quasar | c6d8cde7cd9d0731356ae426c5b6d3d7a8ab05143fa78d257af9b9d037be7b49

Analysis

max time kernel
143s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20250129-en
resource tags

arch:x64arch:x86image:win10v2004-20250129-enlocale:en-usos:windows10-2004-x64system
submitted
05-02-2025 12:52

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General

Target

BT.exe
Size

3.2MB
MD5

a2f9781e42a8da5eb3cbe8a4dba009e6
SHA1

61baaae3da49b0985fa32e6ef9c6ca7a422e0eb4
SHA256

c6d8cde7cd9d0731356ae426c5b6d3d7a8ab05143fa78d257af9b9d037be7b49
SHA512

fc5b0416333ba59d7af489255f258db879bf1b7639000a54ff233b100cb50ff57f0026512d58fb540d87cdac0a398c1b796ef4156cd8293e4a1978b2f4c0aa15
SSDEEP

98304:1OXPiu6YrHfZ1diRq+/gr56mQr+dFiJzqGT4q:Qiu6MfZ1dt+AVq6mei4q

Score

10^/10

quasar svchost32 discovery execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

svchost32

185.147.124.146:4782

Mutex

70595b2f-92ed-4cab-b358-5e9c155366b4

Attributes

encryption_key
B207941BD17A6DAD99D4F816F934730315BCD00D
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 family
quasar

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/2796-82-0x000000001BCD0000-0x000000001BFF4000-memory.dmp	family_quasar

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-1-5-21-4174397412-4125106315-2776226590-1000\Control Panel\International\Geo\Nation	BT.tmp

Executes dropped EXE 2 IoCs

pid	Process
384	BT.tmp
3424	BT.tmp

Loads dropped DLL 8 IoCs

pid	Process
384	BT.tmp
384	BT.tmp
3424	BT.tmp
3424	BT.tmp
748	regsvr32.exe
2796	regsvr32.exe
752	regsvr32.EXE
5088	regsvr32.EXE

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Command and Scripting Interpreter: PowerShell 1 TTPs 5 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2032	powershell.exe
2032	powershell.exe
4004	powershell.exe
4700	powershell.exe
1968	powershell.exe

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 5 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	BT.tmp
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	BT.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	BT.tmp
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	BT.exe

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
3424	BT.tmp
3424	BT.tmp
2796	regsvr32.exe
2796	regsvr32.exe
1968	powershell.exe
1968	powershell.exe
2032	powershell.exe
2032	powershell.exe
2796	regsvr32.exe
2796	regsvr32.exe
752	regsvr32.EXE
752	regsvr32.EXE
4004	powershell.exe
4004	powershell.exe
752	regsvr32.EXE
752	regsvr32.EXE
5088	regsvr32.EXE
5088	regsvr32.EXE
4700	powershell.exe
4700	powershell.exe
5088	regsvr32.EXE
5088	regsvr32.EXE

