RTF / .DOC malware analysis — malicious · c4155eb3caee31ef

MALICIOUS

RTF / .DOC

230.4 KB First seen: 2022-07-15

MD5: ccb4d123d7d23778dc3b804f8b4c551a SHA-1: 6abaeacc98255a7a8048f0a62a7b983720c904da SHA-256: c4155eb3caee31efbcf7672f25c39e875b81bba26400cf0c4d4840e534491122

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

The RTF document contains embedded OLE objects and triggers a Composite Moniker, indicating exploitation of CVE-2017-8570. The document body prompts the user to 'Enable Editing', a common lure to bypass macro security and execute embedded malicious content. The embedded artifact objdata_00_off00000ba3.bin is flagged as a suspicious extracted artifact.

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_off00000ba3.bin` `09a4b4d498bd75a834f26aef7cc872727da5145c2890c4774d4990c44fced78f`	rtf-objdata-decoded	RTF \objdata at offset 0xBA3	21569 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000bb81.bin` `0f2cec052fe8f824845b1aa6e0804ad719eb3010400f0023038dbc39515992c2`	rtf-objdata-decoded	RTF \objdata at offset 0xBB81	2632 bytes
`objdata_02_off0000d124.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xD124	12297 bytes

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