MALICIOUS
320
Risk Score
Malware Insights
MITRE ATT&CK
T1204.002 Malicious File
T1566.001 Spearphishing Attachment
The RTF document contains multiple OLE object-related heuristics, including automatic linking and updates, indicating an attempt to exploit OLE vulnerabilities. The presence of ` ` and ` ` characters in the DOC BODY suggests potential obfuscation or malformed text, but the core content appears to be a formal letter related to personnel and insurance for a bank. The high-confidence heuristics strongly suggest that the embedded OLE objects are designed to be activated automatically upon opening the document, likely to download and execute a secondary payload.
Heuristics 8
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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
🗂 Part of campaign:
shared payload 3cd3b7d42e
51 samples
Extracted artifacts 4
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off000037fa.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x37FA | 38988 bytes |
SHA-256: 4f0af12874e2c4a71af970e4cdd6958bbbe8d4305599bf21a962f038f110842a |
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objdata_01_off00009fa9.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x9FA9 | 38961 bytes |
SHA-256: b57e59f0be386a07c68f96d133d6499980a40956416ebc8366c57aa203e1286d |
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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_off0001dcd8.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x1DCD8 | 2632 bytes |
SHA-256: 3cd3b7d42e5855c90d6d11c54ef2670ed8970441480cc23f7d39ef08fa1c935b |
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objdata_03_off0001f27b.bin |
rtf-objdata-decoded | RTF \objdata at offset 0x1F27B | 12297 bytes |
SHA-256: e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7 |
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