RTF malware analysis — malicious · 77aa751a94a2a106

MALICIOUS

RTF

1.09 MB First seen: 2019-05-10

MD5: fbd61861ee03e241700bc1165b9bdf68 SHA-1: af82cd7734a021caac9b69253c506b1428d9af8f SHA-256: 77aa751a94a2a1066ee4f0cdc37a262752ea18189661323d679e29dd92fcd270

404 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The RTF file contains multiple critical heuristic firings indicating the exploitation of CVE-2017-8570, which is known to drop a script file (SCT). The presence of a PE header within the OLE object data further suggests that a malicious executable payload is embedded. The file is detected by ClamAV as Rtf.Dropper.Agent-9965975-1, reinforcing its role as a dropper.

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: Rtf.Dropper.Agent-9965975-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Dropper.Agent-9965975-1
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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1126KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 7 \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 info 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_off00003da4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3DA4	884 bytes
SHA-256: `08cb831cfd094f7193857584f98ebb419e336c73f0191f78a94fb322b6fcad85`
`objdata_01_off000044d8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x44D8	32348 bytes
SHA-256: `dfeb97f1eb1b0d2620397fc615524342c384da380773c5c19ab230464ece7fd7`
`objdata_02_off000141c3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x141C3	522099 bytes
SHA-256: `dd31da27c36d959d4c4f0c67dffb31a2c6321168aeff381e98a37b8aff3091e3`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.59, consistent with packed or encrypted content.
`objdata_03_off00113101.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x113101	381 bytes
SHA-256: `b16269ed74bbb54da900998b9d0ff6db6fa04de76d87c7ece4414f4b2b9dc5a1`
`objdata_04_off0011342f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x11342F	790 bytes
SHA-256: `ac6dd4416a3c69b34bc166b4ed3a98acdc14d43308526869ffa1b6809c8901d7`
`objdata_05_off00113ac2.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x113AC2	2633 bytes
SHA-256: `1feb5f150bb35566d1a01fc59a357dc0ea34bc7498e0ec99bd939f6f848044b0`
`objdata_06_off00114fcc.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x114FCC	4806 bytes
SHA-256: `0b1f8c33edca54b24a7403860d908f696a2088e51becf7f2a5f61746c3dfc293`

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