MALICIOUS
240
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The RTF document contains multiple OLE object embeddings 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 malicious file. The presence of a "Please click Enable Editing to view the document." lure further supports a malicious intent.
Heuristics 7
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Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE_2017_8570RTF \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.
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Composite Moniker in RTF OLE object high RTF_COMPOSITE_MONIKER_RELATEDRTF 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.
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Automatically linked OLE object high RTF_OBJAUTLINKRTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
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\objupdate forces OLE activation high RTF_OBJUPDATERTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
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OLE object data medium RTF_OBJDATARTF contains 4 \objdata section(s) — embedded OLE objects
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Embedded OLE object medium RTF_OBJEMBRTF contains \objemb — embedded OLE object
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Macro/content-enable lure medium SE_ENABLE_LUREDocument 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.bine7e69ec6a7af2ab5aee8a27036c18e6cdc0b4e52741b9d1da881828305657f4b |
rtf-objdata-decoded | RTF \objdata at offset 0xBAC | 59599 bytes |
objdata_01_off0000735b.bin265be2e5276ecf094e2f9bdf563fe9ba159ba0ee3d0732571f375dfb5d858a0f |
rtf-objdata-decoded | RTF \objdata at offset 0x735B | 59572 bytes |
objdata_02_off00025802.bina8e170497da15decc11753d202c99c86f7a7ffd2d52481e6b9c79a5403675379 |
rtf-objdata-decoded | RTF \objdata at offset 0x25802 | 2632 bytes |
objdata_03_off00026da5.bine8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7 |
rtf-objdata-decoded | RTF \objdata at offset 0x26DA5 | 12297 bytes |
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