RTF / .DOC malware analysis — malicious · 9515857c3f2ac101

MALICIOUS

RTF / .DOC

301.1 KB

MD5: 29578654665a2d8ddf22749d0d696317 SHA-1: 27ed91bfb73bbb8c95b0b60bc96a11678857a32f SHA-256: 9515857c3f2ac101e9a54357dbd6b75cb16f4d303b5974e007bfaaefdf7f2226

222 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1204.001 Malicious Link T1566.001 Spearphishing Attachment T1059.003 Windows Command Shell

The file is an RTF document that leverages the CVE-2017-11882 vulnerability related to the Equation Editor OLE object. This exploit is known to download and execute a second-stage payload. The presence of OLE object data and specific RTF heuristics strongly indicate this attack vector. No document body text was available for analysis, but the exploit itself is sufficient to determine the attack pattern.

Heuristics 6

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.
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 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_off00001927.bin` `d85137eab5bbcbd3a3498d48689683864f07620cb5865e5da5ed7ecd375ec449`	rtf-objdata-decoded	RTF \objdata at offset 0x1927	100389 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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