RTF / .DOC malware analysis — malicious · a51aad6097aa1f5f

MALICIOUS

RTF / .DOC

1.55 MB

MD5: 7e478136a1f65e898b0acceb991c9125 SHA-1: f6896aca338d9c1c3be63101e251cb01f8e428d6 SHA-256: a51aad6097aa1f5f75d727fc668da3c0cba5ee7ef59f1929ad5bfc80e51aeec1

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object with excessive hex-encoded data, strongly indicating a hidden payload. The presence of RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics points to exploitation of the Equation Editor vulnerability (CVE-2017-11882) for arbitrary code execution. This mechanism is commonly used to download and execute further malicious stages. The large amount of data within the objdata section suggests the embedded payload is substantial.

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.
\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 ~1625KB 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_off00000043.bin` `e6e3ecc3455b0c9700a43b17f64e01f1cf4a947fcafbe6f12196b65dba31f160`	rtf-objdata-decoded	RTF \objdata at offset 0x43	812817 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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