Malicious RTF — malware analysis report

Static analysis result for SHA-256 4c71fc8f7245ce6f…

MALICIOUS

RTF

50.9 KB
MD5: 7b68866d5a286b699c8e691cd32bde3f SHA-1: 858ead53dda2f7e949bd30b32edc6a67fab6971e SHA-256: 4c71fc8f7245ce6fd1c178ecdfa72abb6122ebd2836e3447707f973a39c85a1d
160 Risk Score

Malware Insights

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

The sample is an RTF document that contains an embedded OLE object. Static analysis identified critical heuristics indicating the presence of CVE-2017-11882, a vulnerability in Microsoft Equation Editor. This exploit allows for arbitrary code execution when the document is opened, likely delivered via spearphishing.

Heuristics 4

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • 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
  • 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_off0000010d.bin
53754bc87e3eaf197044d2336c442e0265b3dd512b0663cdcb4ab8419312e44b		 rtf-objdata-decoded RTF \objdata at offset 0x10D 3631 bytes

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