Malicious RTF — malware analysis report

Static analysis result for SHA-256 288cce3c4e0a18ac…

MALICIOUS

RTF

44.7 KB First seen: 2019-06-27
MD5: 1a492b85af130585c3c099feb540eaca SHA-1: c3fa4c4658a13d6b1f2738b722310bd0fba206ba SHA-256: 288cce3c4e0a18ac881001bc31295a602cbdeb17f2ca6f281682c6ff441c433b
160 Risk Score

Malware Insights

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

The RTF file contains OLE object data that is automatically linked and updated, triggering exploitation of CVE-2017-0199 or CVE-2017-8759. This vulnerability allows the embedded OLE object to act as a loader for a second-stage payload, likely downloaded from a remote source. The specific URL or payload is not statically determinable from the provided evidence.

Heuristics 4

  • CVE-2017-0199 / CVE-2017-8759 (OLE2Link auto-activated remote loader) critical CVE related RTF_OLE2LINK_REMOTE_MONIKER_LOADER
    RTF embeds an OLE2Link object that is force-activated with \objupdate (no user interaction on open) and fetches a remote second stage — through an INCLUDETEXT/INCLUDEPICTURE field or the OLE object's own moniker. This is the OLE2Link auto-update attack path shared by CVE-2017-0199 (server returns an HTA/scriptlet) and CVE-2017-8759 (server returns a SOAP WSDL the .NET parser compiles). Office processes the fetched response through the same code path; the specific CVE depends on the now-unreachable server content type.
  • 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_off000050a4.bin rtf-objdata-decoded RTF \objdata at offset 0x50A4 2639 bytes
SHA-256: bd53d9ffc100dd742449d3f16288f1036581e20ab39e4999c163b0af42ca4387

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