MALICIOUS
340
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The RTF file contains multiple indicators of OLE object manipulation, specifically leveraging CVE-2017-8570 and CVE-2017-0199/CVE-2017-8759. These vulnerabilities allow the embedded OLE object to automatically execute a remote loader, which likely downloads and executes a secondary payload. The document body contains a lure to 'Enable Editing', further supporting the malicious intent.
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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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
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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
🗂 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_off00000bac.bin |
rtf-objdata-decoded | RTF \objdata at offset 0xBAC | 221085 bytes |
SHA-256: d519eda0e49feaa9ef47d61959fde4b8ac3c487a0c0a6251926c2d04c6484a9f |
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objdata_01_off0000735b.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x735B | 221058 bytes |
SHA-256: eaa0d7d762635a047c586097ca35597b1fc3655b296abc79f921a050cd7a7fc8 |
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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_off00077814.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x77814 | 2632 bytes |
SHA-256: 51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645 |
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objdata_03_off00078db7.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x78DB7 | 12297 bytes |
SHA-256: e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7 |
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