Malicious RTF — malware analysis report

Static analysis result for SHA-256 8819d6a3054b2d25…

MALICIOUS

RTF

6.2 KB First seen: 2017-11-29
MD5: 55f661e28158762994f553f0bd252946 SHA-1: 705df8814afca470eec63e0f4860a4a605fafeea SHA-256: 8819d6a3054b2d255fbda4716b9d0de32db1789fc7b17583330f9850663d3142
162 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an OLE object that is automatically linked and updated, exploiting CVE-2017-0199. This vulnerability is used to download and execute a remote HTA file from http://bellasimpson.com/en.hta, which likely serves as a second-stage payload. The embedded OLE object data and the weaponized URL are strong indicators of malicious intent.

Heuristics 5

  • CVE-2017-0199 (OLE2Link / weaponized URL) critical CVE exact CVE_2017_0199_WEAPONIZED_URL
    RTF contains a URL Moniker OLE link to a script/HTA/template-style remote loader, matching the tighter static CVE-2017-0199 shape.
  • 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 http://bellasimpson.com/en.hta In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003e.bin rtf-objdata-decoded RTF \objdata at offset 0x3E 3125 bytes
SHA-256: c0d8e2387478b4388dd3daa7e361d5ded197c0275263b5899006afba9f41aee9

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