MALICIOUS
120
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The sample is an RTF document containing embedded OLE objects and triggering heuristics for the Equation Editor vulnerability. The ".objupdate" directive forces OLE activation, indicating an attempt to exploit this vulnerability for code execution. This is a common method for delivering secondary payloads, hence the high confidence in an exploitation attempt.
Heuristics 3
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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
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00001212.bin6b5d91a5b0ecf20ad0c9b269ced159301323f244d6c5955272549dbd2c202b22 |
rtf-objdata-decoded | RTF \objdata at offset 0x1212 | 1387 bytes |
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