RTF malware analysis — malicious · a3bf5249a547a1f7

MALICIOUS

RTF

540.4 KB First seen: 2019-01-11

MD5: cf684f7d8182f7eaa55bacac605e58dd SHA-1: 46ff6544e9fd21d76f60e691c14b89722b04d99b SHA-256: a3bf5249a547a1f7c31b5799d03a9217021528c53db018217090330e6f95da2f

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 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.

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	260560 bytes
SHA-256: `94cfe73da45ba3e95f5da2b2312c03c373be902e4ba20db5e6e969fc80ec184f`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.92, consistent with packed or encrypted content.
`objdata_02_off00083097.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x83097	990 bytes
SHA-256: `819742f5c84cbe7b646f281a2d66b550ab90b6860c2f5bde5cdca478f30b59a9`
`objdata_03_off0008388c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8388C	612 bytes
SHA-256: `c62851521e10316dfd43f2b6ee67cc27e2a24456bb346c8fa9dc4a6d6e21d526`
`objdata_04_off00083d8c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x83D8C	380 bytes
SHA-256: `17e63036be0dbac77e35be89dbbfbf4e8c5055136fd574d2fd6018a721b22af7`
`objdata_05_off000840c0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x840C0	882 bytes
SHA-256: `e0dd860bb62dee2108b913a024deb7f63abfad8765c6af0041159382d16d8717`
`objdata_06_off00084822.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x84822	2633 bytes
SHA-256: `fe11c27d916ab897eb94064e9631d8a29c847a6db39259bef31578da8d19fdf5`
`objdata_07_off00085d3a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x85D3A	2601 bytes
SHA-256: `67ff079a9b0f053ca2843811d9da7a8fdedc7d9d377ef39d09dde148b9657c7f`

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