RTF malware analysis — malicious · 649349a7024fc9a2

MALICIOUS

RTF

662.4 KB

MD5: 9b671374dd10b3d12e87f1f909819a60 SHA-1: ae3b49345b9e081ec073e985542f8a9bf7c4419c SHA-256: 649349a7024fc9a257a6a2a882e7018d25c917d9c65100c9494a1cb0adb6954b

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains multiple indicators of malicious OLE object embedding, specifically related to CVE-2017-8570 which is known to drop SCT scripts. The document body instructs the user to 'Enable Editing', a common lure to bypass macro security. The embedded OLE object data, particularly at offset 0x775FF, is associated with the CVE, suggesting the file is designed to exploit this vulnerability 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` `5146aaa8cad70fde81c7428bf76dc758fe7b4845c50d99e5aa29a3b613c84e95`	rtf-objdata-decoded	RTF \objdata at offset 0x965	221109 bytes
`objdata_01_off00007114.bin` `0dd2e25608646e37504cddd2e0b2c7c46b322409486edb689b78dca68989ab1b`	rtf-objdata-decoded	RTF \objdata at offset 0x7114	221082 bytes
`objdata_02_off000775ff.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0x775FF	2632 bytes
`objdata_03_off00078ba2.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x78BA2	12297 bytes

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