RTF malware analysis — malicious · adf5de107a394c39

MALICIOUS

RTF

7.1 KB First seen: 2018-06-19

MD5: 011ba3ffd0f013289f08368920a3a61a SHA-1: 694341ce58f5be16e53d1d7fe80cdc194d26b3da SHA-256: adf5de107a394c39b69109657ae366c1d3ab770722f91a818ef72c957e376ac4

220 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The presence of ".objupdate" and the specific CLSID for Equation Editor strongly indicate an exploit attempt. This technique is commonly used to deliver malicious payloads via spearphishing attachments.

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	3626 bytes
SHA-256: `cc6a6050332d6159e9d2e7660b7757901591af18f38c5d3d91d3c69a260793a5`

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