RTF malware analysis — malicious · 6e11dfe8bdb6da65

MALICIOUS

RTF

386.5 KB

MD5: 4c67212f5430a4ccf0d7cc0a32f888c0 SHA-1: fcff0907d99e423910bb40423c857ac7bb759b59 SHA-256: 6e11dfe8bdb6da6557dd4faaaf15122ee14516d9dc44fa0177a8d6736a691c6d

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects with composite monikers, triggering the CVE-2017-8570 vulnerability. This vulnerability is known to be used for dropping and executing script files, such as SCT files, which likely leads to further malicious activity. The file's structure and heuristic firings strongly indicate exploitation for client execution.

Heuristics 6

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.
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
Suspicious extracted artifact medium 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000007d0.bin` `3969c8a2deb7eb61423e1be45ee6404889f65d11a5151a465712a8b169a6b83f`	rtf-objdata-decoded	RTF \objdata at offset 0x7D0	98917 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00032c1f.bin` `c1062dbe2c516490ba03c091a3be0d514bef7428a936eb00367c1b3069f9cedc`	rtf-objdata-decoded	RTF \objdata at offset 0x32C1F	2632 bytes
`objdata_02_off000341c2.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x341C2	12297 bytes

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