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1968	powershell.exe
Token: SeIncreaseQuotaPrivilege	1968	powershell.exe
Token: SeSecurityPrivilege	1968	powershell.exe
Token: SeTakeOwnershipPrivilege	1968	powershell.exe
Token: SeLoadDriverPrivilege	1968	powershell.exe
Token: SeSystemProfilePrivilege	1968	powershell.exe
Token: SeSystemtimePrivilege	1968	powershell.exe
Token: SeProfSingleProcessPrivilege	1968	powershell.exe
Token: SeIncBasePriorityPrivilege	1968	powershell.exe
Token: SeCreatePagefilePrivilege	1968	powershell.exe
Token: SeBackupPrivilege	1968	powershell.exe
Token: SeRestorePrivilege	1968	powershell.exe
Token: SeShutdownPrivilege	1968	powershell.exe
Token: SeDebugPrivilege	1968	powershell.exe
Token: SeSystemEnvironmentPrivilege	1968	powershell.exe
Token: SeRemoteShutdownPrivilege	1968	powershell.exe
Token: SeUndockPrivilege	1968	powershell.exe
Token: SeManageVolumePrivilege	1968	powershell.exe
Token: 33	1968	powershell.exe
Token: 34	1968	powershell.exe
Token: 35	1968	powershell.exe
Token: 36	1968	powershell.exe
Token: SeDebugPrivilege	2032	powershell.exe
Token: SeIncreaseQuotaPrivilege	2032	powershell.exe
Token: SeSecurityPrivilege	2032	powershell.exe
Token: SeTakeOwnershipPrivilege	2032	powershell.exe
Token: SeLoadDriverPrivilege	2032	powershell.exe
Token: SeSystemProfilePrivilege	2032	powershell.exe
Token: SeSystemtimePrivilege	2032	powershell.exe
Token: SeProfSingleProcessPrivilege	2032	powershell.exe
Token: SeIncBasePriorityPrivilege	2032	powershell.exe
Token: SeCreatePagefilePrivilege	2032	powershell.exe
Token: SeBackupPrivilege	2032	powershell.exe
Token: SeRestorePrivilege	2032	powershell.exe
Token: SeShutdownPrivilege	2032	powershell.exe
Token: SeDebugPrivilege	2032	powershell.exe
Token: SeSystemEnvironmentPrivilege	2032	powershell.exe
Token: SeRemoteShutdownPrivilege	2032	powershell.exe
Token: SeUndockPrivilege	2032	powershell.exe
Token: SeManageVolumePrivilege	2032	powershell.exe
Token: 33	2032	powershell.exe
Token: 34	2032	powershell.exe
Token: 35	2032	powershell.exe
Token: 36	2032	powershell.exe
Token: SeIncreaseQuotaPrivilege	2032	powershell.exe
Token: SeSecurityPrivilege	2032	powershell.exe
Token: SeTakeOwnershipPrivilege	2032	powershell.exe
Token: SeLoadDriverPrivilege	2032	powershell.exe
Token: SeSystemProfilePrivilege	2032	powershell.exe
Token: SeSystemtimePrivilege	2032	powershell.exe
Token: SeProfSingleProcessPrivilege	2032	powershell.exe
Token: SeIncBasePriorityPrivilege	2032	powershell.exe
Token: SeCreatePagefilePrivilege	2032	powershell.exe
Token: SeBackupPrivilege	2032	powershell.exe
Token: SeRestorePrivilege	2032	powershell.exe
Token: SeShutdownPrivilege	2032	powershell.exe
Token: SeDebugPrivilege	2032	powershell.exe
Token: SeSystemEnvironmentPrivilege	2032	powershell.exe
Token: SeRemoteShutdownPrivilege	2032	powershell.exe
Token: SeUndockPrivilege	2032	powershell.exe
Token: SeManageVolumePrivilege	2032	powershell.exe
Token: 33	2032	powershell.exe
Token: 34	2032	powershell.exe
Token: 35	2032	powershell.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3424	BT.tmp

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2796	regsvr32.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 5004 wrote to memory of 384	5004	BT.exe	85
PID 5004 wrote to memory of 384	5004	BT.exe	85
PID 5004 wrote to memory of 384	5004	BT.exe	85
PID 384 wrote to memory of 5076	384	BT.tmp	86
PID 384 wrote to memory of 5076	384	BT.tmp	86
PID 384 wrote to memory of 5076	384	BT.tmp	86
PID 5076 wrote to memory of 3424	5076	BT.exe	87
PID 5076 wrote to memory of 3424	5076	BT.exe	87
PID 5076 wrote to memory of 3424	5076	BT.exe	87
PID 3424 wrote to memory of 748	3424	BT.tmp	88
PID 3424 wrote to memory of 748	3424	BT.tmp	88
PID 3424 wrote to memory of 748	3424	BT.tmp	88
PID 748 wrote to memory of 2796	748	regsvr32.exe	89
PID 748 wrote to memory of 2796	748	regsvr32.exe	89
PID 2796 wrote to memory of 1968	2796	regsvr32.exe	90
PID 2796 wrote to memory of 1968	2796	regsvr32.exe	90
PID 2796 wrote to memory of 2032	2796	regsvr32.exe	93
PID 2796 wrote to memory of 2032	2796	regsvr32.exe	93
PID 752 wrote to memory of 4004	752	regsvr32.EXE	107
PID 752 wrote to memory of 4004	752	regsvr32.EXE	107
PID 5088 wrote to memory of 4700	5088	regsvr32.EXE	111
PID 5088 wrote to memory of 4700	5088	regsvr32.EXE	111

