395 lines
16 KiB
Text
395 lines
16 KiB
Text
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rule APT_MAL_CN_Wocao_Agent_Csharp {
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meta:
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description = "Strings from CSharp version of Agent"
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author = "Fox-IT SRT"
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reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
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id = "e5212226-a82d-558d-abb4-43ad7848764e"
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strings:
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$a = "mysend(client_sock, new byte[] { 0x16, 0x00 }, 2);" ascii wide
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$b = "Dns.GetHostAddresses(sip.Remove(sip.Length - 1));" ascii wide
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$c = "Port = 256 * buf[4] + buf[5];" ascii wide
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$d = "Port = 256 * buf[AddrLen] + buf[AddrLen + 1];" ascii wide
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$e = "StartTransData(CliSock" ascii wide
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$f = "static void ForwardTransmit(object ft_data)" ascii wide
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$key = "0x4c, 0x1b, 0x68, 0x0b, 0x6a, 0x18, 0x09, 0x41, 0x5a, 0x36, 0x1f, 0x56, 0x26, 0x2a, 0x03, 0x44, 0x7d, 0x5f, 0x03, 0x7b, 0x07, 0x6e, 0x03, 0x77, 0x30, 0x70, 0x52, 0x42, 0x53, 0x67, 0x0a, 0x2a" ascii wide
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$key_raw = { 4c1b680b6a1809415a361f56262a03447d5f037b076e03773070524253670a2a }
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condition:
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1 of them
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}
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rule APT_MAL_CN_Wocao_agent_powershell_dropper {
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meta:
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description = "Strings from PowerShell dropper of CSharp version of Agent"
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author = "Fox-IT SRT"
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reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
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id = "833ce607-56a9-5580-bbd1-e72392945fec"
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strings:
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$a = "function format([string]$source)"
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$b = "foreach($c in $bb){$tt = $tt + [char]($c -bxor"
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$c = "[agent]::Main($args);"
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condition:
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1 of them
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}
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rule APT_MAL_CN_Wocao_agent_powershell_b64encoded {
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meta:
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description = "Piece of Base64 encoded data from Agent CSharp version"
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author = "Fox-IT SRT"
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reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
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id = "14e1702d-6229-5989-8bb7-cc9c0c321676"
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strings:
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$header = "LFNVT0hBBnVfVVJDSx0sU1VPSEEGdV9VUkNLCG9pHSxTVU9IQQZ1X1VSQ0sIZUlK"
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condition:
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all of them
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}
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rule APT_MAL_CN_Wocao_agent_py {
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meta:
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description = "Strings from Python version of Agent"
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author = "Fox-IT SRT"
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reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
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id = "ca30dd6a-b596-54ab-b4f0-50e6b1382f73"
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strings:
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$a = "vpshex.decode"
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$b = "self._newsock.recv"
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$c = "Rsock.connect"
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$d = /MAX_DATALEN\s?=\s?10240/
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$e = /LISTEN_MAXCOUNT\s?=\s?80/
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$f = "ListenSock.listen(LISTEN_MAXCOUNT)"
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$g = "nextsock.send(head)"
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$h = "elif transnode"
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$i = "infobuf[4:6]"
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$key = "L\\x1bh\\x0bj\\x18\\tAZ6\\x1fV&*\\x03D}_\\x03{\\x07n\\x03w0pRBSg\\n*"
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condition:
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1 of them
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}
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rule APT_MAL_CN_Wocao_agent_py_b64encoded {
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meta:
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description = "Piece of Base64 encoded data from Agent Python version"
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author = "Fox-IT SRT"
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reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
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id = "eb2701e9-4358-5d24-bfcd-b4dde24f13bf"
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strings:
