MALICIOUS
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, including Composite Moniker and ".objupdate" directives, which are known to be exploited by CVE-2017-8570 to drop and execute script files. The document body explicitly instructs the user to 'Enable Editing', a common lure to bypass macro security and activate the embedded malicious content.
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 3 \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 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00000965.bin2675f5b0341da006f53a22f67cf4d977a631854f110b7a8c21b6337ff7ba18f2 |
rtf-objdata-decoded | RTF \objdata at offset 0x965 | 19844 bytes |
objdata_01_off0000ab42.bin18cff8ef194415d33763880bf64011d23305e4b9143b76244b89e1c53b70a0d5 |
rtf-objdata-decoded | RTF \objdata at offset 0xAB42 | 2632 bytes |
objdata_02_off0000c0e5.bin44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037 |
rtf-objdata-decoded | RTF \objdata at offset 0xC0E5 | 12297 bytes |
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