RTF malware analysis — malicious · 13b69b916c34b1fc

MALICIOUS

RTF

9.2 KB First seen: 2018-08-14

MD5: 21dc3f70ba0500a8645d0b003289a2ba SHA-1: 6cc580bbbdf51216f2efd98742cd5e476959aa49 SHA-256: 13b69b916c34b1fcf89e67612655c792655cfad6e038bf5738a5a11029aff9d1

220 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and specifically triggers heuristics related to the Equation Editor vulnerability (CVE-2017-11882). This indicates the file is designed to exploit this vulnerability for client-side code execution. The ClamAV detection name further confirms this specific exploit. Given the nature of the exploit, it is highly likely to have been delivered as a spearphishing attachment.

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_off0000003a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3A	4656 bytes
SHA-256: `2fb790e9c0db47ff630b0b971a9fd998c371003451ed34d9739a8d9608e02ade`

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