MALICIOUS
360
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
The RTF document contains multiple indicators of exploitation for CVE-2017-8570 and CVE-2017-0199, leveraging OLE objects and composite monikers. These vulnerabilities are known to facilitate the automatic download and execution of arbitrary code, likely a second-stage payload. The presence of embedded OLE objects and excessive hex data further supports this attack pattern.
Heuristics 9
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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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CVE-2017-0199 / CVE-2017-8759 (OLE2Link auto-activated remote loader) critical RTF_OLE2LINK_REMOTE_MONIKER_LOADERRTF embeds an OLE2Link object that is force-activated with \objupdate (no user interaction on open) and fetches a remote second stage — through an INCLUDETEXT/INCLUDEPICTURE field or the OLE object's own moniker. This is the OLE2Link auto-update attack path shared by CVE-2017-0199 (server returns an HTA/scriptlet) and CVE-2017-8759 (server returns a SOAP WSDL the .NET parser compiles). Office processes the fetched response through the same code path; the specific CVE depends on the now-unreachable server content type.
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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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Large hex data blocks in OLE object high RTF_EXCESSIVE_HEXRTF contains ~1727KB of hex-encoded data inside \objdata sections — may hide a payload
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Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGEOne or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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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
🗂 Part of campaign:
shared payload 51ef705eef
49 samples
Extracted artifacts 4
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off000d70ef.bin |
rtf-objdata-decoded | RTF \objdata at offset 0xD70EF | 408264 bytes |
SHA-256: 2e17a7d62cc4a73f1a8b38892c7cadeee9942138929866331088543b6817fab5 |
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objdata_01_off000dd89e.bin |
rtf-objdata-decoded | RTF \objdata at offset 0xDD89E | 408237 bytes |
SHA-256: 04591b21d24e8d0b5242686e1d2cdba47cbc3951371a54619814b7f9fb0c89ea |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Static shellcode analysis recovered command string(s): WScript.Shell"")")
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objdata_02_off001ace2b.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x1ACE2B | 2632 bytes |
SHA-256: 51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645 |
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objdata_03_off001ae3ce.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x1AE3CE | 12297 bytes |
SHA-256: e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7 |
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