RTF malware analysis — malicious · bb81231efdf75b0f

MALICIOUS

RTF

8.2 KB First seen: 2018-05-18

MD5: 071f2110c17428610b9939531cf38a66 SHA-1: 770a14db847a47a4939d57c788daa8dd66a3ae3b SHA-256: bb81231efdf75b0f64689364168fcd542c347673a13da426282af05c5c652e82

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 exploits the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for arbitrary code execution when the object is activated. The ClamAV detection explicitly names this exploit, indicating a high likelihood of malicious intent.

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	4147 bytes
SHA-256: `cd2a3fcd925510a81f8965d36779682de8ea2c5f25ed64a8d7c5e4431cb660a7`

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