RTF / .DOC malware analysis — malicious · 8fae316bf8f8c4de

MALICIOUS

RTF / .DOC

830.1 KB

MD5: 44cda25d4bd91498afb391081e925d65 SHA-1: 3b04f2b38ab9f4850389e48551b71f8fcd1bbc15 SHA-256: 8fae316bf8f8c4de9d4faf0cf69df5a2fb668974577d5796a185a75ff3430acf

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.003 Windows Command Shell T1204.002 Malicious File

The RTF file contains an embedded OLE object that is automatically linked and updated, indicating an attempt to exploit vulnerabilities. Specifically, the RTF_EQUATION_EDITOR heuristic strongly suggests the use of the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for the execution of arbitrary code, likely to download and run a second-stage payload. The SHA256 hash is provided as a primary indicator.

Heuristics 5

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.
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_off00000047.bin` `c2183d2d30a717858673a092e5e5aa139637185adedcde48dfb4e1b15a7467fd`	rtf-objdata-decoded	RTF \objdata at offset 0x47	424851 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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