RTF / .DOC malware analysis — malicious · 5e9aa4fa33eaaffb

MALICIOUS

RTF / .DOC

336.0 KB First seen: 2022-09-19

MD5: 10a0035c1788d74ce14d219fab19f17c SHA-1: c01953fba094fc44e7cf897dfa95b8cf294d97f3 SHA-256: 5e9aa4fa33eaaffbc5353b4c9fb2e18879a1e67dfe761437815d10b34fa669af

200 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter

The RTF document contains embedded OLE objects with composite moniker structures, indicating exploitation of CVE-2017-8570. This vulnerability allows the embedded object to drop and execute a script, likely a second-stage payload. The heuristic firings strongly suggest this exploit path, leading to a high confidence assessment despite the lack of explicit script content.

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` `f75f61e20b26ab2b09ddf7dab00121831f51db87bc6b2749906024542af97ad9`	rtf-objdata-decoded	RTF \objdata at offset 0x7D4	74029 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000261ee.bin` `43dc420203828d24ec36adf809a9ada54bc1f182c6dd7bd39e852b7059bf1a1d`	rtf-objdata-decoded	RTF \objdata at offset 0x261EE	2632 bytes
`objdata_02_off00027791.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0x27791	12297 bytes

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