Malicious RTF — malware analysis report

Static analysis result for SHA-256 828c041a42219cfc…

MALICIOUS

RTF

47.6 KB Created: 2017-11-30 01:32:00 First seen: 2017-12-08
MD5: 4c8890288e65b0cac8e7a92496d7a961 SHA-1: 1e25cdf9e21226552a11449a7edfb697cb473ad6 SHA-256: 828c041a42219cfc983b5aae30edb281758403b854f8f917110fd7169c62b7db
182 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an OLE object that is automatically linked, exploiting CVE-2017-0199. This exploit targets a weaponized URL which, when accessed, downloads a second-stage HTA payload. The presence of the OLE object and the specific CVE exploit indicate a clear intent to execute arbitrary code from a remote source.

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.
  • 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.
  • 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://rgho.st/download/784cNwycT/24151df7530b15abc7987f84c7838ea87772f980/2.hta In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002ab2.bin rtf-objdata-decoded RTF \objdata at offset 0x2AB2 3202 bytes
SHA-256: 2446b08448b31523a4aef1294fa318d7c4de1250982d8ef06f6011060288c485

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