RTF malware analysis — malicious · f21f6b8f92923f51

MALICIOUS

RTF

434.1 KB

MD5: ced3e71d4d8b97f2fe5457bf9c8e10ae SHA-1: 9e59892f98dec482b6405620023b95bd52463c34 SHA-256: f21f6b8f92923f51bf458589c99f4a6c412f690c0545695cbe652ad2bfca78d8

202 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1559.001 Component Object Model Hijacking T1059.001 PowerShell

The RTF file contains embedded OLE object data, specifically related to Equation Editor, and triggers an \objupdate directive. This strongly indicates exploitation of CVE-2017-11882. The decoded OLE object is a large, high-entropy MZ executable, suggesting it serves as a second-stage payload. No document body text was available for analysis, but the heuristics clearly point to a known exploit for initial access.

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.
Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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 2 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off00001430.bin` `bfc1e0ac9e427688ac47c99327533ec8ef9f8b9d9dd265ede426f5f0e24a79cd`	rtf-objdata-decoded	RTF \objdata at offset 0x1430	219441 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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