RTF malware analysis — malicious · bb9dccdecafb704c

MALICIOUS

RTF

1.42 MB First seen: 2020-01-07

MD5: 081c27d59fb96260f1bb8e815eaa569a SHA-1: 9c260629a6332bfc8244f3924b2a32f38d3ee603 SHA-256: bb9dccdecafb704c82f1085ceec82cba6930c0129195166757a4ad5ddbee2133

482 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The RTF file contains multiple indicators of exploitation for CVE-2017-8570, including Composite Moniker and Equation Editor CLSID firings. The embedded OLE object data, particularly objdata_06_off0002d62f.bin, likely contains the second-stage payload, as indicated by the presence of a PE header in hex data and ClamAV detections on extracted artifacts. The exploit facilitates client execution by leveraging the vulnerability to drop and run a malicious binary.

Heuristics 11

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.
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
Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
ClamAV: Win.Malware.Generic-6698728-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Malware.Generic-6698728-0
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
\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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1487KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 8 \objdata section(s) — embedded OLE objects
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.
Suspicious extracted artifact medium 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.
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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000002f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2F	887 bytes
SHA-256: `63c0c8928d7dba416d73c39a7f0eaf44893fd70add55efa5088566e0f4599c0d`
`objdata_01_off00018d7e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x18D7E	32723 bytes
SHA-256: `3fca7b40dcf3f43c9a43e31ee39f2d0e507133db992591f2202f737c0a0443fb`
`objdata_02_off00028d5c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x28D5C	482 bytes
SHA-256: `5335740b0cd34b41db1162eb5c2c304105d851714fd2d00522c05285a960dc0e`
`objdata_03_off0002915c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2915C	815 bytes
SHA-256: `715448127c85e8696ae7bc145be5f7c9fd53c9299e296ab30d9a6e529b53c2f9`
`objdata_04_off0002982b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2982B	2633 bytes
SHA-256: `1feb5f150bb35566d1a01fc59a357dc0ea34bc7498e0ec99bd939f6f848044b0`
`objdata_05_off0002ad38.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2AD38	4681 bytes
SHA-256: `c4bb3f784feda536c3c8a254c5e4985ff95fb94510d6c6900c5e6ad04d5ce6fc`
`objdata_06_off0002d62f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2D62F	651980 bytes
SHA-256: `c34f56a423678352aa0cb28f6382a075b89cfffa76b15723e00a4eb005f1303e`
Detection ClamAV: Win.Malware.Generic-6698728-0 Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_MSF_REVERSE, SC_STR_VIRTUALALLOC, SC_STR_LOADLIBRARY Static shellcode analysis recovered API/import strings: LoadLibraryExA, VirtualAlloc, GetProcAddress, ExitProcess

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