RTF / .DOC malware analysis — malicious · 47e22fb0ffa32cd1

MALICIOUS

RTF / .DOC

1.57 MB

MD5: e02e3888ac2cfbb869f9e34a2707985c SHA-1: 25a53664157b25ac595e4faebc34c0dab98c5853 SHA-256: 47e22fb0ffa32cd1522a518baa3929cd94d8fab7cce218d911bf474f9a25c76d

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains OLE object data, specifically a decoded Equation Editor payload. This indicates an attempt to exploit a known vulnerability, likely CVE-2017-11882, to execute arbitrary code. The excessive hex-encoded data within the object further suggests the presence of a hidden payload. The file's structure and heuristic firings strongly point to a malicious document designed for exploitation.

Heuristics 5

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.
\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 ~1648KB 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_off00000076.bin` `4b8275356b1ce51de2b23a58cc06c51d1049224482d15db6613c0f212686c611`	rtf-objdata-decoded	RTF \objdata at offset 0x76	824107 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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