RTF / .DOC malware analysis — malicious · 51d5ef24a607309a

MALICIOUS

RTF / .DOC

234.7 KB First seen: 2022-07-11

MD5: 036344eebbb5a5f70069c7ced82f4c34 SHA-1: 8dcd9d299a8fa4ed389eaa4f4fabe3086c83a247 SHA-256: 51d5ef24a607309aaa9015dc07f7feb587d4957f901c459dab086ee9a860b252

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File Execution T1204.002 Malicious File Execution: Malicious File T1059 Command and Scripting Interpreter T1059.003 Command and Scripting Interpreter: Windows Command Shell

The RTF document contains OLE object data that exploits CVE-2017-8570. This vulnerability allows for the dropping and execution of a script, indicated by the 'CVE_2017_8570' and 'RTF_OBJUPDATE' heuristics. The embedded OLE object is likely a second-stage payload designed to further compromise the system.

Heuristics 6

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
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_off000007d2.bin` `ab7cb83fc24aab3d73fd22cdace5feb77942929db7bbc1a48f5ef2f60f731220`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	24147 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000cca2.bin` `81ac98515bd4de25fc9f4148c41d6c0b489643c09de1fbb1e6bb969a785f1b01`	rtf-objdata-decoded	RTF \objdata at offset 0xCCA2	2632 bytes
`objdata_02_off0000e245.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xE245	12297 bytes

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