Malicious RTF — malware analysis report

Static analysis result for SHA-256 99d09895db1ea3b5…

MALICIOUS

RTF

260.5 KB Created: 2021-02-12 04:30:00
MD5: d70b5003f392c718f09fd4ec33c36f38 SHA-1: a44bcf3451f76420d7c591e5bb90036ef35b3c3f SHA-256: 99d09895db1ea3b5e0f873ee6294b57071c5728795330505220babc8bd5bdcdb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document that contains an embedded OLE object. Static analysis identified a critical vulnerability, CVE-2017-11882, related to the Microsoft Equation Editor, which is commonly exploited to achieve arbitrary code execution. The document body appears to be a list of schools, likely a lure to disguise the malicious intent.

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.
  • 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
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000fe.bin
2f745dd298c0777bb95294fe0a2c8f240eec5861f0cc93b3512954d0a18e34a4		 rtf-objdata-decoded RTF \objdata at offset 0xFE 2877 bytes

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