RTF / .DOC malware analysis — malicious · 5d9a2d76cc817adc

MALICIOUS

RTF / .DOC

230.4 KB First seen: 2022-07-14

MD5: 0a4f8b4b36f84ca3f48cbc5d26bd4e56 SHA-1: cbb6287d091c17d98295e679af309ec3aa2af59f SHA-256: 5d9a2d76cc817adc81186c032a2b9dc7e5aa409ca56485e46a9c2ff0c50fd090

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains multiple OLE objects and triggers heuristics related to CVE-2017-8570, which is known to drop SCT scripts. The presence of a 'Please click Enable Editing to view the document' lure further suggests a malicious intent to bypass security controls and execute embedded content. The exact script dropped by CVE-2017-8570 is not directly visible, but the exploit itself is a strong indicator of malicious activity.

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.
\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 3 \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
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000ba3.bin` `19849a7a2744d567e20f5356df2c6c16aba0a62713d788d2b0579bc3442101c5`	rtf-objdata-decoded	RTF \objdata at offset 0xBA3	21577 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000bb91.bin` `0f2cec052fe8f824845b1aa6e0804ad719eb3010400f0023038dbc39515992c2`	rtf-objdata-decoded	RTF \objdata at offset 0xBB91	2632 bytes
`objdata_02_off0000d134.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xD134	12297 bytes

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