RTF malware analysis — malicious · c7f7fa7f575dc10a

MALICIOUS

RTF

662.3 KB

MD5: d47d8aab61173e2a8625a4ca5456fff5 SHA-1: a5d8a7e021de5b4d2b2f05421263017341f18d37 SHA-256: c7f7fa7f575dc10a81ef3a38e4b9d5f34a790dedf7a965f0c2603c7ad17a1ae9

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains multiple indicators of malicious OLE object embedding, including composite monikers and automatic updates, strongly suggesting exploitation of CVE-2017-8570. The document body explicitly instructs the user to 'Enable Editing', a common lure to bypass security measures and execute embedded malicious content. The exploitation of CVE-2017-8570 typically involves dropping and executing a script, likely JavaScript, to download and run a secondary payload.

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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 4 \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

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000965.bin` `ef669ac4267fc19e1a4aeef9e13e8216c1cf46197b49ab023e8871afa14577f2`	rtf-objdata-decoded	RTF \objdata at offset 0x965	221069 bytes
`objdata_01_off00007114.bin` `814a51a72453e896a05beed420d8b3813a78f928e5b93d7eb6c73bc0d0ed10e1`	rtf-objdata-decoded	RTF \objdata at offset 0x7114	221042 bytes
`objdata_02_off000775ab.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0x775AB	2632 bytes
`objdata_03_off00078b4e.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x78B4E	12297 bytes

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