RTF / .DOC malware analysis — malicious · 2068d34ab1d61d86

MALICIOUS

RTF / .DOC

313.4 KB

MD5: ba14656c71af910a882306bf6daa2133 SHA-1: e50e29da9d2e48c051ab6176d4c0d1e2283b3f2b SHA-256: 2068d34ab1d61d86c973bc5d8cca5578f20a20fe2bf3f4b272dad5dd1f59ece6

142 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 critical RTF_EQUATION_EDITOR heuristic firing strongly indicates this exploit. The RTF_OBJDATA and RTF_OBJEMB heuristics suggest the presence of embedded OLE objects, which are commonly used to deliver malicious payloads in such exploits. The RTF_OBJUPDATE heuristic indicates that the embedded object is designed to be activated automatically. No document body or script content was available for further analysis, but the exploit vector is clear.

Heuristics 5

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
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_off00001d39.bin` `24599dd12ceb63326f39321dff215db726db6b0cd0261a8d921f23a5de7b45ae`	rtf-objdata-decoded	RTF \objdata at offset 0x1D39	156515 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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