Malicious RTF — malware analysis report

Static analysis result for SHA-256 b9f6880bdb535c20…

MALICIOUS

RTF

1.86 MB Authoring application: Riched20 6.3.9600
MD5: 4f20f9c7128d525d2a31c9e17e652954 SHA-1: aa15b5b441ff94d8003d75bb75baf7ebce0dcd94 SHA-256: b9f6880bdb535c20df048bacaaf7587f48f0bd8e98cefb258ef8915836126fd7
260 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of OLE object manipulation, specifically related to CVE-2017-8570. This vulnerability allows for the execution of arbitrary code by exploiting composite monikers. The presence of large hex-encoded data within OLE objects suggests a hidden payload. The document body content is garbled and does not provide specific lures.

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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1727KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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_off000d70ef.bin
2e17a7d62cc4a73f1a8b38892c7cadeee9942138929866331088543b6817fab5		 rtf-objdata-decoded RTF \objdata at offset 0xD70EF 408264 bytes
objdata_01_off000dd89e.bin
04591b21d24e8d0b5242686e1d2cdba47cbc3951371a54619814b7f9fb0c89ea		 rtf-objdata-decoded RTF \objdata at offset 0xDD89E 408237 bytes
objdata_02_off001ace2b.bin
51ef705eef602ac6eb91c2063c8f50d4e54b5e051b60429031d41133bc7df645		 rtf-objdata-decoded RTF \objdata at offset 0x1ACE2B 2632 bytes
objdata_03_off001ae3ce.bin
e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7		 rtf-objdata-decoded RTF \objdata at offset 0x1AE3CE 12297 bytes

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