RTF malware analysis — malicious · 99f9c77fe6ad58e0

MALICIOUS

RTF

312.2 KB

MD5: b1d5bc999209f14fba7f3115f3015ffe SHA-1: 3a3cba004a6cb6156625f9cdaec446375bae3880 SHA-256: 99f9c77fe6ad58e0e057a0b0f1f1b60eaa021844b814c49ed3bdae6475026d03

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains OLE object data and specifically triggers heuristics related to the Equation Editor vulnerability (CVE-2017-11882). This indicates the file is designed to exploit this known vulnerability to execute arbitrary code. The embedded OLE object, objdata_00_off0000177b.bin, is likely the malicious payload or a component thereof. No document body text or scripts were extracted, but the critical heuristic firings strongly suggest an exploit delivery mechanism.

Heuristics 4

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 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_off0000177b.bin` `4d02584db48e5e379bfaa1418628f234bd75b20ad65aee19ea4517f7f6548da9`	rtf-objdata-decoded	RTF \objdata at offset 0x177B	156707 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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