RTF malware analysis — malicious · f415487e104efb2d

MALICIOUS

RTF

1.02 MB

MD5: 35c9dcf7c4a922996d01cd1172e5ee72 SHA-1: f04b7261c7209fbca4a6ca7b64d52b24fb0a0bef SHA-256: f415487e104efb2d80000858f7942cd9db73526601066eca5e63d99a50926298

280 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains multiple indicators of malicious activity, including OLE object data, composite monikers, and an explicit lure to enable editing and macros. The presence of CVE-2017-8570 suggests the file is designed to drop a script, likely for further execution. The document body's message about 'Microsoft Office does not work in email Preview' is a common social engineering tactic to prompt users to open and enable content.

Heuristics 8

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1037KB of hex-encoded data inside \objdata sections — may hide a payload
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_off00000966.bin` `589e5f8def34a05688b45b988dc55eb40455bbc098a1f0c00e729ecc391b3e00`	rtf-objdata-decoded	RTF \objdata at offset 0x966	408276 bytes
`objdata_01_off00007115.bin` `ee8413e944a90cb58c12cafa5179dbd04dfa41e96fbc87b8d53dba335a7181b3`	rtf-objdata-decoded	RTF \objdata at offset 0x7115	408249 bytes
`objdata_02_off000d66bc.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0xD66BC	2632 bytes
`objdata_03_off000d7c5f.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0xD7C5F	12297 bytes

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