RTF / .DOC malware analysis — malicious · befc201977528c9d

MALICIOUS

RTF / .DOC

2.48 MB

MD5: 6549762fa17b89e3d22029d6b528d5ff SHA-1: 82b2cedda3978ec8f0e3e9797e388f88f93903f5 SHA-256: befc201977528c9d3362acfd8fecb519753e277d98a97273cb6a6cfbfafaf8c0

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains a decoded Equation Editor payload, indicating exploitation of CVE-2017-11882. The presence of OLE object data and excessive hex-encoded data suggests the embedding of a malicious executable. This payload is likely designed to download and execute a second-stage payload, as indicated by the RTF_OBJDATA and RTF_EQUATION_EDITOR heuristics.

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.
\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
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` `6ff4648be91e527359feeceff0ed5d418e2e80df6ce32de42468ca048fdb87d2`	rtf-objdata-decoded	RTF \objdata at offset 0x43	1298155 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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