RTF malware analysis — malicious · afb7c964413f4fd0

MALICIOUS

RTF

2.28 MB First seen: 2019-01-11

MD5: 434fefbb266f4793d4774b085df90045 SHA-1: c2844be8c81e4778fc146f9cc4f75b396d335550 SHA-256: afb7c964413f4fd0fea3506a52df412a33562184b576a5e42fb1627f03db9335

242 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious activity, including the exploitation of CVE-2017-8570 via composite moniker and embedded OLE objects. The heuristic firings strongly suggest that the file is designed to drop and execute a script, likely a second-stage payload, as indicated by the presence of shellcode API strings in an extracted artifact. The embedded OLE object data, particularly objdata_01_off0000021e.bin, is a primary suspect for containing the malicious script.

Heuristics 8

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~2381KB of hex-encoded data inside \objdata sections — may hide a payload
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 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.
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://schemas.microsoft.com/office/word/2003/wordml In RTF body

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	362187 bytes
SHA-256: `8805ae517f95fab45fda724c16e62036f0c22bb7e84271552f7f968f86333be9`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL, SC_STR_LOADLIBRARY Static shellcode analysis recovered API/import strings: LoadLibraryW, GetProcAddress
`objdata_02_off000c95e0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC95E0	1068 bytes
SHA-256: `2b28d78ceb2a564ae30f2b6865926b068f3f920a373c2e3fc4cb865091eddd89`
`objdata_03_off000c9e6b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC9E6B	777454 bytes
SHA-256: `bb4d3416870d64217d29d4df317c8a8ef1655d9eab4a95a550e7b03cb2edee20`
`objdata_04_off00245879.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x245879	369 bytes
SHA-256: `3c0b4878e98d51d984a06b9ba36e54869ecd67e41f335730fced4ca28976d877`
`objdata_05_off00245b8f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x245B8F	890 bytes
SHA-256: `21dcdf875b1972c61c0e8c2c2123f9a95c8f29fb4a2cf8bf52511b328881de8e`
`objdata_06_off002462ea.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2462EA	2633 bytes
SHA-256: `27c6d10cfe7974ebf40c1200cc005f9878cc37b7d49ece9cbc396d700c38918a`

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