Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 831c05bf50197bf7…

MALICIOUS

RTF / .DOC

346.9 KB
MD5: 5d59d508aa92d37beb98762f12488968 SHA-1: 85fc7d3884591af9d7214c7d1b2d57c6ab4c77b5 SHA-256: 831c05bf50197bf78c2744d445c9a70f621e94fcedaef7f90563f84f234aa5cb
220 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains OLE objects and triggers heuristics related to CVE-2017-8570, indicating it exploits this vulnerability. This exploit is known to drop and execute script files, likely for downloading additional payloads or establishing a foothold on the system. The document body content is heavily garbled and does not provide clear user-facing text, suggesting its primary purpose is exploitation rather than social engineering.

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.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 4 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000007da.bin
c82a88b2edf911ff37466b3499a1ea1c10f6df6d78f9388c1dc19b57c7eb816e		 rtf-objdata-decoded RTF \objdata at offset 0x7DA 65990 bytes
objdata_01_off00006f89.bin
858ec51b226c929c18ea69122fbb5aa739fd3e8678678cb77cfe41ac1b1ac225		 rtf-objdata-decoded RTF \objdata at offset 0x6F89 65963 bytes
objdata_02_off0002881c.bin
32e8e449cdc043249ce37c79c9eaf2af80a02cb8175718a8a0ce726d961b7d16		 rtf-objdata-decoded RTF \objdata at offset 0x2881C 2632 bytes
objdata_03_off00029dbf.bin
e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7		 rtf-objdata-decoded RTF \objdata at offset 0x29DBF 12297 bytes

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