RTF malware analysis — malicious · 33a6215e0f0b6059

MALICIOUS

RTF

662.9 KB

MD5: 5d2b346d73b01708b068df7b566d1c92 SHA-1: 79e1af78bc637727b64ae42b210049758942f13b SHA-256: 33a6215e0f0b60598bc8eb89fd2d24e6190b6abe96665dd8470ad62647897c42

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple OLE objects and triggers heuristics 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 macro-based malware. The presence of composite monikers and objdata sections strongly suggests the exploitation of CVE-2017-8570 to execute a script, likely an SCT file, which would then proceed with a malicious 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_off00000bac.bin` `7809cf61f493b14a79450248f01f8ae1922f3d58a604ddfc4f113f8b77ab57d9`	rtf-objdata-decoded	RTF \objdata at offset 0xBAC	221097 bytes
`objdata_01_off0000735b.bin` `0093d95cf21bb8bf044c8cc584acf8aab1d1333169e3323f0bb689e41efba6b7`	rtf-objdata-decoded	RTF \objdata at offset 0x735B	221070 bytes
`objdata_02_off0007782e.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0x7782E	2632 bytes
`objdata_03_off00078dd1.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x78DD1	12297 bytes

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