RTF malware analysis — malicious · 19b3515a29b268e7

MALICIOUS

RTF

662.3 KB

MD5: 9da7fc869ade4f77ea7560cf625666ad SHA-1: b8cf9538fe6ee86eeb9dedf89975de8060f4d43d SHA-256: 19b3515a29b268e7fcac175599999e5bd24926de5f328536f0e1fc14dad7aa7a

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious OLE object embedding, specifically related to CVE-2017-8570 which is known to drop SCT scripts. The document body includes a lure instructing the user to 'Enable Editing', a common tactic to bypass macro security. The presence of OLE object data and composite monikers strongly suggests the file is designed to exploit this vulnerability and execute a secondary payload, likely a script.

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` `7031d74f4ebdb7d3ffd9d867bcb71ba1a6cd333ea330e020802971b9f3273136`	rtf-objdata-decoded	RTF \objdata at offset 0x965	221101 bytes
`objdata_01_off00007114.bin` `37a7cbdb9bd291fe5da6682adb4358e3271f2656d7c14dbb349a812b5de7a7aa`	rtf-objdata-decoded	RTF \objdata at offset 0x7114	221074 bytes
`objdata_02_off000775ef.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0x775EF	2632 bytes
`objdata_03_off00078b92.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x78B92	12297 bytes

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