C:\Users\Admin\AppData\Local\Temp\BT.exe
"C:\Users\Admin\AppData\Local\Temp\BT.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5004
- C:\Users\Admin\AppData\Local\Temp\is-SOL0A.tmp\BT.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-SOL0A.tmp\BT.tmp" /SL5="$80068,2956477,245248,C:\Users\Admin\AppData\Local\Temp\BT.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:384
- - C:\Users\Admin\AppData\Local\Temp\BT.exe
    "C:\Users\Admin\AppData\Local\Temp\BT.exe" /VERYSILENT
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:5076
  - - C:\Users\Admin\AppData\Local\Temp\is-I8JRR.tmp\BT.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-I8JRR.tmp\BT.tmp" /SL5="$502EA,2956477,245248,C:\Users\Admin\AppData\Local\Temp\BT.exe" /VERYSILENT
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of FindShellTrayWindow
      Suspicious use of WriteProcessMemory
      PID:3424
    - - C:\Windows\SysWOW64\regsvr32.exe
        
        "regsvr32.exe" /s /i:SYNC "C:\Users\Admin\AppData\Roaming\\d3d9_4.drv"
        5⤵
        Loads dropped DLL
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:748
      - C:\Windows\system32\regsvr32.exe
        
        /s /i:SYNC "C:\Users\Admin\AppData\Roaming\\d3d9_4.drv"
        6⤵
        Loads dropped DLL
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:2796
        
        C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command "if (Get-ScheduledTask | Where-Object { $_.Actions.Execute -eq 'regsvr32' -and $_.Actions.Arguments -eq '/S /i:SYNC C:\Users\Admin\AppData\Roaming\d3d9_4.drv' }) { exit 0 } else { exit 1 }"
        7⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1968
        
        C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" "Register-ScheduledTask -Action (New-ScheduledTaskAction -Execute \"regsvr32\" -Argument \"/S /i:SYNC C:\Users\Admin\AppData\Roaming\d3d9_4.drv\") -Trigger (New-ScheduledTaskTrigger -Once -At (Get-Date).AddMinutes(1) -RepetitionInterval (New-TimeSpan -Minutes 1)) -TaskName 'MicrosoftEdgeUpdateTaskMachineUA{DCF9EDFC-AA29-4208-F12F-23617638CA2C}' -Description 'MicrosoftEdgeUpdateTaskMachineUA' -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries -ExecutionTimeLimit 0) -RunLevel Highest"
        7⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2032

C:\Windows\system32\regsvr32.EXE
C:\Windows\system32\regsvr32.EXE /S /i:SYNC C:\Users\Admin\AppData\Roaming\d3d9_4.drv
1⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:752
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell" -Command "if (Get-ScheduledTask | Where-Object { $_.Actions.Execute -eq 'regsvr32' -and $_.Actions.Arguments -eq '/S /i:SYNC C:\Users\Admin\AppData\Roaming\d3d9_4.drv' }) { exit 0 } else { exit 1 }"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  PID:4004

C:\Windows\system32\regsvr32.EXE
C:\Windows\system32\regsvr32.EXE /S /i:SYNC C:\Users\Admin\AppData\Roaming\d3d9_4.drv
1⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:5088
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell" -Command "if (Get-ScheduledTask | Where-Object { $_.Actions.Execute -eq 'regsvr32' -and $_.Actions.Arguments -eq '/S /i:SYNC C:\Users\Admin\AppData\Roaming\d3d9_4.drv' }) { exit 0 } else { exit 1 }"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  PID:4700

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

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

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

Filesize
3KB

MD5
661739d384d9dfd807a089721202900b

SHA1
5b2c5d6a7122b4ce849dc98e79a7713038feac55

SHA256
70c3ecbaa6df88e88df4efc70968502955e890a2248269641c4e2d4668ef61bf

SHA512
81b48ae5c4064c4d9597303d913e32d3954954ba1c8123731d503d1653a0d848856812d2ee6951efe06b1db2b91a50e5d54098f60c26f36bc8390203f4c8a2d8

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

Filesize
1KB

MD5
ff54d080900146cd2249ec4d3e7c1ca3

SHA1
44c5db22a9213e8770cb65a23d4593d550373e38

SHA256
96fbcb8ab5e1e01e6a21180303302547dea61539b0a1ed9050b56bcac9d2919f

SHA512
7e8f8254aa09ff129089fdb114cd92190e96df9109ea559b1d3528ecebeb1e296f6954bc299dbf2d94b6e9d96a883bf66d613a9eba44f471321eddad609de677

