RTF malware analysis — malicious · 6589d21d020dea2f

MALICIOUS

RTF

950.8 KB First seen: 2019-01-25

MD5: 829a4df5c6ec3bdf96e8f0a0706eaf09 SHA-1: 149b256464c4a59e423dc5c7948f1b2e3501f7d8 SHA-256: 6589d21d020dea2f0563d730bb3d266e7164cd82f3a32061a64f743934d51e84

184 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains OLE object data and triggers heuristics related to CVE-2017-8570, indicating it exploits a vulnerability to drop a script. The embedded OLE object data, specifically objdata_01_off000001ee.bin, is the primary artifact associated with this exploit. The exploit likely leads to the execution of a second-stage payload, potentially JavaScript, given the nature of the CVE.

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://schemas.openxmlformats.org/drawingml/2006/main 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	451787 bytes
SHA-256: `533fc7b31ab79bfdbe9980673a1aca87cc762bc0051c804a32599a401e83f413`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.85, consistent with packed or encrypted content.
`objdata_02_off000dd109.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xDD109	990 bytes
SHA-256: `819742f5c84cbe7b646f281a2d66b550ab90b6860c2f5bde5cdca478f30b59a9`
`objdata_03_off000dd8fe.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xDD8FE	26316 bytes
SHA-256: `89d1c0807f4d4dd2dbc3c5357fc9e55a3129223e5915f30eec025828c74b2682`
`objdata_04_off000ea6ce.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEA6CE	380 bytes
SHA-256: `17e63036be0dbac77e35be89dbbfbf4e8c5055136fd574d2fd6018a721b22af7`
`objdata_05_off000eaa02.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEAA02	882 bytes
SHA-256: `e0dd860bb62dee2108b913a024deb7f63abfad8765c6af0041159382d16d8717`
`objdata_06_off000eb164.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEB164	2633 bytes
SHA-256: `fe11c27d916ab897eb94064e9631d8a29c847a6db39259bef31578da8d19fdf5`
`objdata_07_off000ec67c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEC67C	2601 bytes
SHA-256: `67ff079a9b0f053ca2843811d9da7a8fdedc7d9d377ef39d09dde148b9657c7f`

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