RTF malware analysis — malicious · 15dbf250a6fea8e7

MALICIOUS

RTF

217.6 KB First seen: 2022-04-29

MD5: 5bf815b4ed7ea7adeb1f0356e4fa9015 SHA-1: 94fdae9a3707cea93f3a445421a452f9e3d4daf2 SHA-256: 15dbf250a6fea8e71feb620431690fe74a105fa2e69c6d1f067ec6150671d643

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains OLE object data and triggers heuristics related to CVE-2017-8570, indicating it exploits a vulnerability to execute code. The composite moniker suggests the file is designed to drop and execute a script, likely as part of a spearphishing attachment attack. No specific family could be identified.

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` `a8da30e51d6fd6e6ed225f0183180b8f2f81cd52cc87b0ab4c3c78ff65326282`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	15743 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000885a.bin` `69f64299837b9bdce8c52fe4f05181569f28511801c1b3d711966300926e8171`	rtf-objdata-decoded	RTF \objdata at offset 0x885A	2632 bytes
`objdata_02_off00009dfd.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9DFD	12297 bytes

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