MALICIOUS
160
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
The sample is an RTF document that contains an OLE object with automatic linking and update flags set, indicating an attempt to execute embedded content. Critical heuristic firings confirm the exploitation of CVE-2017-11882 via an Equation Editor font record overflow. This vulnerability allows for arbitrary code execution, which is the primary mechanism for delivering a malicious payload. No scripts were extracted, and the document body was truncated, but the exploit itself is sufficient evidence of malicious intent.
Heuristics 4
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CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
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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 1 \objdata section(s) — embedded OLE objects
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00001a6d.bin4b0fdd70ecbd531c3fec7b795e9a063c9212f463ebf17712c19b7356900b87f5 |
rtf-objdata-decoded | RTF \objdata at offset 0x1A6D | 4152 bytes |
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