RTF / .DOC malware analysis — malicious · b4864dbe00fc76a3

MALICIOUS

RTF / .DOC

3.94 MB

MD5: 2c209e62acdc6a2dd9c5538fa525ebd4 SHA-1: 1094a80521b9bc347311c3b1b94ea3e3ab980231 SHA-256: b4864dbe00fc76a3f3f7d2b57ca52a0c3a83b10601121d06271666cb5307e3ee

302 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document containing a critical Equation Editor vulnerability exploit (CVE-2017-11882). The presence of OLE object data and excessive hex-encoded data strongly suggests that the document is designed to embed and execute a secondary payload. The ClamAV detection confirms the malicious nature of the exploit.

Heuristics 8

Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
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 ~4128KB 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_off00000060.bin` `29d671158a0b32dd960c9ea68cd6cb07c0b963090cef6f9a5cfd24907580905c`	rtf-objdata-decoded	RTF \objdata at offset 0x60	2064458 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.

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