Malicious RTF — malware analysis report

Static analysis result for SHA-256 209f9dede84e2c1a…

MALICIOUS

RTF

13.4 KB First seen: 2019-09-30
MD5: d03766100cfb00cf0a71a5ba4652af30 SHA-1: cefbb88d2c645b4620b484ac2fb273abe94bfe73 SHA-256: 209f9dede84e2c1a9c3019164b1543818ae61fcc65766ae330f89a689e7e5dbd
182 Risk Score

Malware Insights

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

The sample is an RTF document that contains embedded OLE object data and triggers the Equation Editor CLSID. This strongly indicates exploitation of CVE-2017-11882, a known vulnerability in Microsoft Equation Editor, which allows for arbitrary code execution. The document likely serves as a spearphishing attachment designed to exploit this vulnerability.

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000005e8.bin rtf-objdata-decoded RTF \objdata at offset 0x5E8 5039 bytes
SHA-256: 4ae238e164c0c9fe116cecd8ce625a9cacc5281434b3d7414b14f7022e66ebf8

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