Malicious RTF — malware analysis report

Static analysis result for SHA-256 de9984a749ffdf40…

MALICIOUS

RTF

5.6 KB Authoring application: Msftedit 5.41.21.2510 First seen: 2019-11-20
MD5: d99ae74fbd6551e853921f9fc3358461 SHA-1: c8af56cb88c70f3a7b6f307334f94c6b14a2d902 SHA-256: de9984a749ffdf40de6ef1ba9ca4f3ee99556697e8f320b24f03d8ca169874b2
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object that is automatically linked and updated, indicating an attempt to exploit vulnerabilities. Specifically, the critical heuristic firing for CVE-2017-0199 confirms the exploitation of a remote URL moniker vulnerability. This technique is commonly used to download and execute a second-stage payload, making the file a malicious attachment delivered via spearphishing.

Heuristics 6

  • CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
  • 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 1 \objdata section(s) — embedded OLE objects
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.baidu.com In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000105.bin rtf-objdata-decoded RTF \objdata at offset 0x105 2724 bytes
SHA-256: 801364636ae4e125f538cef0ec772f2b7df4fa576c0e47fefe90c09f3edb87c0

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