Malicious RTF — malware analysis report

Static analysis result for SHA-256 199bf530c49eff60…

MALICIOUS

RTF

75.4 KB Created: 2017-07-24 22:03:00 First seen: 2017-08-08
MD5: b1edac681ba298342e48417e98ba2618 SHA-1: c1008acd87ea412690d469a381405c4e2540f2ff SHA-256: 199bf530c49eff60f2584166a4ee5586bbc191166724323d0e7d012d4c6810af
182 Risk Score

Malware Insights

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

The RTF file contains an OLE object that leverages CVE-2017-0199 to automatically link to a remote URL. This technique is commonly used to download and execute malicious payloads. The embedded URL points to 'https://virusscan.jotti.org/', which is likely the source of the second-stage malware. The file is detected by ClamAV as Rtf.Exploit.CVE_2017_0199-6335035-0.

Heuristics 5

  • 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.
  • 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://virusscan.jotti.org/ 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_off00002b2c.bin rtf-objdata-decoded RTF \objdata at offset 0x2B2C 2601 bytes
SHA-256: 46eed7c5ae06531c736a44e0c1062ea02299c217b8202d514339d9e7023eb942