Malicious RTF — malware analysis report

Static analysis result for SHA-256 ccb8a6ef35631a2c…

MALICIOUS

RTF

5.6 KB Authoring application: Msftedit 5.41.21.2510 First seen: 2018-07-14
MD5: a073bfa626db0b9a9514facf2ebdd987 SHA-1: 351af468489146158150edb5596ee28ec9f3eecf SHA-256: ccb8a6ef35631a2c2a50bb3feb50a3f870502394da52efea888f10729e55ec07
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object that is automatically linked and updated, indicating an attempt to activate remote content. The critical CVE-2017-0199 heuristic confirms the exploitation of a remote URL moniker vulnerability, specifically targeting http://192.168.80.141:8080//. This technique is commonly used to download and execute malicious payloads, likely as part of a spearphishing campaign.

Heuristics 6

  • CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • 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://192.168.80.141:8080// In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000104.bin rtf-objdata-decoded RTF \objdata at offset 0x104 2724 bytes
SHA-256: 88891e4b3fda39f9c27078e4b2da4933f868950b4cd45e28f3662f479456103d

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