NetWalker ransomware group operates by the threat actor known as "CIRCUS SPIDER". The NetWalker ransomware was discovered in 2019. The group mainly targeting the Asia Pacific region but can attack globally. The group uses common attacking tools like Mimikatz and other legitimate tools (LOLBINS) like PSTools, AnyDesk, TeamViewer, NLBrute, and more. The group knowing by targeting the healthcare sector. Finally, in January 2021, Netwalker was takedown by the authorities, the police have confiscated hundreds of thousands of dollars in ransom payments collected by the Netwalker group, and they seized servers and disrupted the infrastructure and the darknet websites of the Netwalker ransomware group.
| Title | Available | Last Visit | FQDN | Screenshot |
|---|---|---|---|---|
| None | 🔴 | 2021-05-01 00:00:00.000000 | rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion | N/A |
| Discovery | RMM Tools | Defense Evasion | Credential Theft | OffSec | Networking | LOLBAS | Exfiltration |
|---|---|---|---|---|---|---|---|
| AdFind | Mimikatz | Cobalt Strike | PsExec | ||||
| ProcDump |
This information is provided by Ransomware-Tool-Matrix
| Employees(s) | Customer(s) | Third Party Employee(s) |
|---|---|---|
This information is provided by HudsonRock
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import "pe"
rule netwalker_ransomware
{
meta:
description = "Rule to detect Netwalker ransomware"
author = "McAfee ATR Team"
date = "2020-03-30"
rule_version = "v1"
malware_type = "ransomware"
reference = "https://www.ccn-cert.cni.es/comunicacion-eventos/comunicados-ccn-cert/9802-publicado-un-informe-de-codigo-danino-sobre-netwalker.html"
note = "The rule doesn't detect the samples packed with UPX"
strings:
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$pattern3 = { CCCCCCCCCC558B??FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68????????FF??????????FF??????????68??????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}
condition:
uint16(0) == 0x5a4d and
any of ($pattern*)
}
rule netwalker_signed {
meta:
description = "Rule to detect Netwalker ransomware digitally signed."
author = "Marc Rivero | McAfee ATR Team"
reference = "https://www.ccn-cert.cni.es/comunicacion-eventos/comunicados-ccn-cert/9802-publicado-un-informe-de-codigo-danino-sobre-netwalker.html"
date = "2020-03-30"
note = "The rule will hit also some Dridex samples digitally signed"
condition:
uint16(0) == 0x5a4d and
for any i in (0 .. pe.number_of_signatures) : (
pe.signatures[i].subject contains "/CN=EWBTCAXQKUMDTHCXCZ" and
pe.signatures[i].serial == "17:16:bb:93:fb:a9:a2:41:ba:a8:2e:c7:5e:ff:0c" or
pe.signatures[i].thumbprint == "a4:28:e9:4a:61:3a:1f:cf:ff:08:bf:e7:61:51:64:31:1a:6f:87:bc")
