Malicious RTF — malware analysis report

Static analysis result for SHA-256 fd7ad3f6bb0c462e…

MALICIOUS

RTF

4.6 KB Authoring application: Msftedit 5.41.21.2510 First seen: 2018-08-05
MD5: 1187d9cc2cdeb0560f3959294b9ef323 SHA-1: 9a44676c6ccc708af3feae60a5dd5693dae6bfe4 SHA-256: fd7ad3f6bb0c462e3e875c7228d7be39bf3118a2df9f9340839641276aab4660
200 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 exploit vulnerabilities. ClamAV detection confirms this, identifying it as Rtf.Exploit.CVE_2017_0199-6335035-0, which is known to exploit a remote code execution vulnerability in Microsoft Office. The primary attack vector is likely spearphishing attachment.

Heuristics 5

  • URL Moniker in RTF OLE object high CVE related RTF_URL_MONIKER_RELATED
    RTF contains a URL Moniker GUID in OLE object context, but no decoded remote target was confirmed. Treat as related OLE2Link attack-surface evidence rather than proof of CVE-2017-0199 exploitation.
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000104.bin rtf-objdata-decoded RTF \objdata at offset 0x104 2224 bytes
SHA-256: 147cd98742af8396fd0feb58990bfcab8eb9d684d9ab0c4842e109b1ac356a4e