RTF / .DOC malware analysis — malicious · f45d2efc6e407a17

MALICIOUS

RTF / .DOC

1.96 MB

MD5: 92ec9bb34778f7f1da2bde62166d14df SHA-1: 04805e8ec6f94832eac9a36f56edaf6fa07cd1c9 SHA-256: f45d2efc6e407a17cbe129622fddf8a26e108d39f5fd05a164525d95ad8a3218

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document containing an embedded OLE object that decodes to a PE file, strongly indicating exploitation of the Equation Editor vulnerability (CVE-2017-11882). The presence of a large, hex-encoded OLE object and the 'RTF_EQUATION_EDITOR' heuristic confirm this. The decoded artifact, objdata_00_off00001b8d.bin, is the primary IOC. The document body is heavily obfuscated and does not provide clear user-facing content, but the technical indicators point to a classic exploit delivery mechanism.

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 ~2044KB 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_off00001b8d.bin` `056d24cc46c627af202a890e1cc9b35acd037b44e63c0300db12d9f5258f7ad2`	rtf-objdata-decoded	RTF \objdata at offset 0x1B8D	1022530 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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