MALICIOUS
160
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
The RTF document contains embedded OLE objects, specifically targeting the Equation Editor component. The presence of RTF_EQUATION_EDITOR and RTF_OBJAUTLINK heuristics indicates an attempt to exploit a known vulnerability in the Equation Editor to achieve arbitrary code execution. The ".objupdate" directive further suggests that the embedded object is designed to be activated automatically upon opening the document, likely leading to the download and execution of a secondary payload.
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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Automatically linked OLE object high RTF_OBJAUTLINKRTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
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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_off00000fbe.bin8f9ca013a52a212b47fcceb7d26d691fb0ed5b5283c87e2e45f73ab2b5a2c407 |
rtf-objdata-decoded | RTF \objdata at offset 0xFBE | 1697 bytes |
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