RTF malware analysis — malicious · 605e84b01e008da4

MALICIOUS

RTF

357.4 KB

MD5: 1c60a1e972aaa5a3eb15c0adc2de7ead SHA-1: 921fed27f6b23f7f810ee03eeefb91634a295592 SHA-256: 605e84b01e008da482a744feb468d9dd842148850fda1694a6772b6e38cc6c82

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of OLE object manipulation, specifically related to CVE-2017-8570, which is known to drop SCT scripts. The document body explicitly instructs the user to 'click Enable Editing when opening' to bypass security warnings, a common lure for malicious documents. This suggests the file is designed to exploit the user's trust to execute a secondary payload.

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` `804b8823746c306a95e96b056071ece65b7e2ec99e46ae74024654e98fe35a13`	rtf-objdata-decoded	RTF \objdata at offset 0x965	70989 bytes
`objdata_01_off00007114.bin` `375458d336fa3b201643f6a309df29792bc7d2473ae7e45144efdd2d23f02998`	rtf-objdata-decoded	RTF \objdata at offset 0x7114	70962 bytes
`objdata_02_off0002b245.bin` `1168a119c26543fbaa6e9ad1f2c0221f803fb28859c4a42b2857ff6b316de929`	rtf-objdata-decoded	RTF \objdata at offset 0x2B245	2632 bytes
`objdata_03_off0002c7e8.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x2C7E8	12297 bytes

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