RTF malware analysis — malicious · 6c108fbadf2dd337

MALICIOUS

RTF

549.5 KB First seen: 2019-04-18

MD5: 754c9318993ba50cb402329aaad011d2 SHA-1: ad48548a8c49ca53ea55615fc734dfd334348572 SHA-256: 6c108fbadf2dd337466a2847bd9af814a0cc99dd70cee3b12b5025a809d1c1ff

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects and ".objupdate" directives, indicating it is designed to exploit vulnerabilities. Specifically, the "CVE_2017_8570" heuristic firing confirms the use of a Composite Moniker to drop an SCT script, which is a known technique for executing arbitrary code. The embedded OLE object data, particularly at offset 0xB5D2, is the likely source of this exploit.

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 7 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Suspicious extracted artifact info 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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000025.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x25	205 bytes
SHA-256: `75a725fc96463ea024899f12597b26031b1a5d84ddd2de407d47914073b3db59`
`objdata_01_off000001ea.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1EA	267822 bytes
SHA-256: `39c5793d22d4e3a6d38e2cad99cd88b79ced0af7d5c4e558dc066d92af2338f0`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.92, consistent with packed or encrypted content.
`objdata_02_off00086948.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x86948	1068 bytes
SHA-256: `2b28d78ceb2a564ae30f2b6865926b068f3f920a373c2e3fc4cb865091eddd89`
`objdata_03_off000871d3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x871D3	612 bytes
SHA-256: `c62851521e10316dfd43f2b6ee67cc27e2a24456bb346c8fa9dc4a6d6e21d526`
`objdata_04_off000876cd.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x876CD	369 bytes
SHA-256: `3c0b4878e98d51d984a06b9ba36e54869ecd67e41f335730fced4ca28976d877`
`objdata_05_off000879e3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x879E3	890 bytes
SHA-256: `21dcdf875b1972c61c0e8c2c2123f9a95c8f29fb4a2cf8bf52511b328881de8e`
`objdata_06_off0008813e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8813E	2633 bytes
SHA-256: `fe11c27d916ab897eb94064e9631d8a29c847a6db39259bef31578da8d19fdf5`

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