RTF / .DOC malware analysis — malicious · a2c018c5d0da80a4

MALICIOUS

RTF / .DOC

1.85 MB

MD5: 26d6f5d60fa55c8f8db5751b32b2e474 SHA-1: 7e3e7f55ba3547fada728e502f088b4a0b41683d SHA-256: a2c018c5d0da80a4d508af3e41f28cb5f3a4e942e2b94b3e81f12a808eccc859

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object that is automatically linked and updated, indicating an attempt to execute embedded content. Critical heuristics confirm that this object decodes to a PE file, specifically targeting the Equation Editor vulnerability. The large amount of hex-encoded data within the OLE object further suggests it's hiding a payload. The extracted artifact 'objdata_00_off00000b42.bin' is the likely dropped payload.

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.
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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1934KB 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
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_off00000b42.bin` `db5e2b6e2ba5ce51ed3730b6df6583aa6e9503d054a5ec13d9fdc9d82d4df193`	rtf-objdata-decoded	RTF \objdata at offset 0xB42	967220 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.