RTF malware analysis — malicious · cda65753e2459754

MALICIOUS

RTF

226.7 KB First seen: 2022-08-23

MD5: 74ab9855f26b0cc2fca1fefd566f5642 SHA-1: 09ebb7681f9989b7e98a17cbbff3cd7783712874 SHA-256: cda65753e2459754b1afd749ac2ce1c65415de966179e9bb53e822321c02c7ff

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204 User Execution: Malicious Link T1204.002 User Execution: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059.005 Command and Scripting Interpreter: Visual Basic

The RTF document contains OLE objects and triggers heuristics related to CVE-2017-8570, indicating it exploits a vulnerability to drop a script. The document body explicitly instructs the user to 'download the document and click Enable Editing', a typical social engineering lure to bypass security measures and execute embedded malicious content. The embedded OLE object likely contains the payload, which is designed to be executed upon user interaction.

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.
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
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
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_off0000095d.bin` `004d2740ee912b6097e4955a6fd7bc3b8f4fbe530ae101f962d8181219c90ed2`	rtf-objdata-decoded	RTF \objdata at offset 0x95D	20059 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000acf5.bin` `3c97121fe02f90da16cb2983b3ae893ea40de52f15d26984fbdbae19aab20ebc`	rtf-objdata-decoded	RTF \objdata at offset 0xACF5	2632 bytes
`objdata_02_off0000c298.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xC298	12297 bytes

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