RTF / .DOC malware analysis — malicious · 40234330ea86f2d0

MALICIOUS

RTF / .DOC

317.5 KB

MD5: 7458565123d50ae044f0ea971c83906f SHA-1: 2db7d85d417cc5440eb0677e57f4dfe560930dbf SHA-256: 40234330ea86f2d0308bc6212561a7ec592b8ff220b61dda819d540078df7372

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-11882) to execute arbitrary code. The presence of OLE object data and automatic linking further indicates an exploit attempt. The ClamAV signature directly identifies the CVE-2017-11882 exploit, confirming the attack vector. No specific malware family could be identified, but the exploit's nature suggests it's used as a downloader for a secondary payload.

Heuristics 6

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.
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_off00001004.bin` `53aaf610c8d81901af7bfd7ef32aac21e79e9b78753b724ff737d916f6956882`	rtf-objdata-decoded	RTF \objdata at offset 0x1004	160343 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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