}
rule Netwalker {
meta:
description = "Rule based on code overlap in RagnarLocker ransomware"
author = "McAfee ATR team"
date = "2020-06-14"
rule_version = "v1"
malware_type = "ransomware"
actor_group = "Unknown"
strings:
$0 = {C88BF28B4330F76F3803C88B434813F2F76F2003C88B433813F2F76F3003C88B434013F2F76F2803C88B432813F2F76F4003C8894D6813F289756C8B4338F76F388BC88BF28B4328F76F4803C88B434813F2F76F2803C88B433013F2F76F400FA4CE}
$1 = {89542414895424108BEA8BDA8BFA423C22747C3C5C75588A023C5C744F3C2F744B3C2274473C6275078D5702B008EB3F3C6675078D5302B00CEB343C6E75078D5502B00AEB293C72750B8B542410B00D83C202EB1A3C74750B8B542414B00983C2}
$2 = {C8894D7013F28975748B4338F76F408BC88BF28B4340F76F3803C88B433013F2F76F4803C88B434813F2F76F3003C8894D7813F289757C8B4348F76F388BC88BF28B4338F76F4803C88B434013F2F76F400FA4CE}
$3 = {C07439473C2F75E380FB2A74DEEB2D8D4ABF8D422080F9190FB6D80FB6C28AD60F47D88AC6042080EA410FB6C880FA190FB6C60F47C83ACB754B46478A1684D2}
$4 = {8B433013F2F76F0803C88B432013F2F76F1803C88B0313F2F76F3803C88B430813F2F76F3003C88B433813F2F72F03C8894D3813F289753C8B4338F76F088BC8}
$5 = {F73101320E32213234329832E3320C332D334733643383339133A833BD33053463347C34543564358335AE36C3362937E9379A39BA390A3A203A443A183B2B3B}
$6 = {8B431813F2F76F4803C88B432813F2F76F3803C88B434013F2F76F200FA4CE0103C903C88B432013F2F76F4003C88B433013F2F76F3003C8894D6013F2897564}
condition:
uint16(0) == 0x5A4D and
uint32(uint32(0x3C)) == 0x00004550 and
all of them
}
rule win_netwalker_reflective_dll_injection_decoded {
meta:
description = "Rule to detect Reflective DLL Injection Powershell Script dropping Netwalker, after hexadecimal decoded and xor decrypted "
author = "McAfee ATR Team"
date = "2020-05-28"
rule_version = "v1"
malware_type = "ransomware"
reference = "https://blog.trendmicro.com/trendlabs-security-intelligence/netwalker-fileless-ransomware-injected-via-reflective-loading/ | https://news.sophos.com/en-us/2020/05/27/netwalker-ransomware-tools-give-insight-into-threat-actor/"
hash = "fd29001b8b635e6c51270788bab7af0bb5adba6917c278b93161cfc2bc7bd6ae"
strings:
// API addresses of the functions the script needs from kernel32.dll
$api0 = { 5b 44 6c 6c 49 6d 70 6f 72 74 28 22 6b 65 72 6e 65 6c 33 32 2e 64 6c 6c 22 2c 53 65 74 4c 61 73 74 45 72 72 6f 72 20 3d 20 74 72 75 65 2c 20 45 6e 74 72 79 50 6f 69 6e 74 20 3d 20 22 56 69 72 74 75 61 6c 41 6c 6c 6f 63 22 29 5d }
// [DllImport("kernel32.dll",SetLastError = true, EntryPoint = "VirtualAlloc")]
$api1 = { 5b 44 6c 6c 49 6d 70 6f 72 74 28 22 6b 65 72 6e 65 6c 33 32 2e 64 6c 6c 22 2c 53 65 74 4c 61 73 74 45 72 72 6f 72 20 3d 20 74 72 75 65 2c 45 6e 74 72 79 50 6f 69 6e 74 20 3d 20 22 47 65 74 50 72 6f 63 41 64 64 72 65 73 73 22 29 5d }
