RTF / .DOC malware analysis — malicious · 4795808afc11d193

MALICIOUS

RTF / .DOC

181.4 KB

MD5: b00cb4f474c0fb80d2c8507e0bd53d2c SHA-1: 59fc43558d07ccf720a195b9e531da7c28fdec02 SHA-256: 4795808afc11d1932068e0a28ce7e91c511500b3ebf00645cafc6ab6abcfdefd

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The RTF document contains an OLE object with a decoded native payload, strongly indicating exploitation of CVE-2017-11882. The presence of RTF_OBJDATA and RTF_OBJUPDATE heuristics further supports the malicious nature of the embedded object, which is designed to execute arbitrary code. No document body or script content was available for analysis, but the exploit itself is sufficient to classify the attack pattern.

Heuristics 5

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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_off00000699.bin` `d68582bb89a80ffa91e85fa421d3f1329b14bdcb21b47ca99664335d73d835f4`	rtf-objdata-decoded	RTF \objdata at offset 0x699	61278 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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