RTF malware analysis — malicious · 5f815bd7f39cccb4

MALICIOUS

RTF

1.02 MB

MD5: 3347d22680185efb3cd73d55b55a5c6d SHA-1: 36f0afde99cdabe38dbe7c281b61c17b1ca41372 SHA-256: 5f815bd7f39cccb4b92bea3d36861d6844eeea3307e86b237d794c660d1305c3

280 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, which is associated with CVE-2017-8570. The document body explicitly instructs the user to 'click Enable Editing' to bypass preview limitations, a common lure to execute embedded content. The presence of large hex-encoded data within OLE objects suggests a hidden payload, likely a script or executable, intended to be dropped and run.

Heuristics 8

Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570

RTF \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.
Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF 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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1037KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 4 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000966.bin` `1f4faf36953f4b3e2353d0e7e7e9ba7a839e824fd994e2e0df2d812e61a073cd`	rtf-objdata-decoded	RTF \objdata at offset 0x966	408268 bytes
`objdata_01_off00007115.bin` `921d12f6a43619ab4714d67623c2f9b173877a28f3795ebb6dfd928a498ea4da`	rtf-objdata-decoded	RTF \objdata at offset 0x7115	408241 bytes
`objdata_02_off000d66aa.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0xD66AA	2632 bytes
`objdata_03_off000d7c4d.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0xD7C4D	12297 bytes

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