RTF malware analysis — malicious · aa45314cfd1062ef

MALICIOUS

RTF

375.3 KB

MD5: 497f9f60d1d13c19163a63cd9f160cbf SHA-1: 2e4ca56104e24acf09ad4a2449cb3bb36f088590 SHA-256: aa45314cfd1062ef6f5bbed8ff8fa0dede6ae51408c43ca86bc4acf2fca2d4c6

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious OLE object embedding and automatic linking, specifically related to CVE-2017-8570. The document body instructs the user to 'click Enable Editing', a common lure to bypass macro security. The presence of composite monikers and objdata sections strongly suggests the embedded OLE object is designed to execute a secondary payload, likely a script.

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` `4586fd2d061d99d8216be8fa7fbecd33ac2dad17a9226680baf0378016c173de`	rtf-objdata-decoded	RTF \objdata at offset 0x965	79796 bytes
`objdata_01_off00007114.bin` `5e20dd98e07c1edbc5f79eea4607d67bb54a55d76fc19c5a71f54cde1cda26d2`	rtf-objdata-decoded	RTF \objdata at offset 0x7114	79769 bytes
`objdata_02_off0002f9d5.bin` `a8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379`	rtf-objdata-decoded	RTF \objdata at offset 0x2F9D5	2632 bytes
`objdata_03_off00030f78.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x30F78	12297 bytes

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