RTF malware analysis — malicious · b1d5be1850e6f547

MALICIOUS

RTF

9.6 KB First seen: 2018-11-05

MD5: 481152c2575346e7727153daa5108fa0 SHA-1: db8f91117f15c858b0458f756d1fc89b718820b9 SHA-256: b1d5be1850e6f547fad4258ce9caf4b411901ccb9a09ace8d71dbdcf04bf0f83

240 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 exploits the Microsoft Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for arbitrary code execution when the document is opened. The ClamAV detection name directly indicates the exploit used. The file is likely delivered as a spearphishing attachment.

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
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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000003a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3A	4535 bytes
SHA-256: `f38ad4722b7b2dc1d2cbdb3f0c4a8fa192ea8a060f57ae38945c570bda8279b6`

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