RTF malware analysis — malicious · f7c61ed67f59282a

MALICIOUS

RTF

662.9 KB

MD5: 3cd00e934d2d5379be6ad0e96221b9d2 SHA-1: bac0c63d18ab6b3d99702be0aeb9d27c0e9f6fca SHA-256: f7c61ed67f59282aa2ba93d573d161fcb2424f07bbb4dbc6fcf562da71423cf7

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 manipulation, specifically related to CVE-2017-8570. The presence of Composite Moniker and ".objupdate" directives strongly suggests the file is designed to exploit this vulnerability to execute a secondary payload, likely a script, upon user interaction. The document body's "Enable Editing" prompt further supports this, indicating a lure to bypass security measures.

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` `1e21926e4e77eaf1eae74ddc4e53b210bd1a6b7781d8322154acf0c95bb2d481`	rtf-objdata-decoded	RTF \objdata at offset 0xBAC	221097 bytes
`objdata_01_off0000735b.bin` `f0cbc0b17af85c1c13930c119fcbf990bfd0bddb787afb5674094ef5a95a0647`	rtf-objdata-decoded	RTF \objdata at offset 0x735B	221070 bytes
`objdata_02_off0007782e.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0x7782E	2632 bytes
`objdata_03_off00078dd1.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x78DD1	12297 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.