RTF / .DOC malware analysis — malicious · b8d128f7c4e81931

MALICIOUS

RTF / .DOC

229.8 KB First seen: 2022-07-14

MD5: 029e40fc20bf22c0bfa0bf867aa681af SHA-1: da4e65647e8d49db75486778406470ed00615a10 SHA-256: b8d128f7c4e8193197ed0ba6f8289f0dcbc8af849dc7cee06122925f357edb13

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The sample is an RTF document that leverages CVE-2017-8570, a composite moniker vulnerability, to drop and execute a script. The document body contains a lure instructing the user to 'download the document and click Enable Editing', a common tactic to bypass macro security. The embedded OLE object data and heuristics strongly indicate the execution of a secondary payload, likely a script, facilitated by the vulnerability.

Heuristics 7

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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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_off0000095c.bin` `7a495f41087f3bf7d60e2cbeea0d77a70239048fb67cce54f9ac56bc440050fe`	rtf-objdata-decoded	RTF \objdata at offset 0x95C	21577 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000b94a.bin` `0f2cec052fe8f824845b1aa6e0804ad719eb3010400f0023038dbc39515992c2`	rtf-objdata-decoded	RTF \objdata at offset 0xB94A	2632 bytes
`objdata_02_off0000ceed.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xCEED	12297 bytes

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