MALICIOUS
442
Risk Score
Malware Insights
MITRE ATT&CK
T1204.002 Malicious File Execution: User Execution: Malicious File
T1566.001 Phishing: Spearphishing Attachment
The RTF document contains embedded OLE objects and exploits CVE-2017-11882, indicated by multiple critical heuristic firings. The embedded object, when decoded, contains a PE header and is detected by ClamAV as Rtf.Dropper.Agent-9965975-1. Further analysis of extracted artifacts reveals a payload identified as Win.Dropper.LokiBot-10023558-0, suggesting the primary function is to download and execute a secondary stage malware. The presence of the Equation Editor ProgID and composite moniker further supports the exploitation of CVE-2017-11882.
Heuristics 11
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Equation Editor activation — CVE-2017-11882 related high CVE_2017_11882_ACTIVATION_RELATEDRTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
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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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Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITORRTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
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PE header (with DOS stub) in hex data critical RTF_MZ_HEXHex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
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ClamAV: Rtf.Dropper.Agent-9965975-1 critical CLAMAV_DETECTIONClamAV detected this file as malware: Rtf.Dropper.Agent-9965975-1
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ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAVClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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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 ~1969KB of hex-encoded data inside \objdata sections — may hide a payload
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OLE object data medium RTF_OBJDATARTF contains 2 \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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Suspicious extracted artifact info 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.
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00001347.binfaa5bdaeacb4ccb6691ea851b5c773f2c0416135805f5a2417ac88b5447872d2 |
rtf-objdata-decoded | RTF \objdata at offset 0x1347 | 984783 bytes |
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Detection
ClamAV:
Win.Dropper.LokiBot-10023558-0
Obfuscation or payload:
likely
Carved artifact entropy is 7.79, consistent with packed or encrypted content.
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objdata_01_off001e34ec.bindb65fbb096ae324e366d05144935ad4d6afaef3ea4d6ec1ba027c905cb7f65b5 |
rtf-objdata-decoded | RTF \objdata at offset 0x1E34EC | 461165 bytes |
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