RTF / .DOC malware analysis — malicious · f1e94c7469579f62

MALICIOUS

RTF / .DOC

7.34 MB

MD5: f1fe7847998a282dbd88ab3912960379 SHA-1: f0c8ac4b888665eadf2ca39baeba8d41edf12128 SHA-256: f1e94c7469579f62f19283a17d16bce573c9a34b5259d3c641dbbc30de672b93

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an OLE object with an automatically linked Equation Editor, indicating an attempt to exploit the CVE-2017-11882 vulnerability. The large amount of hex-encoded data within the OLE object suggests it is used to hide a malicious payload. The file's SHA256 hash is provided as a primary IOC.

Heuristics 6

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~7697KB of hex-encoded data inside \objdata sections — may hide a payload
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_off00000063.bin` `858bdf5ee948d5f86e4f7fb2ae8e1b265d7cea060bd20618cf1b3a56d5365e67`	rtf-objdata-decoded	RTF \objdata at offset 0x63	3848695 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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