RTF malware analysis — malicious · d0563b9b9ebad52a

MALICIOUS

RTF

375.9 KB

MD5: d554021000b6763797cdd812439b9b9c SHA-1: e30af862b0d00c861cf3f536cbb6e2c96abf9011 SHA-256: d0563b9b9ebad52a22ce9eeafbba8a55b9fb64cdfeeb3cf87fde7f35c4a2d24d

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects, with a critical heuristic identifying the CVE-2017-8570 vulnerability. This vulnerability is known to be used for dropping and executing script files, likely to download a second-stage payload. The document body contains a lure instructing the user to 'Enable Editing', which is a common tactic for macro-enabled 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` `990124c7c806dfa2da3f1de90577d912cdef5a7f512da06c1648bd45475a905e`	rtf-objdata-decoded	RTF \objdata at offset 0xBAC	79788 bytes
`objdata_01_off0000735b.bin` `c916b45891d5344497c1bc1c8ae6e21eeea9d6ed74c3df7dc8d156f7e6e85831`	rtf-objdata-decoded	RTF \objdata at offset 0x735B	79761 bytes
`objdata_02_off0002fc0a.bin` `a8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379`	rtf-objdata-decoded	RTF \objdata at offset 0x2FC0A	2632 bytes
`objdata_03_off000311ad.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x311AD	12297 bytes

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