RTF / .DOC malware analysis — malicious · c13e055514856038

MALICIOUS

RTF / .DOC

313.2 KB

MD5: 391e41af1897f013f9acc489c97c2d68 SHA-1: f3211eae81a457f8e6e45ebb48f512eb20db1968 SHA-256: c13e055514856038e4bb3183f7383eb40c9c6314ec787e13f1b40111776b137f

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1204.001 Malicious Link

The sample is an RTF document that leverages the Equation Editor vulnerability (RTF_EQUATION_EDITOR). It contains OLE object data and an automatic link that triggers the OLE activation, leading to the execution of a decoded PE file. This indicates a delivery mechanism designed to exploit a known vulnerability for initial access and payload execution.

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_off00001769.bin` `eed1c159386bbda3da70ae6594449072b2cef6df369192d73643d2fad898fd04`	rtf-objdata-decoded	RTF \objdata at offset 0x1769	157276 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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