RTF malware analysis — malicious · 7365bb0200b6943f

MALICIOUS

RTF

8.2 KB First seen: 2018-05-18

MD5: f19269728f7ac3b6860c6ba3a04b3efa SHA-1: d483c53ee79218b936adc104c92efd7a7d934a80 SHA-256: 7365bb0200b6943ffa17387d29674ce3ea65d840667cec186513c67ecff69362

220 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an RTF document containing an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This exploit allows for arbitrary code execution upon opening the document, typically delivered via spearphishing. The ClamAV detection explicitly names the CVE, confirming the exploitation method.

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
Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
\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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000003c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3C	4157 bytes
SHA-256: `4ba7c794a5ef4d4fbd44c2374b9e510c01bcc53b793ae49d5954c46d71e52f60`

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