RTF malware analysis — malicious · b32161c4d2cf99e3

MALICIOUS

RTF

223.0 KB First seen: 2019-11-20

MD5: ac3c23b4711c9d9176ee521c0cd260ea SHA-1: 95ce3412886cbfff5c3e6961b62f6ef3df77e2e3 SHA-256: b32161c4d2cf99e3192686881c72a98027d3021fb8172660c898e58da809b3fb

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains OLE object data and triggers the CVE-2017-8570 vulnerability, which is known to drop and execute SCT scripts. The presence of composite monikers and objdata sections strongly indicates exploitation for client execution. No specific family could be identified, but the exploit mechanism is clear.

Heuristics 7

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.
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.
\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.
Suspicious extracted artifact high 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.
OLE object data medium RTF_OBJDATA

RTF contains 3 \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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00005193.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x5193	9093 bytes
SHA-256: `e9674e242237a8e6cc7f7bb7867c626c10f88f0882b8b61435c279c57ee0a6e8`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Sh"
`objdata_01_off000099a2.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x99A2	12261 bytes
SHA-256: `010714f1a05164de42b9cf9db473155bac2155f3569c1db08838e973f2cd6269`
`objdata_02_off0000f9b4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xF9B4	2632 bytes
SHA-256: `cd422fad722349d22695a105a39c207bb6dc345f5ecfd1a9b29a77859048a591`

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