RTF malware analysis — malicious · 392b49b0aeaad815

MALICIOUS

RTF

2.74 MB Created: 2018-05-21 15:22:00

MD5: 99c8f60eaa949a9c453dd525af395640 SHA-1: 9598891123fe6ef65ebe1f33fd0ec4b00de42236 SHA-256: 392b49b0aeaad81598730391caf08cdfba447576c2c9729bf78c3b9d0b333ef3

520 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.001 Component Object Model

The RTF document contains embedded OLE objects, specifically leveraging the Equation Editor, which is known to be vulnerable to CVE-2017-8759 and CVE-2026-21514. The presence of large hex-encoded data blocks and a PE header within the OLE object data strongly suggests that the document is designed to exploit these vulnerabilities to download and execute a secondary payload. ClamAV detections further confirm the malicious nature of the embedded content.

Heuristics 13

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.
CVE-2026-21514 — Word/OLE security bypass in RTF high CVE likely CVE_2026_21514

RTF document contains an embedded OLE object with an Ole10Native stream. CVE-2026-21514 exploits OLE stream metadata validation in Word; the Ole10Native stream is used to deliver payloads and trigger the bypass when the document is opened.
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
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: Win.Packer.MalwareCrypter-6620810-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Packer.MalwareCrypter-6620810-1
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
\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 ~2603KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 2 \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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002a87.bin` `033fbe5c320173bffc7d066a5f8ef4b64ba644ac3620336878dd37cc08550131`	rtf-objdata-decoded	RTF \objdata at offset 0x2A87	1301505 bytes
Detection ClamAV: Win.Packer.MalwareCrypter-6620810-1 Obfuscation or payload: unlikely
`objdata_01_off00299054.bin` `a86b0432fbd7cb75064976500e08db0dd557c6912f2c9cdd1f530b650111c3a9`	rtf-objdata-decoded	RTF \objdata at offset 0x299054	23598 bytes

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