Malicious RTF — malware analysis report

Static analysis result for SHA-256 81b2f2bf41aa665a…

MALICIOUS

RTF

8.2 KB First seen: 2019-01-11
MD5: 5addb7eccad7c1cd43857bf9c929c40c SHA-1: c65d42d61c8aac0507143c59660303bda15cb62e SHA-256: 81b2f2bf41aa665a7de023a8d7c23a17e9f54ede45898573280712a8ba53a746
180 Risk Score

Malware Insights

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

The critical heuristic firings for RTF_EQUATION_EDITOR and CLAMAV_DETECTION indicate exploitation of CVE-2017-11882 via Microsoft Equation Editor. The RTF_OBJUPDATE heuristic suggests that the embedded OLE object is designed to be activated, likely leading to the execution of malicious code. This is a common method for delivering exploits via spearphishing attachments.

Heuristics 4

  • 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: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • \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_off0000003c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C 4159 bytes
SHA-256: c77e367b4e6d88a6e0dd34ce520c0725a1a9887c6be3dbda762ec1d50b122704

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