RTF malware analysis — malicious · f5a965faa9849eda

MALICIOUS

RTF

8.2 KB First seen: 2019-05-31

MD5: e4a0753f9807c6ae58f16860a4887b53 SHA-1: 13441a4ffe14af6ff5c2c66479146d0e7aa69139 SHA-256: f5a965faa9849eda33d39460d96f4b0c88be17fea28f8fb576e359797c538bc0

180 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that leverages the Equation Editor, a known vector for exploiting vulnerabilities. The ".bin" artifact extracted from the OLE object data is flagged as a shellcode candidate, indicating it likely contains and executes the malicious payload. This technique is commonly used in spearphishing attachments to deliver malware.

Heuristics 5

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
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 medium 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_off00000036.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x36	4148 bytes
SHA-256: `04dfc6837460391f25b61e51da20108526b262609233cc2f6e20b9763d8fb560`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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