Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 18d9c48a5458f2c6…

MALICIOUS

RTF / .DOC

283.5 KB First seen: 2022-02-21
MD5: 6dd71f4d35477416e130ae3b60ba46b8 SHA-1: fcd53cc55e5c8cfec7aee9824c7453a7d5237d42 SHA-256: 18d9c48a5458f2c607fbc24c2434abc20dd61c2fa2a277218bfac369738b518d
200 Risk Score

Malware Insights

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

The RTF document contains OLE objects and triggers heuristics related to CVE-2017-8570, which is known to drop SCT scripts. The document body contains a lure instructing the user to 'Enable Editing', indicating a social engineering attempt to bypass security measures. The exploitation of CVE-2017-8570 likely leads to the execution of a script that downloads and runs a second-stage 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_off00000ba2.bin
1fa96e4c9d9d9627ff463c8fb5746963e80169c3507bbf1690ba025de7477f21		 rtf-objdata-decoded RTF \objdata at offset 0xBA2 47725 bytes
objdata_01_off00019004.bin
893d8db8585190a273d0c7c3dcff2eb58184b866a3687a9319ca72a8284876cb		 rtf-objdata-decoded RTF \objdata at offset 0x19004 2632 bytes
objdata_02_off0001a5a7.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0x1A5A7 12297 bytes

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