Malicious RTF — malware analysis report

Static analysis result for SHA-256 0d53b5a40827b57f…

MALICIOUS

RTF

662.9 KB
MD5: 25d00e4865fa8c6f78653df174513729 SHA-1: b4c0746f607c69e7a5f10bf4aedae480825f5a24 SHA-256: 0d53b5a40827b57fa7fdc6de6cb75d07476f93d01f3e3098e1574585155f5865
240 Risk Score

Malware Insights

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

The RTF file contains multiple indicators of OLE object manipulation, specifically related to CVE-2017-8570, which is known to drop SCT scripts. The document body includes a lure instructing the user to 'Enable Editing', a common tactic to bypass macro security. The presence of OLE objects and the CVE-2017-8570 heuristic strongly suggest the file is designed to execute a secondary payload.

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_off00000bac.bin
3a1ecd89b11568ac1a678f2fe48c4ed78304564049501f831c9267f1dbaf10ee		 rtf-objdata-decoded RTF \objdata at offset 0xBAC 221077 bytes
objdata_01_off0000735b.bin
6a6dbc3554ee796b6da3cca57845a4c7881855826d765ec5c604ec59f918ac5b		 rtf-objdata-decoded RTF \objdata at offset 0x735B 221050 bytes
objdata_02_off00077804.bin
51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645		 rtf-objdata-decoded RTF \objdata at offset 0x77804 2632 bytes
objdata_03_off00078da7.bin
e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7		 rtf-objdata-decoded RTF \objdata at offset 0x78DA7 12297 bytes

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