Malicious RTF — malware analysis report

Static analysis result for SHA-256 dffbdd5586848381…

MALICIOUS

RTF

52.2 KB
MD5: 55264dbe2352d28e5a7056262acb2527 SHA-1: f1c1ad6347975c0d68957aea447e616aef60ff84 SHA-256: dffbdd5586848381d22cf7d76806c871c89108cffc7c64df6867128c360215ef
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an embedded OLE object that leverages a known vulnerability in Microsoft Equation Editor (CVE-2017-11882). This vulnerability allows for arbitrary code execution when the object is processed. The critical heuristic firings strongly indicate this exploit is present and likely intended to deliver a malicious payload.

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_off00000107.bin
e71abb7605a91e8e61ab76b1413b3010fbff00972b43391d0d6687e6f5d99a84		 rtf-objdata-decoded RTF \objdata at offset 0x107 3631 bytes

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