RTF malware analysis — malicious · 66e5988459e142af

MALICIOUS

RTF

15.6 KB First seen: 2019-08-04

MD5: b81761c2f45486b50f457f16f803d798 SHA-1: 74b7f227472d1bd308eab1a2d3dc5c03f4fdde1e SHA-256: 66e5988459e142af12568f97f4af6597e3a7a0c4bc393e01d66176afa3c9a6ce

220 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an RTF document containing embedded OLE object data, specifically triggering heuristics related to Equation Editor vulnerabilities (CVE-2017-11882). The presence of ` tf_objupdate` and `rtf_ole10native_stream` further indicates an attempt to activate embedded content. ClamAV detection confirms this as a known exploit targeting Equation Editor, commonly used to deliver secondary payloads.

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_off00001a10.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1A10	4665 bytes
SHA-256: `42639ba52c3e5faccf519bec597a14ca434ca9510710907c3382764996987712`

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