RTF malware analysis — malicious · 4fc59853387166fa

MALICIOUS

RTF

3.47 MB Created: 2018-07-18 16:21:00 First seen: 2018-10-07

MD5: 299096d56b39901842884c20b6e3f518 SHA-1: 387fe2749681a77c0daeb60cb4361e4e00d0980c SHA-256: 4fc59853387166fa71c793ca6cdb48bb2097b6e97caf7b5bcf679960889dfdff

522 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Phishing: Spearphishing Attachment

The RTF file contains multiple OLE objects and exhibits characteristics of known exploits like CVE-2017-8570 and CVE-2017-8759, which are used to execute arbitrary code. ClamAV detections on extracted artifacts, including Win.Dropper.Razy, indicate the file's purpose is to download and run a secondary malicious payload. The presence of a PE header within hex data further supports this.

Heuristics 12

Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570

RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
ClamAV: Xml.Malware.Squiblydoo-6728833-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xml.Malware.Squiblydoo-6728833-0
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
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
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 ~2576KB 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 4 \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/office/word/2003/wordml In RTF body

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00277b6f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x277B6F	1706 bytes
SHA-256: `d5cef70edfa49a2a432394f4b5bdc1f968e2249d8445ee25af88575683676c0a`
Detection ClamAV: Xml.Malware.Squiblydoo-6728833-0 Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell").Run("%temp%\\task.bat");
`objdata_01_off00278a68.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x278A68	4632 bytes
SHA-256: `0f9f281a5b194a09d0a3efe139ea610cfb23ea265a87d257d4eb57af2a3d97a0`
`objdata_02_off0027b07e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x27B07E	386 bytes
SHA-256: `3eecfc2cda15e530ec33126ddd7561fb86b9fefbd9e02dce1dedbf145da0e2d5`
`objdata_03_off002808bd.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2808BD	484733 bytes
SHA-256: `18b6013b7cb1026396fcf41b854de6ae5eeab55ca79d8a5ba023c8b69a139e85`
Detection ClamAV: Win.Dropper.Razy-6561332-0 Obfuscation or payload: likely Carved artifact entropy is 7.95, consistent with packed or encrypted content.

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