Malicious RTF — malware analysis report

Static analysis result for SHA-256 1ff94fd9ec5a8586…

MALICIOUS

RTF

441.6 KB First seen: 2019-05-16
MD5: c708970542ee8fb391c0a092734ee7a7 SHA-1: 9aeb1dd58fd38f006947d046ce17650f2a5aa061 SHA-256: 1ff94fd9ec5a8586eef3d5f770b47272452387cd20e95f4a8406b5f4e3a1fc69
122 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an OLE object that triggers an update, exploiting CVE-2017-0199. This exploit is designed to download and execute a payload from a weaponized URL. The embedded URL, https://a.doko.moe/jygzhr.hta, is highly suspicious and likely serves as the second-stage payload.

Heuristics 4

  • 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.
  • \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://a.doko.moe/jygzhr.hta In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00046bd1.bin rtf-objdata-decoded RTF \objdata at offset 0x46BD1 51185 bytes
SHA-256: 059ec1a5575094be80a3e35c2529c4852e6d823e8c7ac05b06ecbd4370804eb3

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