RTF malware analysis — malicious · 6521461aecfafe43

MALICIOUS

RTF

565.5 KB First seen: 2019-05-10

MD5: 99d3f8a915f81600170d8df28f0b2038 SHA-1: 906884863604167e33632f71e5c6f885403f72ae SHA-256: 6521461aecfafe43bb00140b106b6e2dc52d2e4fb6b784aa5118f8aa3a907e90

184 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious OLE object embedding and specifically fires critical heuristics for CVE-2017-8570, which is known to drop SCT scripts. The embedded OLE object data, particularly objdata_01_off000001ee.bin, likely contains the malicious script payload. The exploit facilitates client execution by leveraging a known 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 9 \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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://nsis.sf.net/NSIS_Error In RTF body

Extracted artifacts 8

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: `980870ba17beb12f03c3941a0cfa655d820816cec9104090156a6ea6ece5ce8a`
`objdata_01_off000001ee.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1EE	273375 bytes
SHA-256: `b8de3b379260d650dd5dd114261df848582f16649e7f7f5e91b7304d01971e56`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.94, consistent with packed or encrypted content.
`objdata_02_off000894b5.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x894B5	990 bytes
SHA-256: `819742f5c84cbe7b646f281a2d66b550ab90b6860c2f5bde5cdca478f30b59a9`
`objdata_03_off00089caa.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x89CAA	612 bytes
SHA-256: `c62851521e10316dfd43f2b6ee67cc27e2a24456bb346c8fa9dc4a6d6e21d526`
`objdata_04_off0008a1aa.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8A1AA	380 bytes
SHA-256: `17e63036be0dbac77e35be89dbbfbf4e8c5055136fd574d2fd6018a721b22af7`
`objdata_05_off0008a4de.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8A4DE	882 bytes
SHA-256: `e0dd860bb62dee2108b913a024deb7f63abfad8765c6af0041159382d16d8717`
`objdata_06_off0008ac40.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8AC40	2633 bytes
SHA-256: `fe11c27d916ab897eb94064e9631d8a29c847a6db39259bef31578da8d19fdf5`
`objdata_07_off0008c158.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8C158	2601 bytes
SHA-256: `67ff079a9b0f053ca2843811d9da7a8fdedc7d9d377ef39d09dde148b9657c7f`

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