RTF / .DOC malware analysis — malicious · 35231afbb0b164d0

MALICIOUS

RTF / .DOC

1.85 MB

MD5: 74d2967a43da048b9479f279a09782d3 SHA-1: 23fe70cfb68eb480054ae4de86abe71166996889 SHA-256: 35231afbb0b164d084e8ee4c26f74e5223e8ff86e97301a4d19de5db2d9449cf

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains OLE object data and triggers heuristics indicating the use of the Equation Editor exploit. The excessive hex data and the decoded PE artifact suggest that the file is designed to download and execute a second-stage payload. The specific nature of the payload is not immediately clear from the static analysis, but the exploit vector is evident.

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 ~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_off000005df.bin` `f4e347b08e77bf56435096aecea821dea332ef6d5715f32660b158b0e1e594ef`	rtf-objdata-decoded	RTF \objdata at offset 0x5DF	967334 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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