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$header = "QlpoOTFBWSZTWWDdHjgABDTfgHwQe////z/v/9+////6YA4cGPsAl2e8M9LSU128"
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condition:
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all of them
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}
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rule APT_MAL_CN_Wocao_keylogger_py {
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meta:
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description = "Strings from Python keylogger"
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author = "Fox-IT SRT"
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reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
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id = "f7b5ec1b-669e-5e7d-a9d3-011d212eb363"
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strings:
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$a = "c:\\windows\\temp\\tap.tmp"
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$b = "c:\\windows\\temp\\mrteeh.tmp"
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$c = "GenFileName"
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$d = "outfile"
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$e = "[PASTE:%d]"
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condition:
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3 of them
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}
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rule APT_MAL_CN_Wocao_keylogger_file {
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meta:
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description = "Rule for finding keylogger output files"
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author = "Fox-IT SRT"
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reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
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id = "22e866b3-4b02-593a-b9a6-aa86870b6509"
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strings:
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$a = { 0d 0a 20 [3-10] 53 74 61 72 74 75 70 3a 20 [3] 20 [3] 20 [2] 20 [2] 3a [2] 3a [2] 20 }
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condition:
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all of them
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}
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rule APT_MAL_CN_Wocao_xserver_csharp {
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meta:
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description = "Strings from the CSharp version of XServer"
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author = "Fox-IT SRT"
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reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
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id = "48f4c88d-fb56-54ca-84e2-38f88804a50f"
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strings:
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$a = "static void ServerX(int ListenPort)" ascii wide
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$b = "public class xserver" ascii wide
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$c = "[xserver]::Main($args);" ascii wide
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$d = "add rule name=powershell dir=in localport=47000 action=allow" ascii wide
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$e = "string TempFile = file_path + \".CT\";" ascii wide
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$f = "Port = 256 * RecvBuf[AddrLen + 5] + RecvBuf[AddrLen + 6];"
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$g = "CliSock.Send(new byte[] { 0x05, 0x00 });"
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condition:
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1 of them
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}
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rule APT_MAL_CN_Wocao_xserver_powershell_b64encoded {
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meta:
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description = "Piece of Base64 encoded data from the XServer PowerShell dropper"
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author = "Fox-IT SRT"
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reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
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id = "01e38cfb-b245-5398-b037-6d1d2fb726ee"
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strings:
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$header_47000 = "5T39c9u2kr/nr2A0Ny2VKIzkfLRJntuJHafPN/nwWG777rUZDy3BNq8UqSEpx26b"
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$header_25667 = "5T1rc9u2st/zKxjNmZZKFEZyErdJ6nZsx+nxnTjxWGp77mkzHlqCbd5SpIak/Gjr"
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condition:
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any of them
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}
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rule APT_MAL_CN_Wocao_xserver_powershell_dropper {
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meta:
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description = "Strings from the PowerShell dropper of XServer"
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author = "Fox-IT SRT"
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reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
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id = "97169ab4-d68d-5137-83de-d9cac975747e"
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strings:
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$encfile = "New-Object IO.Compression.DeflateStream([IO.MemoryStream][Convert]::FromBase64String($encfile)"
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condition:
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all of them
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}
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rule APT_MAL_CN_Wocao_injector_bin {
