RTF / .DOC malware analysis — malicious · e1c09e3ed04823f7

MALICIOUS

RTF / .DOC

2.48 MB

MD5: 96b86368be1e7498628432386c28c97f SHA-1: 8400a3362a67c9b30daaf7e12f7bc779b902f5f8 SHA-256: e1c09e3ed04823f7a5307ae130f9c5259eae64aa5d37576818aefd766bec13e8

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object, specifically decoded from the Equation Editor. This indicates an exploit targeting the Equation Editor vulnerability (CVE-2017-11882). The excessive hex data and the suspicious extracted artifact suggest that the object data is used to hide and deliver a malicious payload, likely a PE file, which is then executed.

Heuristics 6

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 ~2596KB 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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off00000043.bin` `aefc6f8837ac3f359171bb990b2a43c115f4f039d482f7e41cf8b29969bdecfa`	rtf-objdata-decoded	RTF \objdata at offset 0x43	1298150 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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