RTF / .DOC malware analysis — malicious · ea117459989bdd69

MALICIOUS

RTF / .DOC

315.6 KB

MD5: 8e250240c949866ca46b1d69ce99f14e SHA-1: a0d0a69bb5f4c474c5c0d31ba02dd47e0b1870de SHA-256: ea117459989bdd69d8df6ffdcc12cc7b0165ff43b43e0ebc8ff5a261ac5cca76

222 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is an RTF document that leverages the CVE-2017-11882 vulnerability in the Equation Editor. This vulnerability is known to be used for delivering various types of malware. The presence of OLE object data and automatic linking further indicates an attempt to execute embedded content. While no specific payload URL or script was directly extracted, the exploit itself is the primary indicator of malicious intent, aiming to download and execute a secondary stage.

Heuristics 6

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
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000984.bin` `312291fec42d7a2472e47a6dd64bc57a4f58c948f097c72bb25139c2be4b919e`	rtf-objdata-decoded	RTF \objdata at offset 0x984	64056 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.93, consistent with packed or encrypted content.

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