Malicious RTF — malware analysis report

Static analysis result for SHA-256 f72a195fe875fa40…

MALICIOUS

RTF

2.40 MB Created: 2017-12-20 10:52:00 First seen: 2017-12-24
MD5: 6305468f035d8069d2fbbf89b326cfeb SHA-1: 12a2e4e43f1aa36e518cb43677ee1e4119ed312e SHA-256: f72a195fe875fa40926ed4979c9fe44d6e6649e675f25f85a775888235134f0d
182 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains OLE object data and an automatically linked OLE object, indicative of a malicious document. The critical finding is the exploitation of CVE-2017-0199, which uses a remote URL moniker to fetch and execute a payload. The embedded URLs suggest the sample attempts to download a second-stage payload from 'todpot.tk'.

Heuristics 6

  • 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~2476KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM
    RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
  • 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://todpot.tk/0346/t.php?stats=send&thread=0 In RTF body
    • http://todpot.tk/0346/t.php?thread=0&t=hIn 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_off0025f3c4.bin rtf-objdata-decoded RTF \objdata at offset 0x25F3C4 4392 bytes
SHA-256: 433c91948c550a2a4f33667ae82aedce15cf8146d850d58d42792fc1167a178e

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