RTF / .DOC malware analysis — malicious · 3aa4e025334bf046

MALICIOUS

RTF / .DOC

310.3 KB

MD5: bbad2a7f356ad4056dd19020b1054e57 SHA-1: e198a4b759023bfe98926c9689fee9ccdc849b77 SHA-256: 3aa4e025334bf046fc081743e11b2706827f2f50dbe50d43909c63d3de90edfa

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.001 Malicious Link T1059.003 Command and Scripting Interpreter: Windows Command Shell T1105 Ingress Tool Transfer

The file is an RTF document containing an embedded OLE object that decodes to a PE file, indicating a likely exploit. The RTF_EQUATION_EDITOR heuristic specifically points to a vulnerability in the Equation Editor component. The RTF_OBJUPDATE heuristic suggests that the OLE object is designed to be activated automatically, leading to the execution of the decoded payload. This payload is likely a downloader, as suggested by the Ingress Tool Transfer MITRE technique.

Heuristics 4

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.
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_off00000dc5.bin` `3adf4a8ba37882c1a741f1262fccf18f5b1ff34ec30e8bba9eab64ffee66c653`	rtf-objdata-decoded	RTF \objdata at offset 0xDC5	156905 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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