RTF malware analysis — malicious · c8c027d89dffe9c3

MALICIOUS

RTF

662.3 KB

MD5: 1f5d7335c8fb08f1685c0a03bef319c7 SHA-1: c437b8bd154196fbb466b3380010c00931888df3 SHA-256: c8c027d89dffe9c38eeca218fe9400bb6a28970c22dce6f7b05ceb72bf5d221d

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious OLE object embedding, specifically related to CVE-2017-8570 which is known to drop SCT scripts. The document body instructs the user to 'Enable Editing', a common lure to bypass security measures. The embedded OLE object data likely contains the mechanism for executing a secondary payload, potentially via an SCT script, which is then executed by the system.

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` `3d3e27ba043f3715d2ea8adbfc86f0d412197589d4256b461e1064736fdfd0f1`	rtf-objdata-decoded	RTF \objdata at offset 0x965	221081 bytes
`objdata_01_off00007114.bin` `66c1d8d4c7d461350b225c4b48c1acac7d8bdd84d2824398a58f3af8c394ac2e`	rtf-objdata-decoded	RTF \objdata at offset 0x7114	221054 bytes
`objdata_02_off000775c5.bin` `51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645`	rtf-objdata-decoded	RTF \objdata at offset 0x775C5	2632 bytes
`objdata_03_off00078b68.bin` `e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7`	rtf-objdata-decoded	RTF \objdata at offset 0x78B68	12297 bytes

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