RTF malware analysis — malicious · 866480cc4f0e99ca

MALICIOUS

RTF

4.4 KB First seen: 2025-09-26

MD5: f06b593168c6ea3884dd6a0b339fc7bc SHA-1: 2215803e27439410936460d25e641a539c9df911 SHA-256: 866480cc4f0e99ca6c10128b2cb8c1e92740b798e0622b1e045c5219b7b6f36a

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating exploitation of a known vulnerability. The \objupdate directive forces the activation of this object, leading to arbitrary code execution. The specific vulnerability targeted is likely related to the Equation Editor component within Microsoft Office.

Heuristics 3

Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF 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.
\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_off000000d8.bin` `6a827f97c57e36570fd6ac26a0d482d3ceb11d25be44bb7a279af7afd83f2e03`	rtf-objdata-decoded	RTF \objdata at offset 0xD8	1912 bytes

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