Malicious RTF — malware analysis report

Static analysis result for SHA-256 f789884ce27f6cbd…

MALICIOUS

RTF

37.5 KB First seen: 2019-05-31
MD5: 6c26a4e626bd7ac4819d291ac490e84a SHA-1: 137563acf9048c32095f3c16ba6a5a4fc80d5b4a SHA-256: f789884ce27f6cbdacb69ee0de607f6280109cbfbb59552bb4e8f3795905348a
62 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object, indicated by the RTF_OBJDATA heuristic. The RTF_OBJUPDATE heuristic suggests that this object is designed to be activated, likely exploiting a vulnerability to execute code. While no specific exploit is identified, the presence of an OLE object and the update directive strongly suggest an attempt to execute a secondary payload, potentially downloaded from an external source.

Heuristics 3

  • \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://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000087bd.bin rtf-objdata-decoded RTF \objdata at offset 0x87BD 1800 bytes
SHA-256: 0b678e3bb5f0b7fe447ebbb5cead91b4946a2cec6c4c5fa27df9e9b6a4cf15be

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