RTF malware analysis — malicious · 82fb252522cdae2a

MALICIOUS

RTF

359.6 KB

MD5: 3aede3db7e654977cb5d5cd06868c7d3 SHA-1: 5695c9d7656bf8467c5abc3963200c5664c7c245 SHA-256: 82fb252522cdae2a54e364c18a455aa74487f21b0b7f8292266d82fab7586083

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains multiple heuristics indicating the presence of embedded OLE objects and a Composite Moniker, specifically related to CVE-2017-8570, which is known to drop SCT scripts. The document body contains a lure instructing the user to 'Enable Editing' to view the content, a common tactic for bypassing macro security. The embedded OLE object is likely responsible for executing the payload.

Heuristics 7

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.
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_off00000965.bin` `2ff80ab47bdaf1f99c44c92ac8d009de609f1af2a59161bfc7f0858ea6da4c68`	rtf-objdata-decoded	RTF \objdata at offset 0x965	72049 bytes
`objdata_01_off00007114.bin` `31a1eebcd5a3c4911159287f9dd27de5c7714f8c2797fb82175af510279cc17a`	rtf-objdata-decoded	RTF \objdata at offset 0x7114	72022 bytes
`objdata_02_off0002bae3.bin` `1168a119c26543fbaa6e9ad1f2c0221f803fb28859c4a42b2857ff6b316de929`	rtf-objdata-decoded	RTF \objdata at offset 0x2BAE3	2632 bytes
`objdata_03_off0002d086.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x2D086	12297 bytes

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