RTF / .DOC malware analysis — malicious · 0b3c39749cfe5ab0

MALICIOUS

RTF / .DOC

255.3 KB First seen: 2023-01-24

MD5: 1b6b5c697c2ac15096e3dfb7464f943e SHA-1: 87ea453be2003b5ac637dc31d9977e79f32a8670 SHA-256: 0b3c39749cfe5ab0b2a59a9648da53502418d34a6a086443f60ecb474caadf1c

200 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 T1566.002 Phishing: Spearphishing Link

The RTF file contains embedded OLE objects and triggers ".objupdate" and composite moniker-related heuristics, indicating exploitation of CVE-2017-8570. This vulnerability allows the file to drop and execute a script, likely a second-stage payload. The extracted embedded artifacts are suspicious and warrant further investigation.

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` `39fb0592bd904934ef0877a625c8372af444c62d46660e20bb02600ab77c3918`	rtf-objdata-decoded	RTF \objdata at offset 0x7D4	34279 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00011ef6.bin` `24fedef2d4fe5e3d6666fae2543850c54134511ad6be8583d5aa0438ef699c5d`	rtf-objdata-decoded	RTF \objdata at offset 0x11EF6	2632 bytes
`objdata_02_off00013499.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0x13499	12297 bytes

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