RTF malware analysis — malicious · 3cad854eda956373

MALICIOUS

RTF

12.6 KB First seen: 2023-02-23

MD5: 4b3501435442bb8f881f2bcb42131653 SHA-1: ddb0fbaf344958d5469bdc6f4143a1f88278243a SHA-256: 3cad854eda95637323863a0bdb6b13dd7865ff83aa3a66d97fe55b693be98696

120 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The presence of \objdata and \objupdate heuristics indicates that the document is designed to exploit this vulnerability, likely to download and execute a secondary payload. No specific family could be identified, but the attack pattern is consistent with exploit-laced documents.

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_off000011a0.bin` `60ecb523466d27f677f292e80ca320b406a5770433ba2ef8c5604adf7ed09fcd`	rtf-objdata-decoded	RTF \objdata at offset 0x11A0	1776 bytes

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