RTF malware analysis — malicious · cfbbe350a3a5b906

MALICIOUS

RTF

245.4 KB First seen: 2020-07-24

MD5: 31355a427ccc38ba77df8c75626e33f7 SHA-1: 47d42d7885c1f27ebdae079d70a72042c94debe9 SHA-256: cfbbe350a3a5b906db87fa22e8a58a1760cfa776e6f1e0149b73a02b799d9b3a

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 to 'Enable Editing', indicating an attempt to bypass security measures and execute embedded content. The embedded OLE object likely contains shellcode or a script designed to exploit this vulnerability.

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_off00000ba8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xBA8	29494 bytes
SHA-256: `bbe0686f9e7e93ef84c3c5aedccc9be8c76314aefc17644f00fc097975b10358`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): Wscript.Shell"" ) ")
`objdata_01_off0000f319.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xF319	12261 bytes
SHA-256: `12289ea42203fe86d5d6e86e52672f752ead5709842d0443203b40a4917d5ece`
`objdata_02_off00015329.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x15329	2632 bytes
SHA-256: `ff4e9aaf9384b52652b79eaca517ccbf97d52846b4e013a0558d5ada8d82dc18`

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