quasar | c6d8cde7cd9d0731356ae426c5b6d3d7a8ab05143fa78d257af9b9d037be7b49

Analysis

max time kernel
149s
max time network
150s
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 07:02

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

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/2032-82-0x000000001B8F0000-0x000000001BC14000-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
3960	BT.tmp
4484	BT.tmp

Loads dropped DLL 8 IoCs

pid	Process
3960	BT.tmp
3960	BT.tmp
4484	BT.tmp
4484	BT.tmp
3972	regsvr32.exe
2032	regsvr32.exe
1032	regsvr32.EXE
3804	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

Run Powershell to execute payload.

execution

PowerShell

T1059.001

pid	Process
4356	powershell.exe
2228	powershell.exe
2856	powershell.exe
2168	powershell.exe
2228	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.exe
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

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
4484	BT.tmp
4484	BT.tmp
2032	regsvr32.exe
2032	regsvr32.exe
4356	powershell.exe
4356	powershell.exe
2228	powershell.exe
2228	powershell.exe
2032	regsvr32.exe
2032	regsvr32.exe
1032	regsvr32.EXE
1032	regsvr32.EXE
2856	powershell.exe
2856	powershell.exe
1032	regsvr32.EXE
1032	regsvr32.EXE
3804	regsvr32.EXE
3804	regsvr32.EXE
2168	powershell.exe
2168	powershell.exe
3804	regsvr32.EXE
3804	regsvr32.EXE

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4356	powershell.exe
Token: SeIncreaseQuotaPrivilege	4356	powershell.exe
Token: SeSecurityPrivilege	4356	powershell.exe
Token: SeTakeOwnershipPrivilege	4356	powershell.exe
Token: SeLoadDriverPrivilege	4356	powershell.exe
Token: SeSystemProfilePrivilege	4356	powershell.exe
Token: SeSystemtimePrivilege	4356	powershell.exe
Token: SeProfSingleProcessPrivilege	4356	powershell.exe
Token: SeIncBasePriorityPrivilege	4356	powershell.exe
Token: SeCreatePagefilePrivilege	4356	powershell.exe
Token: SeBackupPrivilege	4356	powershell.exe
Token: SeRestorePrivilege	4356	powershell.exe
Token: SeShutdownPrivilege	4356	powershell.exe
Token: SeDebugPrivilege	4356	powershell.exe
Token: SeSystemEnvironmentPrivilege	4356	powershell.exe
Token: SeRemoteShutdownPrivilege	4356	powershell.exe
Token: SeUndockPrivilege	4356	powershell.exe
Token: SeManageVolumePrivilege	4356	powershell.exe
Token: 33	4356	powershell.exe
Token: 34	4356	powershell.exe
Token: 35	4356	powershell.exe
Token: 36	4356	powershell.exe
Token: SeDebugPrivilege	2228	powershell.exe
Token: SeIncreaseQuotaPrivilege	2228	powershell.exe
Token: SeSecurityPrivilege	2228	powershell.exe
Token: SeTakeOwnershipPrivilege	2228	powershell.exe
Token: SeLoadDriverPrivilege	2228	powershell.exe
Token: SeSystemProfilePrivilege	2228	powershell.exe
Token: SeSystemtimePrivilege	2228	powershell.exe
Token: SeProfSingleProcessPrivilege	2228	powershell.exe
Token: SeIncBasePriorityPrivilege	2228	powershell.exe
Token: SeCreatePagefilePrivilege	2228	powershell.exe
Token: SeBackupPrivilege	2228	powershell.exe
Token: SeRestorePrivilege	2228	powershell.exe
Token: SeShutdownPrivilege	2228	powershell.exe
Token: SeDebugPrivilege	2228	powershell.exe
Token: SeSystemEnvironmentPrivilege	2228	powershell.exe
Token: SeRemoteShutdownPrivilege	2228	powershell.exe
Token: SeUndockPrivilege	2228	powershell.exe
Token: SeManageVolumePrivilege	2228	powershell.exe
Token: 33	2228	powershell.exe
Token: 34	2228	powershell.exe
Token: 35	2228	powershell.exe
Token: 36	2228	powershell.exe
Token: SeIncreaseQuotaPrivilege	2228	powershell.exe
Token: SeSecurityPrivilege	2228	powershell.exe
Token: SeTakeOwnershipPrivilege	2228	powershell.exe
Token: SeLoadDriverPrivilege	2228	powershell.exe
Token: SeSystemProfilePrivilege	2228	powershell.exe
Token: SeSystemtimePrivilege	2228	powershell.exe
Token: SeProfSingleProcessPrivilege	2228	powershell.exe
Token: SeIncBasePriorityPrivilege	2228	powershell.exe
Token: SeCreatePagefilePrivilege	2228	powershell.exe
Token: SeBackupPrivilege	2228	powershell.exe
Token: SeRestorePrivilege	2228	powershell.exe
Token: SeShutdownPrivilege	2228	powershell.exe
Token: SeDebugPrivilege	2228	powershell.exe
Token: SeSystemEnvironmentPrivilege	2228	powershell.exe
Token: SeRemoteShutdownPrivilege	2228	powershell.exe
Token: SeUndockPrivilege	2228	powershell.exe
Token: SeManageVolumePrivilege	2228	powershell.exe
Token: 33	2228	powershell.exe
Token: 34	2228	powershell.exe
Token: 35	2228	powershell.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4484	BT.tmp

