MALICIOUS
200
Risk Score
Malware Insights
MITRE ATT&CK
T1204.002 Malicious File
T1566.001 Spearphishing Attachment
T1059.001 PowerShell
The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-11882) to achieve code execution. The critical heuristic firings for RTF_EQUATION_EDITOR and CVE_2017_11882 directly indicate this exploit. The presence of OLE object data and the extobjupdate directive further support the exploitation of embedded objects. The document body is heavily obfuscated and does not provide clear textual lures, but the exploit itself is the primary indicator of malicious intent, likely to download and execute a secondary payload.
Heuristics 5
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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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Equation Editor CLSID critical RTF_EQUATION_EDITOREquation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
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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
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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_off00001a7c.bin5fea775148a1c200e4352ab32a90ad05e019975a044a67a69201ffeb1df486dc |
rtf-objdata-decoded | RTF \objdata at offset 0x1A7C | 3677 bytes |
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