RTF / .DOC malware analysis — malicious · cdcd1a030137fd6f

MALICIOUS

RTF / .DOC

1.85 MB

MD5: 51947d2c268dfb661f7acaa6b108cf22 SHA-1: 95ca541ba418fd2d9be97835ea2c9f8a239d1d87 SHA-256: cdcd1a030137fd6f2f2f546c1f87310f13ec161a9d6c652b12b786e7dc09c63a

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution: Malicious File

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). Static analysis indicates that this object contains a decoded PE file, suggesting it's designed to execute a secondary payload. The excessive hex data and automatic linking further support the exploitation of this known vulnerability for delivering malware.

Heuristics 6

Decoded Equation Editor payload + PE critical RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
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 ~1933KB 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_off00000b66.bin` `455fe98fce5f745c5dd28b179732df6dd81651ac7971b8f403f4f019a9a12a26`	rtf-objdata-decoded	RTF \objdata at offset 0xB66	966815 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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