RTF malware analysis — malicious · 43aa07a7a6b8c738

MALICIOUS

RTF

500.0 KB

MD5: ffe7057ef26bed20c4ddcb571278aa87 SHA-1: 94fe05cb4a0894ca2cd514dc5c0a1256ca35b362 SHA-256: 43aa07a7a6b8c73863baf843a34f00e922e785ad4bfb06ed6b23a27ed8466da9

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects and triggers heuristics related to CVE-2017-8570, indicating an attempt to exploit this vulnerability. The embedded OLE data, specifically at offset 0x77804, is associated with the composite moniker exploit which is known to drop SCT scripts. The document body also contains a lure to 'Enable Editing', a common tactic for macro-based malware.

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_off00000bac.bin` `dc7575c2f680c4ec099b3a45e53592b59718f595b312a6aea9eceb1678ffe806`	rtf-objdata-decoded	RTF \objdata at offset 0xBAC	221077 bytes
`objdata_01_off0000735b.bin` `56bce9aea480cf2f1dc684edefa3adc2e792afe28ae29755489a5d295ba33084`	rtf-objdata-decoded	RTF \objdata at offset 0x735B	221050 bytes
`objdata_02_off00077804.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0x77804	2632 bytes
`objdata_03_off00078da7.bin` `44c17fbdc486686edca3d2782e0f4888502c0da8970b551e62ff30e439d71682`	rtf-objdata-decoded	RTF \objdata at offset 0x78DA7	8492 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.