RTF / .DOC malware analysis — malicious · 39097a208fc44653

MALICIOUS

RTF / .DOC

277.2 KB

MD5: e3f457534edc7ecb4ea5b415b3e8c928 SHA-1: e536cd6314ddefaf4510e41453047639b502570e SHA-256: 39097a208fc44653546ca6f01bd6af471c01b045da19c6f54cdf97d03cfc6c77

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an OLE object with data that decodes to a PE file, specifically targeting the Equation Editor vulnerability. This indicates the document is designed to exploit this known vulnerability to download and execute a secondary payload. The presence of an automatically linked OLE object and an objupdate directive further supports the exploitation of the Equation Editor. The extracted artifact 'objdata_00_off00000068.bin' is the decoded payload.

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.
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_off00000068.bin` `fca60c439d12edda7c7558604ea58fc55b613c7103ee0e6d8ad703e68baee24d`	rtf-objdata-decoded	RTF \objdata at offset 0x68	141802 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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