Malicious RTF — malware analysis report

Static analysis result for SHA-256 e3826bd51cdea790…

MALICIOUS

RTF

76.1 KB Created: 2017-11-27 21:44:00 First seen: 2017-12-08
MD5: 7afba2b281110f8c0ff146d513f6ac21 SHA-1: 4f3e3136615b4b99f63f73d8c7628d480795d26a SHA-256: e3826bd51cdea790be0e45dbf4099e8dfe19c0109b0b9d4b8c5df6cc82d60e31
182 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an OLE object with an automatically linked URL that exploits CVE-2017-0199. This exploit is designed to download and execute a second-stage payload, identified as an HTA file from the URL http://rgho.st/download/75CY65wHQ/f0450aca55eea69de1c33d9f7886028257603f8f/1.hta. The ClamAV detection further confirms the malicious nature of this exploit.

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/75CY65wHQ/f0450aca55eea69de1c33d9f7886028257603f8f/1.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_off00002a97.bin rtf-objdata-decoded RTF \objdata at offset 0x2A97 3113 bytes
SHA-256: 88a8a26a69acdbbbe8757cddb92d00268e3ffe9ba97fe2b4db65fdd9f5cf77c2

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