RTF malware analysis — malicious · 76de0fbc2eba0e6f

MALICIOUS

RTF

662.9 KB

MD5: c801b26fae70ab85b1d374f04e491135 SHA-1: bedcd40f219f8d57d45d0b066502ed55a6614047 SHA-256: 76de0fbc2eba0e6f5e2ac97f0626106dc68a8162eeb7a75c7f178714762be0e7

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects and specifically triggers the CVE-2017-8570 vulnerability via a composite moniker. This exploit is known to drop and execute a script, which is the likely primary function of this file. The document body contains a generic 'Enable Editing' lure, further supporting the malicious intent.

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` `579dbb489d0ecf041580f0ceaf4d922a8ec4c1eaec4479a1e2f4bba2f9cf10ed`	rtf-objdata-decoded	RTF \objdata at offset 0xBAC	221101 bytes
`objdata_01_off0000735b.bin` `fe145acd831ec24accb4c9e4c973d259c807728243f417ff211033f1d4109991`	rtf-objdata-decoded	RTF \objdata at offset 0x735B	221074 bytes
`objdata_02_off00077836.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0x77836	2632 bytes
`objdata_03_off00078dd9.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x78DD9	12297 bytes

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