RTF malware analysis — malicious · cd7f04716256f27d

MALICIOUS

RTF

1.21 MB Authoring application: Riched20 6.3.9600 First seen: 2019-05-10

MD5: ac1acdea28a589e65c90fb5cad6f4be7 SHA-1: b0ceab11f2fef52b622f82357206940671657e2c SHA-256: cd7f04716256f27dc3f3dc4606bf7c8377b9fb7269c3d450e8c8f502ecbbe760

462 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains embedded OLE objects, specifically exploiting the Equation Editor vulnerability (CVE-2017-11882). This exploit is designed to achieve arbitrary code execution, which is further supported by the detection of shellcode API strings and command strings within extracted binary artifacts. The embedded URL is benign and likely a red herring.

Heuristics 12

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
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
\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
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1256KB of hex-encoded data inside \objdata sections — may hide a payload
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://schemas.microsoft.com/SMI/2005/WindowsSettings 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	628379 bytes
SHA-256: `f10f77e2e9b2721b4d114792df7cb2f1dfedb6383f4581ac7a6b0ea66d7c0c73`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS, SC_STR_SHELLEXEC, SC_STR_GETPROCADDRESS Static shellcode analysis recovered API/import strings: LoadLibraryW, GetProcAddress, ExitProcess, CreateThread, LoadLibraryExA, VirtualProtect
`objdata_01_off00132e74.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x132E74	3980 bytes
SHA-256: `a05d7f46ada848afbe941fa4655697465916714187b3a994579528ed20e68b34`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\pictures.exe &��D$,f-Q��%
`objdata_02_off001350ba.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1350BA	3546 bytes
SHA-256: `05d465448c017f9a9b58b77c649d02ca7ca006b5095c28597a402b5709b50641`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\pictures.exe AC

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