RTF malware analysis — malicious · cd0dd0065cc53b90

MALICIOUS

RTF

368.4 KB

MD5: ee38357264220bc1d074c24dcac87e9c SHA-1: 67d1531223b5b977a07358e65de9178b195cda80 SHA-256: cd0dd0065cc53b9013fc6938e5d7b096d59c0aeb878d6d619a43e96f291fbc53

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of OLE object manipulation, specifically related to CVE-2017-8570, which is known to drop SCT scripts. The document body contains a lure instructing the user to enable editing, a common tactic for macro-based malware. While no scripts were directly extracted, the heuristics strongly suggest the exploitation of CVE-2017-8570 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` `d02ef2f06486cdf608d92498144f2e36fb5c6b35bb409cba9c7f9f7b34f1a275`	rtf-objdata-decoded	RTF \objdata at offset 0x965	76404 bytes
`objdata_01_off00007114.bin` `28750f87d923d49ed34401a1f207747487e19cb59e3f3e052ee96665d4e654df`	rtf-objdata-decoded	RTF \objdata at offset 0x7114	76377 bytes
`objdata_02_off0002de45.bin` `a8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379`	rtf-objdata-decoded	RTF \objdata at offset 0x2DE45	2632 bytes
`objdata_03_off0002f3e8.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x2F3E8	12297 bytes

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