Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 67075591d1f0efb0…

MALICIOUS

RTF / .DOC

282.8 KB First seen: 2022-02-25
MD5: 01ee5ca0dc992c55edc7fd617d029119 SHA-1: cdf53c8f756e3723e2eeb4b799f36b38ec4b2477 SHA-256: 67075591d1f0efb02281acca3c69ff90c9bf30eebcc6177fcc090a6b3658614d
200 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects and triggers CVE-2017-8570, which is known to drop a SCT script. The document body explicitly instructs the user to 'click Enable Editing when opening', indicating a lure to bypass security. This suggests the file is designed to exploit the vulnerability and execute a malicious script, likely for further payload delivery.

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.
  • \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 3 \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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000095b.bin
698cc86b3b5f07831b646654a4aa82172f457d09d5e94fc0ada197687e018d91		 rtf-objdata-decoded RTF \objdata at offset 0x95B 47644 bytes
objdata_01_off00018d15.bin
893d8db8585190a273d0c7c3dcff2eb58184b866a3687a9319ca72a8284876cb		 rtf-objdata-decoded RTF \objdata at offset 0x18D15 2632 bytes
objdata_02_off0001a2b8.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0x1A2B8 12297 bytes

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