RTF malware analysis — malicious · 922cbfc95c1b5588

MALICIOUS

RTF

7.2 KB First seen: 2019-05-31

MD5: f780d1e30346070165d35f936e19d4a2 SHA-1: 38de890d5df9ceacb719bf1efedfbb6009f89ab0 SHA-256: 922cbfc95c1b55881584aac6e494a9bdc1431803e0c27f0437e6b8806caca286

260 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains an embedded OLE object. Heuristics indicate a critical vulnerability related to CVE-2017-11882 in the Equation Editor, which is a common method for exploiting client execution. The presence of shellcode candidate regions further supports this. The file is likely delivered as a spearphishing attachment to exploit this vulnerability.

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-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
\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_off00000032.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x32	3643 bytes
SHA-256: `817c947abfb893b5570e4f407226bf538ab5789ce955a65de2ef60f12e8d21bb`
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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