RTF malware analysis — malicious · f14a49bc21e63284

MALICIOUS

RTF

20.6 KB Authoring application: Riched20 6.3.9600 First seen: 2019-12-09

MD5: 8d88b86a99486d619c4e98d33c5e8e30 SHA-1: 362d7def11410b2afc3b48fb62a5eeabd6328a8a SHA-256: f14a49bc21e63284df713b631d0bce8c5c41ba79d897d6b15720ed21af7dc0c0

362 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects and specifically triggers the CVE-2017-11882 vulnerability in the Equation Editor. This exploit is designed to execute arbitrary code, likely to download and run a second-stage payload from the identified URL.

Heuristics 10

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
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.
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.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
OLE object data medium RTF_OBJDATA

RTF contains 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM

RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
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://45.11.19.145/mswiner.exe In RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000ed.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xED	2102 bytes
SHA-256: `cd9967a4e3c38a5b1239bc6ab38c130a4d9296c572ad9e5c2955c8e62d6ae1f6`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell',
`objdata_01_off000011a8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x11A8	3980 bytes
SHA-256: `a29f2b17cf63b8b950ba28f0b8685e8452b497c46bab34d666dfed6e955da186`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\test.js &��D$,f-Q��%
`objdata_02_off000033e2.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x33E2	3546 bytes
SHA-256: `a539bd5c47415e600272ae8712c81d03ef4f0fa46c266998f809d0bd5aa55648`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\test.js AC

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