RTF / .DOC malware analysis — malicious · 26f2fe76267c7703

MALICIOUS

RTF / .DOC

3.54 MB

MD5: 50de7ad9fea730317508010b2925c031 SHA-1: f300b41d2615117627c8ef0365300bee0cd4cccc SHA-256: 26f2fe76267c7703e8fb768d9e5f8afacb6a209445f7cf9912cff69d451a8708

262 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of exploitation, specifically related to the Equation Editor vulnerability (CVE-2017-11882). The presence of OLE object data, excessive hex-encoded data, and a composite moniker strongly suggest that the file is designed to trigger code execution. ClamAV also explicitly detects this as Rtf.Exploit.CVE_2017_11882-6584355-1, confirming the exploit attempt.

Heuristics 7

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 ~3716KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 2 \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_off0000009a.bin` `f77e445deb35d454d764dc886421abe4f77a7e7c0c122c8f818786793da12de2`	rtf-objdata-decoded	RTF \objdata at offset 0x9A	1858137 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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