RTF malware analysis — malicious · c964e5c34797d104

MALICIOUS

RTF

1.63 MB First seen: 2019-08-04

MD5: 61bcefcd47e8d97db713b0278f7e7a8b SHA-1: c913a000804048c721a3f85a2c7af11501a2b761 SHA-256: c964e5c34797d104cc3eef7e001ecc0f98d3d5a9fc787d667e54e7d76d5c43c4

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 ~1515KB 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	759843 bytes
SHA-256: `e74f21a160f1177bf57c62a630f8e1aea0935ddb04a37c94128acb6499d904c4`
`objdata_01_off0018d4c2.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x18D4C2	30425 bytes
SHA-256: `4419576b3dfb8c085d1dc701c590d980d74855dabc3cabac131f5f45edf45a2a`
`objdata_02_off0019c4a1.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x19C4A1	462 bytes
SHA-256: `1fc984b84321e6a82ecaf923edd7fcaabe8ab7934f072eb0370458c42b90210d`
`objdata_03_off0019c879.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x19C879	877 bytes
SHA-256: `76f3e5239d2c790a4fec1d75e41e3216cf3d21a28661c8e5153da071db1826f7`
`objdata_04_off0019cfd1.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x19CFD1	2247 bytes
SHA-256: `992c836552ac8953ea96f98fe3fdf2f015904931030078610b1ec4c608451d62`
`objdata_05_off0019e1f5.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x19E1F5	4679 bytes
SHA-256: `a031167f29c59aa6f60f009231ba4b3342834ba008154b405252e98bc2ed362a`

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