RTF malware analysis — malicious · 297246cd26fc7afe

MALICIOUS

RTF

211.9 KB First seen: 2020-09-07

MD5: debaa1708a392ec0907bbc7e70ae2e9f SHA-1: db43e4aa7848d3a02e81c93eae64b292239ace78 SHA-256: 297246cd26fc7afeb902ba9e035ab231c4ef751dec05df1ef48edc90ab7c3198

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains embedded OLE objects and triggers heuristics related to CVE-2017-8570, which is known to drop SCT scripts. The document body includes a lure instructing the user to 'click Enable Editing to view the document', indicating an attempt to bypass macro security. The embedded artifacts suggest the execution of a script, likely JavaScript, to further the attack.

Heuristics 8

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 4 \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.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000bd0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xBD0	12323 bytes
SHA-256: `fa61bb01bf96e35c2f6ed067dbe5c85d1d489114a74030e3971a0b4fc6ed6b81`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): Wscript.Shell"" ) ") Carved artifact contains 2 shell/COM execution token(s).
`objdata_01_off00006d22.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6D22	12261 bytes
SHA-256: `cfdf79b95584afe599f8bd01e391d8904839d9495e407a353433d3f5e3be3602`
`objdata_02_off0000cd32.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xCD32	2632 bytes
SHA-256: `efcad781cab3d633c5a53c0b86b2c30761dd037463d8eb36ded19f59f1126d89`

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