RTF / .DOC malware analysis — malicious · 4d17876e06a91de8

MALICIOUS

RTF / .DOC

1.59 MB

MD5: 53ccddd37dd9e42881e907ab2b91e619 SHA-1: d044b3b5e0c29130fdd3e039d4b4c67fb6095265 SHA-256: 4d17876e06a91de8d2f4dfac36fa8e6a2a09eb6921aae796fa5dbe845aad21fd

282 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor vulnerability (CVE-2017-11882). This is strongly indicated by multiple critical and high-severity heuristics, including 'RTF_EQUATION_EDITOR' and 'CLAMAV_DETECTION' which explicitly names the CVE. The excessive hex data within the OLE object suggests it's used to hide the malicious payload. The primary attack vector is likely a spearphishing attachment, leading to the execution 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
\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 ~1657KB 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_off000015ed.bin` `e4530a59401bd55c3ea4dfb087ce8b971fc4553327b817d93050266d65826b41`	rtf-objdata-decoded	RTF \objdata at offset 0x15ED	828996 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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