Malicious RTF — malware analysis report

Static analysis result for SHA-256 3a3cb0e7f2c06804…

MALICIOUS

RTF

18.3 KB First seen: 2019-06-27
MD5: a296cc6e3100b53a0e76a014453f8acc SHA-1: 20ac1fd62c35e6ad11995fa703febf9d51c3c859 SHA-256: 3a3cb0e7f2c06804d7ad4ddafbc095119ebe4082f4ceccd7fc6a37336577c572
182 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document that contains an embedded OLE object, specifically triggering heuristics related to Equation Editor and OLE object activation. ClamAV signature Rtf.Exploit.CVE_2017_11882-6584355-1 directly identifies this as an exploit for CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the document is opened.

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/2pOCGbWIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000028ab.bin rtf-objdata-decoded RTF \objdata at offset 0x28AB 3618 bytes
SHA-256: b068b3c28b4fd30f692e397030628cb73fbb6a0cf83c8b78cff4e77e5e0d2fdc