MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1204 Malicious Link
T1566.001 Phishing: Spearphishing Attachment
T1204.002 Malicious Link: Malicious File
The sample is an RTF document containing an embedded OLE object that exploits a vulnerability in Microsoft Equation Editor. The presence of RTF_OBJDATA, RTF_OBJEMB, RTF_EQUATION_EDITOR, and RTF_OBJUPDATE heuristics strongly indicates the use of a known exploit technique to achieve code execution. The document body is heavily obfuscated and does not provide clear textual lures, suggesting the exploit is the primary 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 1 \objdata section(s) — embedded OLE objects
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Embedded OLE object medium RTF_OBJEMBRTF contains \objemb — embedded OLE object
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00001f98.bin8f4bf4d0622cca432a3b1b1245d0f47d059c4591fc004401ff04983ccfef2842 |
rtf-objdata-decoded | RTF \objdata at offset 0x1F98 | 18696 bytes |
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