Malicious RTF — malware analysis report

Static analysis result for SHA-256 8b4b74e10e27beef…

MALICIOUS

RTF

5.6 KB First seen: 2018-01-23
MD5: c4d094616cb2bd2e59a8c92250467aa5 SHA-1: 852b23497785805a35ea2eb42d47d69ab0f14b92 SHA-256: 8b4b74e10e27beefcc53d5a4b00864e94d168d753293329bc9b17ec7740c8eb4
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an OLE object with an automatically linked and updated OLE object, indicative of exploitation. Specifically, it leverages CVE-2017-0199 to embed a URL that points to a remote HTA file. This HTA file is likely a second-stage payload, designed to be downloaded and executed by the vulnerable application.

Heuristics 6

  • 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.
  • \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://192.168.20.80:8080/default.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_off000001b4.bin rtf-objdata-decoded RTF \objdata at offset 0x1B4 2601 bytes
SHA-256: 28e0c13a96ad74395313446182b81e011e64b0a6e401ebbf2bcb4d183c94101a

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