedded object, leading to the execution of the decoded payload. The decoded object itself is a PE file, suggesting it's a secondary stage downloader or dropper.
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_off00000b1f.bin5c34b3fcdc0dcf6ae0f1efcfd88821131c4a602310513506ec91c86afb09e98e |
rtf-objdata-decoded | RTF \objdata at offset 0xB1F | 1934 bytes |
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