RTF malware analysis — malicious · ed8e9e20dc43f039

MALICIOUS

RTF

1.74 MB First seen: 2020-05-25

MD5: 32c154df19c6e10c3908bf5b2bac1e82 SHA-1: 19a09510880b0b717e80dd340c35ef56c68e4de8 SHA-256: ed8e9e20dc43f039d5579b82f0584368babb7c11cf5d2a4c89b0200cbd1be675

402 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains multiple critical heuristic firings indicating the exploitation of CVE-2017-8570, which is known to drop a script file (SCT) for execution. The presence of OLE object data, composite monikers, and PE headers within hex data strongly suggests the file is a dropper. The embedded URL is benign and likely a red herring.

Heuristics 10

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 ~1647KB 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.
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000031.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x31	823500 bytes
SHA-256: `d0cdcd9b8d4f1bfa5e7cf1bbb47c48f85b17b4285ab0947e1891b0b4b6c8a959`
`objdata_01_off001aa82f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1AA82F	32399 bytes
SHA-256: `80a8cff4c375acafce1dbd4cfe7660558c078465352c9a622f13460c7621a5e2`
`objdata_02_off001ba585.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1BA585	381 bytes
SHA-256: `3458e1d85410d8b0a08c68591e0912e582782375d61f43343a9a5d6983b8c436`
`objdata_03_off001ba8bb.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1BA8BB	788 bytes
SHA-256: `9f474d871d5073e0821f436fc51680b1a4730c0843652540921f90acc5b5f4a5`
`objdata_04_off001baf61.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1BAF61	2247 bytes
SHA-256: `992c836552ac8953ea96f98fe3fdf2f015904931030078610b1ec4c608451d62`
`objdata_05_off001bc185.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1BC185	4679 bytes
SHA-256: `a031167f29c59aa6f60f009231ba4b3342834ba008154b405252e98bc2ed362a`

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