RTF / .DOC malware analysis — malicious · ef33a5e2f3332e03

MALICIOUS

RTF / .DOC

257.5 KB

MD5: 190e79d5da2328c7731b48c3840ce90e SHA-1: f1232d3efdbe14afd15caff6c2ac0c6cc256945b SHA-256: ef33a5e2f3332e03957e09429bf02ac1438bf83661d7243b31732cf09ff8b8f2

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The presence of `RTF_EQUATION_EDITOR` and `RTF_OBJAUTLINK` heuristics strongly indicates exploitation of this known vulnerability. The `RTF_OBJUPDATE` heuristic suggests that the embedded object is designed to be activated automatically, leading to the execution of malicious code. The `EXTRACTED_FILE_STATIC_TRIAGE` heuristic further supports this by flagging a suspicious carved artifact, likely the payload dropped by the exploit.

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` `79e115b8f9fc836f820ccefb6a1632603c8bf0fcd81d2cac9c5bd3701139b2d1`	rtf-objdata-decoded	RTF \objdata at offset 0x47	131701 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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