29 lines
1.1 KiB
Text
29 lines
1.1 KiB
Text
import "pe"
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rule Mal_Win32_Onyx_Strain_Chaos_Ransomware_2022
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{
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meta:
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description = "Detects Onyx Ransomware build off of Chaos Builder v4"
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reference = "https://blogs.blackberry.com/en/2022/05/yashma-ransomware-tracing-the-chaos-family-tree"
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author = "BlackBerry Threat Research"
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date = "2022-05-10"
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license = "This Yara rule is provided under the Apache License 2.0 (https://www.apache.org/licenses/LICENSE-2.0) and open to any user or organization, as long as you use it under this license and ensure originator credit in any derivative to The BlackBerry Research & Intelligence Team"
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strings:
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$s1 = "(?:[13]{1}[a-km-zA-HJ-NP-Z1-9]{26,33}|bc1[a-z0-9]{39,59})" wide
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$s2 = "All of your files are currently encrypted by ONYX strain." wide
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$s3 = "Inform your supervisors and stay calm!" wide
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condition:
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//PE File
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uint16(0) == 0x5a4d and
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//Directories
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pe.data_directories[pe.IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR].size != 0 and
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//All strings
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all of ($s*)
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}
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