RTF malware analysis — malicious · 97bb73a7c678dc8c

MALICIOUS

RTF

257.2 KB First seen: 2023-02-07

MD5: d8c168266888261dc783a5b141c4b1fb SHA-1: c5d6a9a6bca2cb6c9db40c62c6f2ec302b916c13 SHA-256: 97bb73a7c678dc8cf65ad807b2915efdd8f16d7cffe5520511425bb1c42ecbfb

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains OLE object data and triggers CVE-2017-8570, indicating it is designed to drop and execute a script. The embedded objdata sections likely contain the malicious payload. The attack pattern is consistent with exploiting vulnerabilities in document handling to achieve arbitrary code execution.

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_off000007d4.bin` `6a9a24d7579ab0e5ad66f18f2672bfba5f56ab46ef8193848c02339c6c6a1a0d`	rtf-objdata-decoded	RTF \objdata at offset 0x7D4	35192 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00012660.bin` `24fedef2d4fe5e3d6666fae2543850c54134511ad6be8583d5aa0438ef699c5d`	rtf-objdata-decoded	RTF \objdata at offset 0x12660	2632 bytes
`objdata_02_off00013c03.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0x13C03	12297 bytes

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