equation editor exploit RTF malware analysis — malicious · 540a08dfe14cc84d

MALICIOUS

RTF

8.2 KB First seen: 2019-05-31

MD5: 64356ae2c95c01fc0e0b9890e6823ad6 SHA-1: 37fc25d9b11051351b354dfa84f2108c175713c9 SHA-256: 540a08dfe14cc84db73fa353e9bcf10a51909a6707d321ebb5d8d9c56ee19a0e

180 Risk Score

Malware Insights

equation editor exploit · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that triggers the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution, indicating the file is designed to exploit this known flaw. The presence of the ".objupdate" directive further suggests an attempt to activate the embedded object.

Heuristics 4

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation 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.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF 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_off00000033.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x33	4158 bytes
SHA-256: `9bbd8abd57b2a9e4e2129e2c90c39849198d6bd2a5c470fe831872236440687e`

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