Malicious RTF — malware analysis report

Static analysis result for SHA-256 b6b4054ec93c6ed1…

MALICIOUS

RTF

5.6 KB First seen: 2019-01-20
MD5: 66a8cf4f9075d122200895f76808cce4 SHA-1: 9272fab29dc19e5c431721057157e81c2fcae83c SHA-256: b6b4054ec93c6ed14356a56d32136b859f8410ad6f6fafe2ca8fc8e8a5c23796
222 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data that is automatically linked and updated, exploiting CVE-2017-0199. This exploit is designed to download and execute a secondary payload from the specified URL, http://192.168.246.1:8080/default.hta, which is a common technique for delivering further malicious content.

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://192.168.246.1:8080/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: 5ee3cc982a0517b20299fdd1b7050688befb3342357dec002f32c89887c2fa4a

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