RTF malware analysis — malicious · 1ac84b7838ac54f8

MALICIOUS

RTF

8.2 KB First seen: 2018-07-08

MD5: 404df0946b673e36e964ada3c286b34e SHA-1: 7f17fdd6a75b01d83adac90ef7c3b2384c64e1be SHA-256: 1ac84b7838ac54f853ab9f3c6566675702704403030f9df7838caa0734765a17

220 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains heuristics indicating the exploitation of the Equation Editor vulnerability (CVE-2017-11882). This exploit is known to facilitate arbitrary code execution, typically used to download and run a second-stage malware. The ClamAV signature directly confirms this exploit.

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	4156 bytes
SHA-256: `12ffecadfcf80e98190c2ad032f280da423f20304c66763031da956320093bb7`

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