RTF malware analysis — malicious · 4754ea5a118e6e48

MALICIOUS

RTF

549.5 KB First seen: 2019-08-04

MD5: 85caa764d9a75ecc8442d5ad1ba90737 SHA-1: 45b965ba76cf133e3399453f87359fadc5c53d15 SHA-256: 4754ea5a118e6e482a867c6289e594e8e07377c83e0399335fcd4ab90d8ced7c

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	267816 bytes
SHA-256: `613470e9d263beac7e4d5475f10916e683cc948db713cd5378cb5d79d7b1445a`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.92, consistent with packed or encrypted content.
`objdata_02_off0008693c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8693C	1068 bytes
SHA-256: `2b28d78ceb2a564ae30f2b6865926b068f3f920a373c2e3fc4cb865091eddd89`
`objdata_03_off000871c7.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x871C7	612 bytes
SHA-256: `c62851521e10316dfd43f2b6ee67cc27e2a24456bb346c8fa9dc4a6d6e21d526`
`objdata_04_off000876c1.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x876C1	369 bytes
SHA-256: `3c0b4878e98d51d984a06b9ba36e54869ecd67e41f335730fced4ca28976d877`
`objdata_05_off000879d7.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x879D7	890 bytes
SHA-256: `21dcdf875b1972c61c0e8c2c2123f9a95c8f29fb4a2cf8bf52511b328881de8e`
`objdata_06_off00088132.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x88132	2633 bytes
SHA-256: `fe11c27d916ab897eb94064e9631d8a29c847a6db39259bef31578da8d19fdf5`

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