RTF / .DOC malware analysis — malicious · cb6b115332651373

MALICIOUS

RTF / .DOC

305.2 KB

MD5: 230dabf84d0340ea0dd504415a2eebdc SHA-1: cee1a5db9a0ee4bd295f74fb2db2f230989853a7 SHA-256: cb6b115332651373029e83cbed3e8342707b4559a43fc38de7a1e8d59b4d5911

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is known to be used for delivering second-stage payloads. The heuristic firings strongly indicate the exploitation of this vulnerability, leading to the decoding of a PE file. No specific family could be identified, but the attack pattern is consistent with exploit-based document delivery.

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_off00000047.bin` `47f7efd9e16923778ce7856eb0476c7e6a8bd3f09da9761e5d6a51d447bbfb5a`	rtf-objdata-decoded	RTF \objdata at offset 0x47	156154 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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