Malicious RTF — malware analysis report

Static analysis result for SHA-256 ffb02048deab3cc1…

MALICIOUS

RTF

12.9 KB
MD5: 1d2825fc7d15f431b8ee04751e615774 SHA-1: ef6b9adca118ffa4ee46802e43705e677f539c2e SHA-256: ffb02048deab3cc1c87ad04a33fa802c44511fb7427a68d1a12eca38519342be
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an RTF document that contains an embedded OLE object, specifically triggering heuristics related to Equation Editor exploitation (CVE-2017-11882). The presence of ".objupdate" indicates that the embedded object is designed to be activated automatically. This strongly suggests the document is a malicious lure designed to exploit this known vulnerability for initial code execution.

Heuristics 4

  • 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
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000010ef.bin
73e3da9ed04893a742618f2c3b91892e5ce4a08928a94e6d79cf1f9d3ef4540c		 rtf-objdata-decoded RTF \objdata at offset 0x10EF 4180 bytes

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