Malicious RTF — malware analysis report

Static analysis result for SHA-256 273a2eb970b15924…

MALICIOUS

RTF

5.6 KB First seen: 2019-08-04
MD5: 17aba9b0984891bf3263fd2659712a28 SHA-1: 7afb599f47c147c4c3f1bac29f8c3107d36d1bba SHA-256: 273a2eb970b15924d2411527c5490d219a3800e8eb5d587e9ba3339dc5d0451b
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an OLE object that exploits CVE-2017-0199. This exploit is designed to automatically link to and download a payload from a specified URL. The extracted URL, https://files.catbox.moe/shx7bt.hta, is highly suspicious and likely contains the secondary payload. The file's structure and the presence of the CVE-2017-0199 exploit indicate a malicious intent to execute remote code.

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 https://files.catbox.moe/shx7bt.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_off000001a2.bin rtf-objdata-decoded RTF \objdata at offset 0x1A2 2601 bytes
SHA-256: fd72d4afc1fc0b388fa5b72dad301159d04d4a7ea89306892fd2e9f1ec2b55a4

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