RTF malware analysis — malicious · ad33071cc79da45d

MALICIOUS

RTF

51.1 KB First seen: 2025-12-11

MD5: 52e0cd721f006f7d74d9c801210aa882 SHA-1: 1b34acb4aae9e43564df563c7db91dbbbb89c728 SHA-256: ad33071cc79da45d8c40aff73925403acfbd946da48b24ce0c4479f7ad21f660

120 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The RTF file contains an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). The ".objupdate" directive forces the OLE object to activate, which is a common technique for delivering malicious payloads. The file's structure and heuristic firings strongly indicate it's designed to download and execute a secondary stage, likely a downloader or RAT.

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_off000014a4.bin` `48eb39631f0291a6b7274848067da2853a22f3821ededc452f68a0d209a44f14`	rtf-objdata-decoded	RTF \objdata at offset 0x14A4	1776 bytes

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