RTF / .DOC malware analysis — malicious · 5f86f321ec714d97

MALICIOUS

RTF / .DOC

241.3 KB First seen: 2023-03-25

MD5: b2e33303938d9a36cb52d3e10a7cf6ff SHA-1: b2ae72e1d379cb75f8c67f85b390934ecffffe20 SHA-256: 5f86f321ec714d973542a7eed90eae5973fa9d065faf40f56f53263ae3a5cfa1

180 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The RTF document contains embedded OLE objects with composite monikers, indicative of the CVE-2017-8570 vulnerability. This vulnerability allows the document to drop and execute a script, likely a second-stage payload. The presence of multiple OLE object data sections and the use of ".objupdate" further support this attack vector.

Heuristics 5

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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000007d4.bin` `d3720e63085df586489d8883b324adf604dea01b0f8a88580fe57fd39a98e2c4`	rtf-objdata-decoded	RTF \objdata at offset 0x7D4	27403 bytes
`objdata_01_off0000e718.bin` `a6611d501e579ac96404a9c19f7f70ee1bd26c5f4967cc103af51e1fde90fca8`	rtf-objdata-decoded	RTF \objdata at offset 0xE718	2632 bytes
`objdata_02_off0000fcbb.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xFCBB	12297 bytes

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