RTF malware analysis — malicious · b1bcce0f6a052247

MALICIOUS

RTF

43.8 KB Created: 2020-12-23 15:44:00 First seen: 2020-12-28

MD5: faece33a86156aeeb3f2cd417987941a SHA-1: 0fd3e8bfaff34efb85ebb6047a89d2ce184e7158 SHA-256: b1bcce0f6a052247119b9e1060943160637221a53e16091895954e5ddffd60ac

202 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object and triggers critical heuristics for Equation Editor and CVE-2017-8759 exploitation. This indicates the file is designed to exploit a vulnerability in MSXML SAX OLE to execute embedded shellcode. The presence of OLE object data further supports the execution of malicious content. The benign URL found is not relevant to the malicious functionality.

Heuristics 6

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
CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
Suspicious extracted artifact high 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.
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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000001eb.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1EB	3568 bytes
SHA-256: `0be1df45768f27a29d80dd58e88e24f6ac89f32104906cacd8f9facfab8b283c`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): powershell.exe -noexit -windowstyle maximized

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