Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 078a2a91e21f63c4…

MALICIOUS

RTF / .DOC

282.8 KB First seen: 2022-02-24
MD5: ea1b6482cc2faebdf2c7f9feeec4e4d6 SHA-1: 9b0d88e85799c45507e747f53b9c66335686ec42 SHA-256: 078a2a91e21f63c459957d7ad20015209ce9b10bac9e24116d351924018da977
200 Risk Score

Malware Insights

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

The RTF document contains OLE object data and triggers heuristics related to CVE-2017-8570, which is known to drop SCT scripts. The document body instructs the user to 'Enable Editing', a common lure to bypass macro security. This suggests the file is designed to exploit this vulnerability to execute a secondary payload.

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
bf5d99fb8720f6de7ab2daa84f94608110930a7a6d07ea75d7b60eda45f92aed		 rtf-objdata-decoded RTF \objdata at offset 0x95B 47648 bytes
objdata_01_off00018d1d.bin
893d8db8585190a273d0c7c3dcff2eb58184b866a3687a9319ca72a8284876cb		 rtf-objdata-decoded RTF \objdata at offset 0x18D1D 2632 bytes
objdata_02_off0001a2c0.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0x1A2C0 12297 bytes

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