Malicious RTF — malware analysis report

Static analysis result for SHA-256 9803e829b0f0642f…

MALICIOUS

RTF

5.6 KB First seen: 2019-12-09
MD5: 24294020f1cd16d2f5562fc797f929cb SHA-1: 820d1d5a49b76bb291e61a5ec9d4cd1c68c1cc5d SHA-256: 9803e829b0f0642f7d9ab77273973723489048471e497bafd98a2efb290053c9
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an OLE object that is automatically linked and updated, exploiting CVE-2017-0199. This exploit is designed to download and execute a secondary payload from the embedded URL http://172.241.166.106/~dave/1_com/2/olas.hta. The ClamAV detection 'Doc.Dropper.Agent' further supports its role as a dropper.

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: Doc.Dropper.Agent-6487791-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6487791-0
  • 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://172.241.166.106/~dave/1_com/2/olas.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_off000001ab.bin rtf-objdata-decoded RTF \objdata at offset 0x1AB 2601 bytes
SHA-256: a062015da432b6787c116a4945d8f914c47b9980026fb21e6fd3567c56d6f839

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