RTF malware analysis — malicious · 70ed1ddba58e7b5b

MALICIOUS

RTF

56.4 KB First seen: 2025-10-01

MD5: 5ebbb75869bd013ad187a52247f5f35a SHA-1: 0aef9e6b037ad32f12b2eef4ee0b3b21329c8995 SHA-256: 70ed1ddba58e7b5be093ece536035d9b7fd540237b50d816baa00d2772672257

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that leverages a known Equation Editor vulnerability (RTF_EQUATION_EDITOR). The ".objupdate" directive forces the activation of this object, leading to code execution. The extracted objdata artifact is likely the payload or a component thereof. The exact nature of the secondary payload is not discernible from the provided evidence, but the exploit pattern strongly suggests a downloader or dropper.

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_off00001731.bin` `e82f2e80de43894ce6c539a0a3561505623898dc61bdb54da6b03f4b6e51ce40`	rtf-objdata-decoded	RTF \objdata at offset 0x1731	1930 bytes

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