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meta:
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description = "Process injector/launcher"
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author = "Fox-IT SRT"
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reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
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id = "389279f1-6531-594f-97b6-5adbc8fa4d3d"
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strings:
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$a = "%s{%04d-%02d%02d-%02d%02d-%d%ld}.tmp"
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$b = "s% > s% c/ exe.d"
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$c = {
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48 89 5C 24 08 48 89 74 24 10 57 48 83 EC 50 48
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8B 71 08 48 8D 59 10 48 8B F9 48 8B CB FF 17 33
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C9 48 8D 47 78 48 89 44 24 48 4C 8D 87 9C 03 00
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00 48 89 5C 24 40 48 8D 97 90 00 00 00 4C 89 44
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24 38 45 33 C9 48 89 4C 24 30 45 33 C0 89 4C 24
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28 C7 44 24 20 01 00 00 00 66 89 4B 40 FF D6 48
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8B 5C 24 60 33 C0 48 8B 74 24 68 48 83 C4 50 5F
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C3
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}
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condition:
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1 of them
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}
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rule APT_MAL_CN_Wocao_timeliner_bin {
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meta:
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description = "Timeliner utility"
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author = "Fox-IT SRT"
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reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
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id = "3d81a4ae-0ce0-5867-ac93-a706556481b6"
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strings:
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$a = "[+] Work completed." ascii wide
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$b = "[-] Create a new file failed." ascii wide
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$c = "[-] This is not a correct path." ascii wide
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$d = "%s [TargetPath] <Num> <SavePath>" ascii wide
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$e = "D\t%ld\t%ld\t%ld\t%d\t%d\t%s\t" ascii wide
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$f = "D\t%ld\t%ld\t%ld\t-1\t%d\t%s\t" ascii wide
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$g = "%s\t%ld\t%ld\t%ld\t%I64d\t%d\t%s\t%s" ascii wide
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condition:
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1 of them
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}
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rule APT_MAL_CN_Wocao_checkadmin_bin {
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meta:
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description = "Checkadmin utility"
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author = "Fox-IT SRT"
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reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
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id = "2f819213-ade1-525b-af18-d77b7fc96093"
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strings:
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$a = "[-] %s * A system error has occurred: %d" ascii wide
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$b = {
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0D 00 0A 00 25 00 6C 00 64 00 20 00 72 00 65 00
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73 00 75 00 6C 00 74 00 73 00 2E 00 0D 00 0A 00
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}
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$c = "%s\t<Access denied>" ascii wide
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condition:
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1 of them
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}
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rule APT_MAL_CN_Wocao_getos_py {
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meta:
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description = "Python getos utility"
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author = "Fox-IT SRT"
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reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
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id = "4a731dde-87e4-566a-b559-d23e0bef5841"
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strings:
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$smb_1 = {
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00 00 00 85 ff 53 4d 42 72 00 00 00 00 18 53 c8
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff fe
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00 00 ff b4 00 62 00 02 50 43 20 4e 45 54 57 4f
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52 4b 20 50 52 4f 47 52 41 4d 20 31 2e 30 00 02
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4c 41 4e 4d 41 4e 31 2e 30 00 02 57 69 6e 64 6f
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77 73 20 66 6f 72 20 57 6f 72 6b 67 72 6f 75 70
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73 20 33 2e 31 61 00 02 4c 4d 31 2e 32 58 30 30
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32 00 02 4c 41 4e 4d 41 4e 32 2e 31 00 02 4e 54
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20 4c 4d 20 30 2e 31 32 00
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}
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$smb_2 = {
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00 00 00 c8 ff 53 4d 42 73 00 00 00 00 18 03 c8
