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Research

Kaseya IOC

Fortify Security Team
Jul 3, 2021

Indicators of Compromise

agent.crt encoded dropper
2093c195b6c1fd6ab9e1110c13096c5fe130b75a84a27748007ae52d9e951643

agent.exe dropper
d55f983c994caa160ec63a59f6b4250fe67fb3e8c43a388aec60a4a6978e9f1e

Payloads
e2a24ab94f865caeacdf2c3ad015f31f23008ac6db8312c2cbfb32e4a5466ea2
8dd620d9aeb35960bb766458c8890ede987c33d239cf730f93fe49d90ae759dd

Additional recent REvil activity including dyad droppers and payloads with still valid stolen digital signatures:
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MITRE TTPs Used in Kaseya Attack

T1112 – Modify Registry
T1012 – Query Registry
T1082 – System Information Discovery
T1120 – Peripheral Device Discovery
T1491 – Defacement
T1543.003 – Create or Modify System Process: Windows Service
T1036 – Masquerading
T1036.003 – Masquerading: Rename System Utilities
T1202 – Indirect Command Execution
T1486 – Data Encrypted for Impact
T1106 – Native API

YARA Hunting Rules for REvil/Kaseya Artifacts

import "pe"
import "math"

rule cw_REvil_Kaseya_BUKTBAI_stolenCert
{
	meta:
		desc = "Stolen digital certificate: BUKTAI"
		author = "JAG-S @ SentinelLabs"
		last_modified = "07.02.2021"
		version = "1.0"
		hash = "d8353cfc5e696d3ae402c7c70565c1e7f31e49bcf74a6e12e5ab044f306b4b20"
		hash = "d5ce6f36a06b0dc8ce8e7e2c9a53e66094c2adfc93cfac61dd09efe9ac45a75f"
		hash = "df2d6ef0450660aaae62c429610b964949812df2da1c57646fc29aa51c3f031e"
		hash = "aae6e388e774180bc3eb96dad5d5bfefd63d0eb7124d68b6991701936801f1c7"
	condition:
		uint16(0) == 0x5a4d
		and
		for any signer in pe.signatures:
		(
			signer.subject == "/C=RU/L=Samara/O=BUKTBAI, OOO/CN=BUKTBAI, OOO"
			or
			signer.serial == "42:c1:64:9a:6b:80:64:0f:ad:7a:fb:b8:3e:29:81:52"
			or
			signer.thumbprint == "282ebc0a99a6328343a7d7706465778c3925adb6"
		)
}

rule cw_REvil_Kaseya_PB03TRANSPORT_stolenCert
{
	meta:
		desc = "Stolen digital certificate: PB03 TRANSPORT"
		author = "JAG-S @ SentinelLabs"
		last_modified = "07.02.2021"
		version = "1.0"
		hash = "8dd620d9aeb35960bb766458c8890ede987c33d239cf730f93fe49d90ae759dd"
		hash = "e2a24ab94f865caeacdf2c3ad015f31f23008ac6db8312c2cbfb32e4a5466ea2"
		hash = "d55f983c994caa160ec63a59f6b4250fe67fb3e8c43a388aec60a4a6978e9f1e"
	condition:
		uint16(0) == 0x5a4d
		and
		for any signer in pe.signatures:
		(
			signer.subject == "/C=CA/ST=Ontario/L=Brampton/O=PB03 TRANSPORT LTD./CN=PB03 TRANSPORT LTD."
			or
			signer.serial == "11:9a:ce:ad:66:8b:ad:57:a4:8b:4f:42:f2:94:f8:f0"
			or
			signer.thumbprint == "11ff68da43f0931e22002f1461136c662e623366"
		)
}

rule cw_REvil_Kaseya_SAYLENT_stolenCert
{
	meta:
		desc = "Stolen digital certificate: PB03 TRANSPORT"
		author = "JAG-S @ SentinelLabs"
		last_modified = "07.02.2021"
		version = "1.0"
		hash = "cc0cdc6a3d843e22c98170713abf1d6ae06e8b5e34ed06ac3159adafe85e3bd6"
		hash = "dc6b0e8c1e9c113f0364e1c8370060dee3fcbe25b667ddeca7623a95cd21411f"
	condition:
		uint16(0) == 0x5a4d
		and
		for any signer in pe.signatures:
		(
			signer.subject == "/C=RU/L=Cherepovetz/O=OOO Saylent/CN=OOO Saylent"
			or
			signer.serial == "00:bd:df:46:f3:a2:de:7d:2b:fb:f5:16:9a:e9:76:d9:7e"
			or
			signer.thumbprint == "0d61738e6407c01d5c9f477039fb581a5f81f436"
		)
}

rule cw_REvil_Kaseya_Dropper
{
	meta:
		desc = "Dropper for Microsoft Defender + Sodinokibi DLL Sideload"
		author = "JAG-S @ SentinelLabs"
		last_modified = "07.02.2021"
		version = "1.0"
		hash = "df2d6ef0450660aaae62c429610b964949812df2da1c57646fc29aa51c3f031e"
		hash = "dc6b0e8c1e9c113f0364e1c8370060dee3fcbe25b667ddeca7623a95cd21411f"
		hash = "aae6e388e774180bc3eb96dad5d5bfefd63d0eb7124d68b6991701936801f1c7"
		hash = "81d0c71f8b282076cd93fb6bb5bfd3932422d033109e2c92572fc49e4abc2471"
	strings:
		$drop_ransom = "mpsvc.dll" ascii wide fullword
		$drop_defender = "MsMpEng.exe" ascii wide fullword
		$drop_path = "C:\\Windows\\" wide fullword
	condition:
		uint16(0) == 0x5a4d
		and
		(
			2 of ($drop*) 
			and
			pe.number_of_resources == 2
			and
			for all rsrc in pe.resources:
				(
				math.entropy(rsrc.offset, rsrc.length) >= 6.7
				)
		)
}

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