Malicious RTF — malware analysis report

Static analysis result for SHA-256 0366e6f59f94651e…

MALICIOUS

RTF

662.3 KB
MD5: 34e3b4a75f2f6a7a7b11296ff6dba01f SHA-1: d10d95285be5981172a1ffc67d4cf1e7ef57e412 SHA-256: 0366e6f59f94651e2db05a2275584a1fe93f992d937e9666fbec60d78edc6f85
240 Risk Score

Malware Insights

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

The RTF file contains multiple indicators of malicious OLE object manipulation, specifically related to CVE-2017-8570 and the use of composite monikers. The document body explicitly instructs the user to 'Enable Editing' and 'download the document', which is a common lure to bypass security measures. The presence of OLE objects and the CVE-2017-8570 heuristic strongly suggest the file is designed to drop and execute a secondary payload, likely a script.

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.
  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000965.bin
e99478167eb950f9824a1e88fa6f229a1e3a02f9b1dce2516c133e33ab85db36		 rtf-objdata-decoded RTF \objdata at offset 0x965 221073 bytes
objdata_01_off00007114.bin
fc49fc154c1254bf2fcf4c446fe17844d0d52f8a247e786d1ce3886179b634e9		 rtf-objdata-decoded RTF \objdata at offset 0x7114 221046 bytes
objdata_02_off000775b5.bin
51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645		 rtf-objdata-decoded RTF \objdata at offset 0x775B5 2632 bytes
objdata_03_off00078b58.bin
e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7		 rtf-objdata-decoded RTF \objdata at offset 0x78B58 12297 bytes

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