Malicious RTF — malware analysis report

Static analysis result for SHA-256 3fec4e308b359589…

MALICIOUS

RTF

9.9 KB First seen: 2019-11-20
MD5: 144ad38a00db5fafa57b7797f30a5f35 SHA-1: 9011c8046ef0ea3e938484d84223f124f0ef97d9 SHA-256: 3fec4e308b3595890a50d217b4741cf705ef9c4edbb508948be8c6df9e6d1aa3
182 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that triggers the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for arbitrary code execution when the object is activated. The presence of the CLAMAV_DETECTION heuristic further confirms the malicious nature of the file, specifically identifying it as a known exploit for CVE-2017-11882.

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/2R6eptAIn 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: 72769e4345dc7b2df93ced13ab859d35623dacae9cf9581eccb2d47dfa7609e3

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