Malicious RTF — malware analysis report

Static analysis result for SHA-256 4b1c4b310d66ea99…

MALICIOUS

RTF

6.9 KB First seen: 2018-02-19
MD5: 39f40bdac5faf016433eb1ab6236b690 SHA-1: 6069c83a9f71c13ada359c596a67a2fcfa7dcfd2 SHA-256: 4b1c4b310d66ea9911a796ed52038034f87536e8aeedb266f782dcceeff69f88
162 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data and is configured to automatically update and activate it, exploiting CVE-2017-0199. This exploit is used to download a payload from the specified URL, indicating a likely initial access vector via spearphishing attachment. The exact nature of the second-stage payload cannot be determined from the provided evidence.

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.
  • 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://dropcanvas.com/jo868/1 In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003f.bin rtf-objdata-decoded RTF \objdata at offset 0x3F 3313 bytes
SHA-256: a71dfa11e8d9e0db8a00b2affb74dc363b2ba7f43d269c565e64bcd19f36bb0a

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