Malicious RTF — malware analysis report

Static analysis result for SHA-256 c9dd77b38387693b…

MALICIOUS

RTF

9.9 KB First seen: 2019-01-12
MD5: e0d9a150036ec313801a87f91bb0e0ce SHA-1: c8475345a57d92aae6259b7a44f177b1123cec09 SHA-256: c9dd77b38387693b7c47ac00e25ff70c41f6cdbb49b43e914e8d81738d3ab361
182 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for the execution of arbitrary code upon activation, likely leading to the download and execution of a secondary payload. The presence of the Equation Editor CLSID and the ".objupdate" directive strongly indicate this exploit.

Heuristics 5

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \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
    • http://bit.ly/2PNahOLIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000005e8.bin rtf-objdata-decoded RTF \objdata at offset 0x5E8 3618 bytes
SHA-256: b26b52ce5b75317495895db24927ad2a502f220e3596d50ee08b1ffb8bd09df5

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