RTF malware analysis — malicious · cb6cf669974a2c05

MALICIOUS

RTF

232.9 KB First seen: 2022-06-16

MD5: 2982ca42d25a53dae547e53e1b20f90c SHA-1: 6a839fc5c905592e5c34e72aa201406764650e5d SHA-256: cb6cf669974a2c057c7bc58e1d7fb00a3e6bace8dbb336bcdd565f7cf3d60f63

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.002 Component Object Model Hijacking T1059.005 Visual Basic

The RTF file contains embedded OLE objects, with critical heuristics indicating the use of a Composite Moniker related to CVE-2017-8570, which is known to drop SCT scripts. The document body explicitly instructs the user to 'download the document and click Enable Editing', a common lure to bypass security measures. The embedded artifacts, particularly objdata_01_off0000c5c3.bin, are associated with the CVE-2017-8570 exploit, suggesting the file's purpose is to execute a malicious script upon user interaction.

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_off0000095d.bin` `77e52ba587a35777bd2b6ed42b115a8d3fb45f9535e9fb5e9a7f1cab81f11da7`	rtf-objdata-decoded	RTF \objdata at offset 0x95D	23112 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000c5c3.bin` `acfe22ea9e4ff240389575cbfc30c4442fd35fc5f8c4bda2b30eb5c2cf4c1cf0`	rtf-objdata-decoded	RTF \objdata at offset 0xC5C3	2632 bytes
`objdata_02_off0000db66.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xDB66	12297 bytes

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