MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
The RTF file contains critical heuristics indicating the exploitation of the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The presence of OLE object data and the ".objupdate" directive further suggest that the embedded OLE object is designed to be activated, likely to trigger the exploit. This pattern is commonly used to download and execute a secondary payload, hence the high confidence in this attack vector.
Heuristics 4
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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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OLE object data medium RTF_OBJDATARTF contains 2 \objdata section(s) — embedded OLE objects
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Embedded OLE object medium RTF_OBJEMBRTF contains \objemb — embedded OLE object
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00000dea.bin56fa3814862f8311ec3c037524140fa03677fa60cdace0cde3f86da237c887fd |
rtf-objdata-decoded | RTF \objdata at offset 0xDEA | 45245 bytes |
objdata_01_off0002f98f.bina8f8fe297b9e240bebca1d0300f2afca1b0fefd86601c082b5569a106f19c96b |
rtf-objdata-decoded | RTF \objdata at offset 0x2F98F | 359082 bytes |
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