RTF malware analysis — malicious · a3f8cfdfbecd9731

MALICIOUS

RTF

662.8 KB

MD5: f2b11c6e07382c45fb68e086d65fc582 SHA-1: 498b6ceb473fd399a01a8b19400665cd2b504aec SHA-256: a3f8cfdfbecd9731f57a72183f6e35628a7cfd76dcec27c68cf22ccdf9fc4a8b

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple indicators of OLE object embedding and specifically fires critical heuristics for CVE-2017-8570, which is known to drop SCT scripts. The document body contains a generic lure instructing the user to 'Enable Editing'. The exploitation of this CVE is the primary mechanism for executing further malicious content.

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` `c39929c4f1584ee1e9841fd7df085265fe24acd5009ebb9de1c45f725778f613`	rtf-objdata-decoded	RTF \objdata at offset 0xBAC	221069 bytes
`objdata_01_off0000735b.bin` `41d609aef25b1522bdd3b44617c25153d993a2d0820375fde48de4c4d5cae0f0`	rtf-objdata-decoded	RTF \objdata at offset 0x735B	221042 bytes
`objdata_02_off000777f2.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0x777F2	2632 bytes
`objdata_03_off00078d95.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x78D95	12297 bytes

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