RTF malware analysis — malicious · cbba789a9c4985b3

MALICIOUS

RTF

375.9 KB

MD5: 8166fad57ff3520476075cce2c32811d SHA-1: 71a5b1e4459310540ceca8b73706ce576bfb23fc SHA-256: cbba789a9c4985b357766469f35756ce8e17f9c00c76ab58f4b98dde47ce220d

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 composite monikers and CVE-2017-8570. This indicates the file is designed to exploit this vulnerability, which is known to drop and execute script files. The document body contains a generic 'Enable Editing' lure, further supporting the malicious intent.

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` `e63166510259e616c5d47b2ff337dd7974543f063ad6292f0a0a6f4f5e2a2b2c`	rtf-objdata-decoded	RTF \objdata at offset 0xBAC	79780 bytes
`objdata_01_off0000735b.bin` `a11e7ac0efd02d6f954271c91054a037ef84e951421ee0583718df461a8af477`	rtf-objdata-decoded	RTF \objdata at offset 0x735B	79753 bytes
`objdata_02_off0002fbfa.bin` `a8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379`	rtf-objdata-decoded	RTF \objdata at offset 0x2FBFA	2632 bytes
`objdata_03_off0003119d.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x3119D	12297 bytes

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