RTF / .DOC malware analysis — malicious · 5fced32698fed863

MALICIOUS

RTF / .DOC

375.3 KB

MD5: 12511eb8de691cd26cca383ce13d51b8 SHA-1: 0c30a75d025a54466b4245cb5c3fa0b5d69a6254 SHA-256: 5fced32698fed86395a2785fa5b0e92856b1a658b8dd2344ff995f205af25434

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains multiple indicators of OLE object manipulation, specifically related to CVE-2017-8570, which is known to drop SCT scripts. The document body explicitly instructs the user to 'Enable Editing' and implies that Microsoft Office does not work in preview, a common lure to bypass security measures. The presence of OLE object data and composite monikers strongly suggests the embedded object is designed to execute code, likely by exploiting CVE-2017-8570 to download and run a secondary 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` `1cf596ae7d378546aa2f6f3f166d052eb6bd4dda20246bad3e0c78da951921b7`	rtf-objdata-decoded	RTF \objdata at offset 0x965	79784 bytes
`objdata_01_off00007114.bin` `bfa68b9af6d4a099473ccee405949b1e4d03cdaa3ce99ea93b42c5c83002f841`	rtf-objdata-decoded	RTF \objdata at offset 0x7114	79757 bytes
`objdata_02_off0002f9bb.bin` `a8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379`	rtf-objdata-decoded	RTF \objdata at offset 0x2F9BB	2632 bytes
`objdata_03_off00030f5e.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x30F5E	12297 bytes

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