Malicious RTF — malware analysis report

Static analysis result for SHA-256 bf55c5e009b26a31…

MALICIOUS

RTF

29.3 KB First seen: 2019-03-10
MD5: af06f04db940d2862095069120aa3d9a SHA-1: 6e7ac388438dc45022ea5edcee6d4144e842c9fa SHA-256: bf55c5e009b26a314d4a5be519d61cfbc309533dd970fbffc8c29e3b53d150b3
82 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object with an \objupdate directive, indicating an attempt to exploit a vulnerability and execute code. The presence of OLE object data and the objupdate heuristic strongly suggest exploitation for client execution. While the specific exploit is not detailed, the structure points to a malicious document, likely delivered as a spearphishing attachment.

Heuristics 4

  • \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 OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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_off000066e6.bin rtf-objdata-decoded RTF \objdata at offset 0x66E6 1800 bytes
SHA-256: 0c58234589bef861cafd021ae35de3468e804bb17695fe9f5bff0b3b350cfbfc

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