RTF malware analysis — malicious · ef27b66389f9b275

MALICIOUS

RTF

662.9 KB

MD5: d12ba79ee3a479dcca6cb84949917edb SHA-1: 5d3f16aedc7e057d701765d672a7789f6d0453ac SHA-256: ef27b66389f9b2751ba25700dc38016dcc4b8d05ae47ab0500f1d5e709287d5d

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains multiple indicators of malicious activity, including OLE object data and references to CVE-2017-8570, which is known to drop SCT scripts. The document body explicitly prompts the user to 'Enable Editing', a common social engineering tactic to bypass macro security. The presence of composite monikers and objdata sections strongly suggests the exploitation of a vulnerability to execute arbitrary code, likely a script.

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` `5da91e01b7fd2d0d0f66999f7dbb0ce2be5c82fb279a151a8b6b64f58a254a72`	rtf-objdata-decoded	RTF \objdata at offset 0xBAC	221085 bytes
`objdata_01_off0000735b.bin` `d6707cbeb5484bbca226037a1b103fcb316a257750f74c643b8fe106cda69e85`	rtf-objdata-decoded	RTF \objdata at offset 0x735B	221058 bytes
`objdata_02_off00077814.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0x77814	2632 bytes
`objdata_03_off00078db7.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x78DB7	12297 bytes

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