RTF malware analysis — malicious · e455a4b97df04aae

MALICIOUS

RTF

114.8 KB First seen: 2018-05-18

MD5: 0d35b9490a879a2a88cd0807e1f5f705 SHA-1: 566f7ddb646f23231be99b7cb95fedcb287ef8fe SHA-256: e455a4b97df04aae6df0f66561660d1d92de0bde346870d4b5c360003a49b4f0

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 leverages the Equation Editor vulnerability (CVE-2017-11882). The document body explicitly instructs the user to enable editing, indicating a lure to bypass security measures. This exploit allows for client-side code execution, likely to download and run a secondary payload.

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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000087.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x87	34482 bytes
SHA-256: `df63b18a64f6378a95bd83064939a6e3d6dedb17d690fa4b79913bef603c99aa`

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