// [DllImport("kernel32.dll",SetLastError = true,EntryPoint = "GetProcAddress")]
$api2 = { 5b 44 6c 6c 49 6d 70 6f 72 74 28 22 6b 65 72 6e 65 6c 33 32 2e 64 6c 6c 22 2c 53 65 74 4c 61 73 74 45 72 72 6f 72 20 3d 20 74 72 75 65 2c 45 6e 74 72 79 50 6f 69 6e 74 20 3d 20 22 4c 6f 61 64 4c 69 62 72 61 72 79 41 22 29 5d }
// [DllImport("kernel32.dll",SetLastError = true,EntryPoint = "LoadLibraryA")]
$api3 = { 5b 44 6c 6c 49 6d 70 6f 72 74 28 22 6b 65 72 6e 65 6c 33 32 2e 64 6c 6c 22 2c 53 65 74 4c 61 73 74 45 72 72 6f 72 20 3d 20 74 72 75 65 2c 45 6e 74 72 79 50 6f 69 6e 74 20 3d 20 22 57 72 69 74 65 50 72 6f 63 65 73 73 4d 65 6d 6f 72 79 22 29 5d }
// [DllImport("kernel32.dll",SetLastError = true,EntryPoint = "WriteProcessMemory")]
$api4 = { 5b 44 6c 6c 49 6d 70 6f 72 74 28 22 6b 65 72 6e 65 6c 33 32 2e 64 6c 6c 22 2c 53 65 74 4c 61 73 74 45 72 72 6f 72 20 3d 20 74 72 75 65 2c 45 6e 74 72 79 50 6f 69 6e 74 20 3d 20 22 56 69 72 74 75 61 6c 46 72 65 65 22 29 5d }
// [DllImport("kernel32.dll",SetLastError = true,EntryPoint = "VirtualFree")]
$api5 = { 5b 44 6c 6c 49 6d 70 6f 72 74 28 22 6b 65 72 6e 65 6c 33 32 2e 64 6c 6c 22 2c 53 65 74 4c 61 73 74 45 72 72 6f 72 20 3d 20 74 72 75 65 2c 45 6e 74 72 79 50 6f 69 6e 74 20 3d 20 22 47 65 74 43 75 72 72 65 6e 74 50 72 6f 63 65 73 73 22 29 5d }
// [DllImport("kernel32.dll",SetLastError = true,EntryPoint = "GetCurrentProcess")]
$api6 = { 5b 44 6c 6c 49 6d 70 6f 72 74 28 22 6b 65 72 6e 65 6c 33 32 2e 64 6c 6c 22 2c 53 65 74 4c 61 73 74 45 72 72 6f 72 20 3d 20 74 72 75 65 2c 45 6e 74 72 79 50 6f 69 6e 74 20 3d 20 22 43 6c 6f 73 65 48 61 6e 64 6c 65 22 29 5d }
// [DllImport("kernel32.dll",SetLastError = true,EntryPoint = "CloseHandle")]
$api7 = { 5b 44 6c 6c 49 6d 70 6f 72 74 28 22 6b 65 72 6e 65 6c 33 32 2e 64 6c 6c 22 2c 20 53 65 74 4c 61 73 74 45 72 72 6f 72 3d 74 72 75 65 2c 45 6e 74 72 79 50 6f 69 6e 74 20 3d 20 22 56 69 72 74 75 61 6c 41 6c 6c 6f 63 45 78 22 29 5d }
// [DllImport("kernel32.dll", SetLastError=true,EntryPoint = "VirtualAllocEx")]
$api8 = { 5b 44 6c 6c 49 6d 70 6f 72 74 28 22 6b 65 72 6e 65 6c 33 32 2e 64 6c 6c 22 2c 20 53 65 74 4c 61 73 74 45 72 72 6f 72 3d 74 72 75 65 2c 45 6e 74 72 79 50 6f 69 6e 74 20 3d 20 22 56 69 72 74 75 61 6c 50 72 6f 74 65 63 74 45 78 22 29 5d }
// [DllImport("kernel32.dll", SetLastError=true,EntryPoint = "VirtualProtectEx")]
$api9 = { 5b 44 6c 6c 49 6d 70 6f 72 74 28 22 6b 65 72 6e 65 6c 33 32 2e 64 6c 6c 22 2c 20 53 65 74 4c 61 73 74 45 72 72 6f 72 20 3d 20 74 72 75 65 2c 45 6e 74 72 79 50 6f 69 6e 74 20 3d 20 22 4f 70 65 6e 50 72 6f 63 65 73 73 22 29 5d }
// [DllImport("kernel32.dll", SetLastError = true,EntryPoint = "OpenProcess")]
