RTF malware analysis — malicious · f50e0cb0a3ea1ee4

MALICIOUS

RTF

369.0 KB

MD5: bbf819de6c9330f25be537996b5fc2d3 SHA-1: 593968326a3b1d3ccd209c9983ede8d800e2cac4 SHA-256: f50e0cb0a3ea1ee41d812809b39b71470544dd0d366e8171d5a507e414d6a7df

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 manipulation, 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 security measures and execute embedded malicious content. The presence of OLE object data and automatic linking further supports the exploitation of vulnerabilities for client execution.

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` `198c1ad2b9c7b63916b6cfac2ca10f4cd27dae2a38cd2cb57c3d38eb9c07c3b1`	rtf-objdata-decoded	RTF \objdata at offset 0xBAC	76392 bytes
`objdata_01_off0000735b.bin` `a4c078dad98c09540a7fc1912e15031581782e3343f33aa1f99931abcb965352`	rtf-objdata-decoded	RTF \objdata at offset 0x735B	76365 bytes
`objdata_02_off0002e072.bin` `a8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379`	rtf-objdata-decoded	RTF \objdata at offset 0x2E072	2632 bytes
`objdata_03_off0002f615.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x2F615	12297 bytes

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