RTF malware analysis — malicious · 9befb37da9ae081e

MALICIOUS

RTF

662.3 KB

MD5: 25db453f03731de974afc9f4cac5679b SHA-1: 0aeb77965e30d191ffeb7602d163a1fa988b5268 SHA-256: 9befb37da9ae081e0d19b005eb3648cc12e751bb565a3cb79adda15e202cc3be

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 a script. The document body contains a lure instructing the user to enable editing, a common tactic for macro-based malware. The presence of composite monikers and OLE object data strongly suggests the exploitation of CVE-2017-8570 to execute a 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` `c9aa2c41512e8dd14544e483bc4b178901e8c8971ea8244f333f5f94deb91b59`	rtf-objdata-decoded	RTF \objdata at offset 0x965	221077 bytes
`objdata_01_off00007114.bin` `2922fd3d6734224c75178d7fe7127dcc25bb51c7f4bc769f0ce32519e4e1a2d0`	rtf-objdata-decoded	RTF \objdata at offset 0x7114	221050 bytes
`objdata_02_off000775bd.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0x775BD	2632 bytes
`objdata_03_off00078b60.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x78B60	12297 bytes

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