Malicious RTF — malware analysis report

Static analysis result for SHA-256 dea46d0c8c7f2d68…

MALICIOUS

RTF

56.0 KB
MD5: 0b5994444e787492e47889a102e616e0 SHA-1: ca05ab6037880dc2e4e7823b2667beeac78f5478 SHA-256: dea46d0c8c7f2d682355284538b4adfd98f6c55f90c5c566adb5bf437bb49cb8
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, likely to download and run a secondary payload. The presence of the Equation Editor CLSID and the specific CVE firing strongly indicate exploitation for client execution.

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_off0000010a.bin
5c5092a0b07a33690decb803288a2c098c2a65335babee2887069196902a4c6b		 rtf-objdata-decoded RTF \objdata at offset 0x10A 3631 bytes

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