Malicious RTF — malware analysis report

Static analysis result for SHA-256 20546d2646a0e54e…

MALICIOUS

RTF

67.2 KB
MD5: 4d26f8cde212a7331db31923481a070a SHA-1: 9db3da238634ee03033e255ef164e21266a23791 SHA-256: 20546d2646a0e54e03934b8003bd59f5ca754984578204979e6ae27c63e82702
160 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that leverages a known vulnerability in the Equation Editor (CVE-2017-11882). This vulnerability allows for the execution of arbitrary code upon opening the document, likely to download and execute a secondary payload. No document body or scripts were extracted, but the critical heuristic firings strongly indicate exploitation.

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_off00000110.bin
5ccd98db9a81f219287471bf2df082a2b1ffb572bd3d7351dada9e34e1ad8a40		 rtf-objdata-decoded RTF \objdata at offset 0x110 3631 bytes

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