MALICIOUS
120
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 User Execution: Malicious File
The sample is an RTF document that contains embedded OLE objects, specifically triggering the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The ".objupdate" directive (RTF_OBJUPDATE) forces the activation of these embedded objects, leading to exploitation. This technique is commonly used to deliver secondary payloads, such as malware downloaders or droppers. No specific family could be identified, but the exploitation vector is clear.
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_off000005d1.bin6119ea4ad2c2b4d2306cad23d56397b5b8bf47e74b63d384bf7ea982dbf777e8 |
rtf-objdata-decoded | RTF \objdata at offset 0x5D1 | 1838 bytes |
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