Malicious RTF — malware analysis report

Static analysis result for SHA-256 fec18103baa758d6…

MALICIOUS

RTF

8.4 KB Authoring application: Riched20 6.3.9600
MD5: 0673c2df7827470bce2d2353e6283f71 SHA-1: 551483aa0b7cfe4980df1034d15610db5ee1804a SHA-256: fec18103baa758d6718f92f4bc64b1880d604fb06eba5324cb652a8a92cb6401
260 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains critical heuristics indicating exploitation of the Equation Editor vulnerability (CVE-2017-11882). The presence of OLE object data and explicit triggers for OLE activation further support this. This exploit is designed to execute arbitrary code upon opening the document.

Heuristics 6

  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • 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 OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000100.bin
2bb8cc0b3482f86ec7dfa690303447d767aa1d4fb701088d34b65818f328fda0		 rtf-objdata-decoded RTF \objdata at offset 0x100 3546 bytes

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