Malicious RTF — malware analysis report

Static analysis result for SHA-256 4112d4801eca7e58…

MALICIOUS

RTF

5.6 KB First seen: 2019-09-30
MD5: 97ea8dda924ed84891fd55eedbccf621 SHA-1: 92daddacbb026b0d16ee1907081f9d55a1be3224 SHA-256: 4112d4801eca7e583fc8fc62aa8054625ada99e11feaae068262f801cf096ead
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 and is weaponized with a URL exploiting CVE-2017-0199. This exploit is designed to automatically link and update an OLE object, triggering the download and execution of a secondary payload, specifically a default.hta file from the IP address 192.168.106.132. The presence of the CVE-2017-0199 exploit indicates a malicious intent to execute arbitrary code from a remote source.

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://192.168.106.132:8080/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: 1e3acc815036edd3229c1c4cf2f96d4cb4c1a211e16c57459fa51018cbd9f591

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