RTF malware analysis — malicious · 851da0f7eaddea4f

MALICIOUS

RTF

662.9 KB

MD5: adec337416d90835607a1bbbe644b8b4 SHA-1: bb8f179855a0b6bee75a8c8e6f4e328a8de7b88a SHA-256: 851da0f7eaddea4f83fb87b4888f097d7b028ac5cb25489ff77e0ef0c0d9197a

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple indicators of OLE object embedding and specifically fires critical heuristics for CVE-2017-8570, which is known to drop SCT scripts. The document body also contains a lure instructing the user to 'Enable Editing', a common tactic to bypass macro security. The exploitation of CVE-2017-8570 is the primary mechanism for executing malicious code, likely a second-stage 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` `d519eda0e49feaa9ef47d61959fde4b8ac3c487a0c0a6251926c2d04c6484a9f`	rtf-objdata-decoded	RTF \objdata at offset 0xBAC	221085 bytes
`objdata_01_off0000735b.bin` `eaa0d7d762635a047c586097ca35597b1fc3655b296abc79f921a050cd7a7fc8`	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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