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

Filesize
1KB

MD5
761c9d07f3ec715149f670eb7c0e483d

SHA1
55f9ae7eb9b01f20cefe6bd8e922ddc11f526362

SHA256
e47b9dde274b35210fedd7a75c799c1ae54c241819a5e8981f56d813405fa9fc

SHA512
d03eac1a14d6403aeca12437f9621b62d655873b41cebb39199fc374bbf04f2d271c26c31abbfd4db641f145292c9b8b0473025635b366ca389bf8190b96fa0d

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

Filesize
1KB

MD5
c8c29f1f588816cb69fcebf642891720

SHA1
968d91f771b5e235c91952025509479c4456b44e

SHA256
2e1d2b0a86abe46d40843dbc522f6c9891671b21c1ac61e21d32f7245a93eb8b

SHA512
6b19696757654762ec551388c04142d4404892314c3e8a811b3260834dd6110b57be9aa4a0497ff579a4936c91cbdfbf7a938f676ee24e7476ecdd1b668cac3a

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_1zqogjcq.2ik.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-P97JU.tmp\_isetup\_shfoldr.dll

Filesize
22KB

MD5
92dc6ef532fbb4a5c3201469a5b5eb63

SHA1
3e89ff837147c16b4e41c30d6c796374e0b8e62c

SHA256
9884e9d1b4f8a873ccbd81f8ad0ae257776d2348d027d811a56475e028360d87

SHA512
9908e573921d5dbc3454a1c0a6c969ab8a81cc2e8b5385391d46b1a738fb06a76aa3282e0e58d0d2ffa6f27c85668cd5178e1500b8a39b1bbae04366ae6a86d3

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-QS0S4.tmp\_isetup\_isdecmp.dll

Filesize
13KB

MD5
a813d18268affd4763dde940246dc7e5

SHA1
c7366e1fd925c17cc6068001bd38eaef5b42852f

SHA256
e19781aabe466dd8779cb9c8fa41bbb73375447066bb34e876cf388a6ed63c64

SHA512
b310ed4cd2e94381c00a6a370fcb7cc867ebe425d705b69caaaaffdafbab91f72d357966916053e72e68ecf712f2af7585500c58bb53ec3e1d539179fcb45fb4

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-SOL0A.tmp\BT.tmp

Filesize
1.2MB

MD5
70fcedd0d46d1c97af8e3eb4868c5bf1

SHA1
42ae1e3080be4720fc1bb97ef63d59f2f26e1558

SHA256
fcae74ccb09740303d86a88dd07db209721458e8eb48697f1c7d666a67dd5a07

SHA512
2cc42882fbdcd3d8bc4c3caa2116b76bd65fccff35e6058cfe67a80a307251b77bcbf17ddbd51e9d566f6810ac95ea33848da2a733cab6135d399dfaaf0c1020

Download Submit
C:\Users\Admin\AppData\Roaming\d3d9_4.drv

Filesize
4.2MB

MD5
707e9a2445ea22ce1bfafbad0583c1d4

SHA1
73918fb8eb7b21c2d6bb27f9ce48c23c92bef006

SHA256
3455e2e96cd0a23323da81a2bcf9566200de523f1d1d85efe27f55ed2add9e8b

SHA512
77485310a94451eb2246caf0cb03743facde00a7531eaea32725782f39b5b84739b71f203668b96f3e9e5ebee088fc0283406e9129ed27694cf9b8e67bbbbe66

Download Submit
memory/384-7-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/384-26-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/752-103-0x00007FFA01C10000-0x00007FFA0205C000-memory.dmp

Filesize
4.3MB

Download
memory/1968-56-0x0000024A61960000-0x0000024A61982000-memory.dmp

Filesize
136KB

Download
memory/2796-85-0x00007FFA01C10000-0x00007FFA0205C000-memory.dmp

Filesize
4.3MB

Download
memory/2796-82-0x000000001BCD0000-0x000000001BFF4000-memory.dmp

Filesize
3.1MB

Download
memory/2796-83-0x000000001BB90000-0x000000001BBE0000-memory.dmp

Filesize
320KB

Download
memory/2796-84-0x000000001CC70000-0x000000001CD22000-memory.dmp

Filesize
712KB

Download
memory/3424-51-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/3424-36-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/5004-0-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/5004-27-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/5004-1-0x0000000000401000-0x0000000000417000-memory.dmp

Filesize
88KB

Download
memory/5076-55-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/5076-23-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/5076-21-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/5088-122-0x00007FFA01C10000-0x00007FFA0205C000-memory.dmp

Filesize
4.3MB

Download