$api10 = { 5b 44 6c 6c 49 6d 70 6f 72 74 28 22 6b 65 72 6e 65 6c 33 32 2e 64 6c 6c 22 2c 45 6e 74 72 79 50 6f 69 6e 74 20 3d 20 22 43 72 65 61 74 65 52 65 6d 6f 74 65 54 68 72 65 61 64 22 29 5d }
// [DllImport("kernel32.dll",EntryPoint = "CreateRemoteThread")]
// Other Artifacts
$artifact0 = { 5b 44 6c 6c 49 6d 70 6f 72 74 28 22 6b 65 72 6e 65 6c 33 32 2e 64 6c 6c 22 2c 45 6e 74 72 79 50 6f 69 6e 74 20 3d 20 22 43 72 65 61 74 65 52 65 6d 6f 74 65 54 68 72 65 61 64 22 29 5d }
// Get-WmiObject Win32_Shadowcopy | ForEach-Object {$_.Delete();} | Out-Null
$artifact1 = { 53 79 73 74 65 6d 2e 52 75 6e 74 69 6d 65 2e 49 6e 74 65 72 6f 70 53 65 72 76 69 63 65 73 2e 4d 61 72 73 68 61 6c 5d 3a 3a 50 74 72 54 6f 53 74 72 75 63 74 75 72 65 }
// System.Runtime.InteropServices.Marshal]::PtrToStructure
$artifact2 = { 53 79 73 74 65 6d 2e 52 75 6e 74 69 6d 65 2e 49 6e 74 65 72 6f 70 53 65 72 76 69 63 65 73 2e 4d 61 72 73 68 61 6c 5d 3a 3a 52 65 61 64 49 6e 74 31 36 }
// System.Runtime.InteropServices.Marshal]::ReadInt16
$artifact3 = { 65 6e 76 3a 57 49 4e 44 49 52 5c 73 79 73 77 6f 77 36 34 5c 77 69 6e 64 6f 77 73 70 6f 77 65 72 73 68 65 6c 6c 5c 76 31 2e 30 5c 70 6f 77 65 72 73 68 65 6c 6c 2e 65 78 65 22 20 2d 4e 6f 6e 49 6e 74 65 72 61 63 74 69 76 65 20 2d 4e 6f 50 72 6f 66 69 6c 65 20 2d 65 78 65 63 20 62 79 70 61 73 73}
// env:WINDIR\syswow64\windowspowershell\v1.0\powershell.exe" -NonInteractive -NoProfile -exec bypass
$artifact4 = { 65 6e 76 3a 57 49 4e 44 49 52 5c 73 79 73 77 6f 77 36 34 5c 77 69 6e 64 6f 77 73 70 6f 77 65 72 73 68 65 6c 6c 5c 76 31 2e 30 5c 70 6f 77 65 72 73 68 65 6c 6c 2e 65 78 65 22 20 2d 4e 6f 6e 49 6e 74 65 72 61 63 74 69 76 65 20 2d 4e 6f 50 72 6f 66 69 6c 65 20 2d 65 78 65 63 20 62 79 70 61 73 73 20 2d 66 69 6c 65}
// env:WINDIR\syswow64\windowspowershell\v1.0\powershell.exe" -NonInteractive -NoProfile -exec bypass -file
$artifact5 = {5b 50 61 72 61 6d 65 74 65 72 28 50 6f 73 69 74 69 6f 6e 20 3d 20 30 20 2c 20 4d 61 6e 64 61 74 6f 72 79}
// [Parameter(Position = 0 , Mandatory
$artifact6 = {5b 50 61 72 61 6d 65 74 65 72 28 50 6f 73 69 74 69 6f 6e 20 3d 20 31 20 2c 20 4d 61 6e 64 61 74 6f 72 79}
// [Parameter(Position = 1 , Mandatory
$artifact7 = {2d 45 78 65 63 75 74 69 6f 6e 50 6f 6c 69 63 79 20 42 79 50 61 73 73 20 2d 4e 6f 4c 6f 67 6f 20 2d 4e 6f 6e 49 6e 74 65 72 61 63 74 69 76 65 20 2d 4e 6f 50 72 6f 66 69 6c 65 20 2d 4e 6f 45 78 69 74}
// -ExecutionPolicy ByPass -NoLogo -NonInteractive -NoProfile -NoExit
$artifact8 = {72 65 74 75 72 6e 20 5b 42 69 74 43 6f 6e 76 65 72 74 65 72 5d 3a 3a 54 6f 49 6e 74 36 34}
// return [BitConverter]::ToInt64
condition:
6 of ($api*) or
(
(3 of ($artifact*))
)
}