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YARA · Avast / Gen Digital IOC

AVASTTI_Cobaltstrike_Raw_Payload_Https_Stager_X86_Utf16

No description has been set in the source file - AvastTI

Hack toolCobalt StrikeAvast / Gen Digital IOCDetection Rule License 1.1Compiles with YARA-X
Author
Gen Threat Labs
Date
2021-07-08
Modified
2026-03-11
Score / Quality
75 / 90

What this rule detects

No description has been set in the source file - AvastTI

Associated malware family: Cobalt Strike.

It defines 1 patterns (0 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
cobaltstrike-raw-payload-https-stager-x86-utf16.yarDetection Rule License 1.1
rule AVASTTI_Cobaltstrike_Raw_Payload_Https_Stager_X86_Utf16
{
	meta:
		description = "No description has been set in the source file - AvastTI"
		author = "Gen Threat Labs"
		id = "dcd3e5c8-7626-5a78-9f90-7a8e67311d90"
		date = "2021-07-08"
		modified = "2026-03-11"
		reference = "https://github.com/gendigitalinc/ioc"
		source_url = "https://github.com/avast/ioc/blob/a450ddabed95984422909c75ac52b6841f685983/CobaltStrike/yara_rules/cs_rules.yar#L499-L520"
		license_url = "N/A"
		logic_hash = "5003ebd545182bb105cdcaaac2105a92cdd99a0178c24eb5ae2888232897aeb5"
		score = 75
		quality = 90
		tags = ""

	strings:
		$h01 = { FC 00 E8 00 89 00 00 00 00 00 00 00 60 00 89 00 E5 00 31 00 D2 00 64 00 8B 00 52 00 30 00 8B 00 52 00 0C 00 8B 00 52 00 14 00 8B 00 72 00 28 }

	condition:
		uint32( @h01 + 0x013b ) == 0x07002600 and uint32( @h01 + 0x0161 ) == 0xa7007900 and uint32( @h01 + 0x0199 ) == 0xc6009f00 and uint32( @h01 + 0x01d1 ) == 0x3b002e00 and uint32( @h01 + 0x0203 ) == 0x86009e00 and uint32( @h01 + 0x0223 ) == 0x7b001800 and uint32( @h01 + 0x0255 ) == 0x5d00e200 and uint32( @h01 + 0x0267 ) == 0x31005e00 and uint32( @h01 + 0x0285 ) == 0x0b00e000 and uint32( @h01 + 0x05d5 ) == 0x5600a200 and uint32( @h01 + 0x05fd ) == 0xe5005300 and uint32( @h01 + 0x0633 ) == 0xe2008900
}

Strings (1 patterns)

IdentifierTypeValueModifiers
$h01hex{ FC 00 E8 00 89 00 00 00 00 00 00 00 60 00 89 00 E5 00 31 00 D2 00 64 00 8B 00 52 00 30 00 8B 00 52 00 0C 00 8B 00 52 00 14 00 8B 00 72 00 28 }

Condition

uint32( @h01 + 0x013b ) == 0x07002600 and uint32( @h01 + 0x0161 ) == 0xa7007900 and uint32( @h01 + 0x0199 ) == 0xc6009f00 and uint32( @h01 + 0x01d1 ) == 0x3b002e00 and uint32( @h01 + 0x0203 ) == 0x86009e00 and uint32( @h01 + 0x0223 ) == 0x7b001800 and uint32( @h01 + 0x0255 ) == 0x5d00e200 and uint32( @h01 + 0x0267 ) == 0x31005e00 and uint32( @h01 + 0x0285 ) == 0x0b00e000 and uint32( @h01 + 0x05d5 ) == 0x5600a200 and uint32( @h01 + 0x05fd ) == 0xe5005300 and uint32( @h01 + 0x0633 ) == 0xe2008900

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References

Licence & attribution

Author: Gen Threat Labs

Source repository: Avast / Gen Digital IOC @ a450ddabed

Licence: Detection Rule License 1.1 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: dcd3e5c8-7626-5a78-9f90-7a8e67311d90

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