RTF malware analysis — malicious · 7e123df6e3f5b7c3

MALICIOUS

RTF

66.3 KB Authoring application: riched20 6.3.9600 First seen: 2024-12-03

MD5: 52b9edce3719a332f117735c74d70b27 SHA-1: 027c2f05b720790bd29b96a54c42ea9625c6291d SHA-256: 7e123df6e3f5b7c3f91c57a9f7d7511db49e7f406e0f479df405cbc86ab92898

382 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1059 Command and Scripting Interpreter T1059.003 Command and Scripting Interpreter: Windows Command Shell T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The RTF file contains a critical vulnerability exploit for CVE-2017-11882, leveraging a malformed Equation Editor OLE object. This exploit is designed to download and execute a PE file from the embedded URL http://21-3-94e8.4everland.app/ttpayment.exe. The presence of the OLE object and the specific CVE exploit strongly indicate a malicious intent to compromise the user's system.

Heuristics 9

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.
Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
PE header (with DOS stub) in hex data critical RTF_MZ_HEX

Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
\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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://21-3-94e8.4everland.app/ttpayment.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000fe.bin` `a7a47ee971a476f4545d788086383c6881c2c38f11a2b06d3e6669542c6e9cb6`	rtf-objdata-decoded	RTF \objdata at offset 0xFE	33458 bytes

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