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff fe
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00 00 3f b5 0c ff 00 c8 00 04 11 32 00 00 00 00
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00 00 00 28 00 00 00 00 00 d4 00 00 a0 8d 00 4e
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54 4c 4d 53 53 50 00 01 00 00 00 07 82 88 a2 00
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00 00 00 28 00 00 00 00 00 00 00 28 00 00 00 05
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01 28 0a 00 00 00 0f 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00
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}
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$smbstr_1 = "\\x00\\x00\\x00\\x85\\xffSMBr\\x00\\x00\\x00\\x00\\x18S\\xc8\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\xff\\xfe\\x00\\x00\\xff\\xb4\\x00b\\x00\\x02PC NETWORK PROGRAM 1.0\\x00\\x02LANMAN1.0\\x00\\x02Windows for Workgroups 3.1a\\x00\\x02LM1.2X002\\x00\\x02LANMAN2.1\\x00\\x02NT LM 0.12\\x00"
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$smbstr_2 = "\\x00\\x00\\x00\\xc8\\xffSMBs\\x00\\x00\\x00\\x00\\x18\\x03\\xc8\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\xff\\xfe\\x00\\x00?\\xb5\\x0c\\xff\\x00\\xc8\\x00\\x04\\x112\\x00\\x00\\x00\\x00\\x00\\x00\\x00(\\x00\\x00\\x00\\x00\\x00\\xd4\\x00\\x00\\xa0\\x8d\\x00NTLMSSP\\x00\\x01\\x00\\x00\\x00\\x07\\x82\\x88\\xa2\\x00\\x00\\x00\\x00(\\x00\\x00\\x00\\x00\\x00\\x00\\x00(\\x00\\x00\\x00\\x05\\x01(\\n\\x00\\x00\\x00\\x0f\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00"
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$code_1 = "return 'Other error.'" ascii wide
|
||
|
|
$code_2 = "sblob = buf[47:47 + sbl]" ascii wide
|
||
|
|
$code_3 = "re.split('[\\x00-,]+', y[-4])" ascii wide
|
||
|
|
$code_4 = "('').join(sblob[off:off + hlen].split('\\x00'))" ascii wide
|
||
|
|
$code_5 = "banner = '%s %s' % (hostname, native)" ascii wide
|
||
|
|
$code_6 = "banner = '%s\\\\%s %s' % (dm, hostname, native)" ascii wide
|
||
|
|
|
||
|
|
$tsk_1 = "PushTask" ascii wide
|
||
|
|
$tsk_2 = "parse_task" ascii wide
|
||
|
|
$tsk_3 = "commit_task" ascii wide
|
||
|
|
|
||
|
|
$str_1 = "Usage: getos.py <ip-range|ip-file>" ascii wide
|
||
|
|
$str_2 = "The path '%s' write fails." ascii wide
|
||
|
|
$str_3 = "Receive a signal %d," ascii wide
|
||
|
|
$str_4 = "Scan Complete!" ascii wide
|
||
|
|
$str_5 = "line: %d, %s: %s" ascii wide
|
||
|
|
$str_6 = "Other error." ascii wide
|
||
|
|
|
||
|
|
condition:
|
||
|
|
(all of ($smb_*)) or
|
||
|
|
(all of ($smbstr_*)) or
|
||
|
|
(3 of ($code_*)) or
|
||
|
|
(all of ($tsk_*)) or
|
||
|
|
(3 of ($str_*))
|
||
|
|
}
|
||
|
|
|
||
|
|
rule APT_MAL_CN_Wocao_info_vbs {
|
||
|
|
meta:
|
||
|
|
description = "Strings from the information grabber VBS"
|
||
|
|
author = "Fox-IT SRT"
|
||
|
|
reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
|
||
|
|
|
||
|
|
id = "b719fb31-2836-5faf-a7c8-c361a14df2be"
|
||
|
|
strings:
|
||
|
|
$ = "Logger PingConnect"
|
||
|
|
$ = "Logger GetAdmins"
|
||
|
|
$ = "Logger InstallPro"
|
||
|
|
$ = "Logger Exec"
|
||
|
|
$ = "retstr = adminsName & \" Members\" & vbCrLf & _"
|
||
|
|
$ = "Logger VolumeName & \" (\" & objDrive.DriveLetter & \":)\" _"
|
||
|
|
$ = "txtRes = txtRes & machine & \" can"
|
||
|
|
$ = "retstr = \"PID SID Image Name\" & vbCrLf & \"===="
|
||
|
|
|
||
|
|
condition:
|
||
|
|
4 of them
|
||
|
|
}
|
||
|
|
|
||
|
|
rule APT_MAL_CN_Wocao_webshell_console_jsp {
|
||
|
|
meta:
|
||
|
|
description = "Strings from the console.jsp webshell"
|
||
|
|
author = "Fox-IT SRT"
|
||
|
|
reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
|
||
|
|
|
||
|
|
id = "1afdfc34-d2e3-58c7-80ea-ee5632e42469"
|
||
|
|
strings:
|
||
|
|
$a = "String strLogo = request.getParameter(\"image\")"
|
||
|
|
$b = "!strLogo.equals(\"web.gif\")"
|
||
|
|
$c = "<font color=red>Save Failed!</font>"
|
||
|
|
$d = "<font color=red>Save Success!</font>"
|
||
|
|
$e = "Save path:<br><input type=text"
|
||
|
|
$f = "if (newfile.exists() && newfile.length()>0) { out.println"
|
||
|
|
|
||
|
|
condition:
|
||
|
|
1 of them
|
||
|
|
}
|
||
|
|
|
||
|
|
rule APT_MAL_CN_Wocao_webshell_index_jsp {
|
||
|
|
meta:
|
||
|
|
description = "Strings from the index.jsp socket tunnel"
|
||
|
|
author = "Fox-IT SRT"
|
||
|
|
reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
|
||
|
|
|
||
|
|
id = "9c226ccd-6c69-523c-bca4-371e55274667"
|
||
|
|
strings:
|
||
|
|
$x1 = "X-CMD"
|
||
|
|
$x2 = "X-STATUS"
|
||
|
|
$x3 = "X-TARGET"
|
||
|
|
$x4 = "X-ERROR"
|
||
|
|
$a = "out.print(\"All seems fine.\");"
|
||
|
|
|
||
|
|
condition:
|
||
|
|
all of ($x*) and $a
|
||
|
|
}
|
||
|
|
|
||
|
|
rule APT_MAL_CN_Wocao_webshell_ver_jsp {
|
||
|
|
meta:
|
||
|
|
description = "Strings from the ver.jsp webshell"
|
||
|
|
author = "Fox-IT SRT"
|
||
|
|
reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
|
||
|
|
|
||
|
|
id = "b2828b84-8934-5111-9345-683a07025070"
|
||
|
|
strings:
|
||
|
|
$a = "String strLogo = request.getParameter(\"id\")"
|
||
|
|
$b = "!strLogo.equals(\"256\")"
|
||
|
|
$c = "boolean chkos = msg.startsWith"
|
||
|
|
$d = "while((c = er.read()) != -1)"
|
||
|
|
$e = "out.print((char)c);}in.close()"
|
||
|
|
$f = "out.print((char)c);}er.close()"
|
||
|
|
|
||
|
|
condition:
|
||
|
|
1 of them
|
||
|
|
}
|
||
|
|
|
||
|
|
rule APT_MAL_CN_Wocao_webshell_webinfo {
|
||
|
|
meta:
|
||
|
|
description = "Generic strings from webinfo.war webshells"
|
||
|
|
author = "Fox-IT SRT"
|
||
|
|
reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
|
||
|
|
|
||
|
|
id = "b8477f62-f3f6-5526-b0e3-9b794fefaa1f"
|
||
|
|
strings:
|
||
|
|
$var1 = "String strLogo = request.getParameter"
|
||
|
|
$var2 = "String content = request.getParameter(\"content\");"
|
||
|
|
$var3 = "String basePath=request.getScheme()"
|
||
|
|
$var4 = "!strLogo.equals("
|
||
|
|
$var5 = "if(path!=null && !path.equals(\"\") && content!=null"
|
||
|
|
$var6 = "File newfile=new File(path);"
|
||
|
|
|
||
|
|
$str1 = "Save Success!"
|
||
|
|
$str2 = "Save Failed!"
|
||
|
|
|
||
|
|
condition:
|
||
|
|
2 of ($var*) or (all of ($str*) and 1 of ($var*))
|
||
|
|
}
|