Malicious RTF — malware analysis report

Static analysis result for SHA-256 dc5cb169b3a831d6…

MALICIOUS

RTF

8.19 MB First seen: 2019-04-18
MD5: b0ab8beeb2725e8be371a42028a0d20e SHA-1: 433aa9aadc00ef955100e989dc0f9b6f149469ab SHA-256: dc5cb169b3a831d67eb42a06140564efa9ad6334d09ce10aaa82462626f90852
224 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious activity, including OLE object data and a critical finding for CVE-2017-8570, which is known to drop SCT scripts. The presence of large hex data blocks within OLE objects suggests a hidden payload. The exploitation of CVE-2017-8570 likely leads to the execution of a script, potentially JavaScript, which is then used to carry out further malicious actions.

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 ~2211KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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.microsoft.com/SMI/2005/WindowsSettings In RTF body
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn RTF body

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
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 1105943 bytes
SHA-256: 126d7125eca4ca539f627dcbcefe2ce0afd0430c3518006ebbe54908377e4821
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.83, consistent with packed or encrypted content.
objdata_02_off0081fcaf.bin rtf-objdata-decoded RTF \objdata at offset 0x81FCAF 990 bytes
SHA-256: 819742f5c84cbe7b646f281a2d66b550ab90b6860c2f5bde5cdca478f30b59a9
objdata_03_off008204a4.bin rtf-objdata-decoded RTF \objdata at offset 0x8204A4 26316 bytes
SHA-256: 606145c7bfce5c000729bc1389ffd6453bd3c033f89d75e214b4a3ab94781620
objdata_04_off0082d274.bin rtf-objdata-decoded RTF \objdata at offset 0x82D274 380 bytes
SHA-256: 17e63036be0dbac77e35be89dbbfbf4e8c5055136fd574d2fd6018a721b22af7
objdata_05_off0082d5a8.bin rtf-objdata-decoded RTF \objdata at offset 0x82D5A8 882 bytes
SHA-256: e0dd860bb62dee2108b913a024deb7f63abfad8765c6af0041159382d16d8717
objdata_06_off0082dd0a.bin rtf-objdata-decoded RTF \objdata at offset 0x82DD0A 2633 bytes
SHA-256: fe11c27d916ab897eb94064e9631d8a29c847a6db39259bef31578da8d19fdf5
objdata_07_off0082f222.bin rtf-objdata-decoded RTF \objdata at offset 0x82F222 2601 bytes
SHA-256: 67ff079a9b0f053ca2843811d9da7a8fdedc7d9d377ef39d09dde148b9657c7f

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