RTF malware analysis — malicious · 80a26f20c4e34e92

MALICIOUS

RTF

13.4 KB First seen: 2018-11-20

MD5: 79b1bc7a7998beb76734114bc0846777 SHA-1: 24274e259368e180dcda7827d3568839c1dd695c SHA-256: 80a26f20c4e34e9268d782071b0795c26159d5482e14aea91fab38b52712f8c8

220 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 leverages the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for arbitrary code execution, which is typically used to download and run a second-stage malware payload. The ClamAV detection explicitly names 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_off000008e4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8E4	5645 bytes
SHA-256: `af79384f7fe1af0717355e846d7389b2c2b6bb2c0e9c4602ce94817f3575aa9f`

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