Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 153d0278268d1ba4…

MALICIOUS

RTF / .DOC

295.5 KB
MD5: dbecba4a6211aba561e0d36f9db4b1d2 SHA-1: f808acedb937fcf07cd2b2c801a84cf290272b65 SHA-256: 153d0278268d1ba4248fcc47b93d6098c023c22ae0148e570e5f97810ae1dc4a
240 Risk Score

Malware Insights

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

The RTF document contains multiple indicators of OLE object manipulation, specifically related to CVE-2017-8570, which is known to drop SCT scripts. The document body explicitly instructs the user to 'enable Editing' and implies macros are necessary for proper functionality, serving as a lure. The presence of composite monikers and objdata sections strongly suggests the embedded OLE object is designed to execute arbitrary code, likely an SCT script, to download and run 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_off0000096e.bin
a88c63606d0e180166543c8f36289268e36715af8d089019bd882d8dc6e77fb9		 rtf-objdata-decoded RTF \objdata at offset 0x96E 40504 bytes
objdata_01_off0000711d.bin
65e8ecd1c35e716331245871f682d11cfb2509f5badf99f36d5cd7b3ace7f6f4		 rtf-objdata-decoded RTF \objdata at offset 0x711D 40477 bytes
objdata_02_off0001ba9e.bin
3cd3b7d42e5855c90d6d11c54ef2670ed8970441480cc23f7d39ef08fa1c935b		 rtf-objdata-decoded RTF \objdata at offset 0x1BA9E 2632 bytes
objdata_03_off0001d041.bin
e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7		 rtf-objdata-decoded RTF \objdata at offset 0x1D041 12297 bytes

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