RTF / .DOC malware analysis — malicious · e066b8e1f300576f

MALICIOUS

RTF / .DOC

369.2 KB

MD5: cfd518aa4df548f2d8782634cd0b6f5c SHA-1: be703ae2a2f98060535ff24a1c1909539993b594 SHA-256: e066b8e1f300576f3f401d940c283b451b6b874133a942660fe8c913e3a9bae0

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is an RTF document that leverages the CVE-2017-11882 vulnerability within the Equation Editor OLE object. This exploit is designed to decode and execute a Portable Executable (PE) payload, likely for further malicious actions. The high entropy of the decoded object and the critical heuristic firings strongly indicate the exploitation of this known vulnerability.

Heuristics 6

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
Decoded Equation Editor payload + PE critical RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
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_off00000057.bin` `5c7b4f1cfd69a03ea1064bb71a2b328820faf2e3e75bd91a89bf523ccb11168a`	rtf-objdata-decoded	RTF \objdata at offset 0x57	188914 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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