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2032	regsvr32.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 4860 wrote to memory of 3960	4860	BT.exe	81
PID 4860 wrote to memory of 3960	4860	BT.exe	81
PID 4860 wrote to memory of 3960	4860	BT.exe	81
PID 3960 wrote to memory of 3612	3960	BT.tmp	82
PID 3960 wrote to memory of 3612	3960	BT.tmp	82
PID 3960 wrote to memory of 3612	3960	BT.tmp	82
PID 3612 wrote to memory of 4484	3612	BT.exe	83
PID 3612 wrote to memory of 4484	3612	BT.exe	83
PID 3612 wrote to memory of 4484	3612	BT.exe	83
PID 4484 wrote to memory of 3972	4484	BT.tmp	88
PID 4484 wrote to memory of 3972	4484	BT.tmp	88
PID 4484 wrote to memory of 3972	4484	BT.tmp	88
PID 3972 wrote to memory of 2032	3972	regsvr32.exe	89
PID 3972 wrote to memory of 2032	3972	regsvr32.exe	89
PID 2032 wrote to memory of 4356	2032	regsvr32.exe	91
PID 2032 wrote to memory of 4356	2032	regsvr32.exe	91
PID 2032 wrote to memory of 2228	2032	regsvr32.exe	94
PID 2032 wrote to memory of 2228	2032	regsvr32.exe	94
PID 1032 wrote to memory of 2856	1032	regsvr32.EXE	101
PID 1032 wrote to memory of 2856	1032	regsvr32.EXE	101
PID 3804 wrote to memory of 2168	3804	regsvr32.EXE	104
PID 3804 wrote to memory of 2168	3804	regsvr32.EXE	104

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:4860
- C:\Users\Admin\AppData\Local\Temp\is-FSISK.tmp\BT.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-FSISK.tmp\BT.tmp" /SL5="$70044,2956477,245248,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:3960
- - 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:3612
  - - C:\Users\Admin\AppData\Local\Temp\is-O65HI.tmp\BT.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-O65HI.tmp\BT.tmp" /SL5="$7024C,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:4484
    - - 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:3972
      - 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:2032
        
        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:4356
        
        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{8317DA3D-F6E9-40F2-EC44-92A9F87B33DA}' -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:2228

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:1032
- 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:2856

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:3804
- 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:2168

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

Replay Monitor

Loading Replay Monitor...

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
62032a79f8416ef5fe25b81955c2f5dd

SHA1
9c996b27944668b8fe4a490d7c1a99e94efa190c

SHA256
02a537f84c804887adbfe6404b5b7e060cbe22204206d17cafb3f86c02e594fe

SHA512
f58610ff90367e6b4fa6eaeb9778e3d3032df44bf9577ddd338beaca7201a150709bcdfe38cf88039f4009cba22bcb11099562d2b01ac1089f4d6ee38cdead28

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

Filesize
1KB

MD5
6b3f025e0fe16f90a195d5a845ea92c4

SHA1
2039ca9aedf7bde38d5f538991ac4c3684651a07

SHA256
cc1288db96dcc16fd4bef4fa2dd6d85e313af2e4c23fdf7f23b7f654cd61575a

SHA512
ac8c18b21ed5d090808d99c3d657691f9d47894e77d18a35d8906cbbcc2e6e5c3f5b6926241a492068b01c74263161967a7ecd4f1b1972e65ae509bf5df5a20e

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

Filesize
1KB

MD5
a1426a02d26a2ba125dfcd244246fc30

SHA1
7dc4c494052e67338f1875f912f493144a93aea5

SHA256
8c3cd26e85f6c35cf2372d40a3d59c27c37026712d4a4fb0534ed12bf45c2386

SHA512
ac2172a0c2c8a4efdd550521920c8754c2af1079cef2a401f10a250118d7edf7f0ff76a17e71e39ae78123dd9ccaf0dc24e64bd1caae4567959527ff21cf4225

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2einwwl3.03g.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-B46BJ.tmp\_isetup\_shfoldr.dll

Filesize
22KB

MD5
92dc6ef532fbb4a5c3201469a5b5eb63

SHA1
3e89ff837147c16b4e41c30d6c796374e0b8e62c

SHA256
9884e9d1b4f8a873ccbd81f8ad0ae257776d2348d027d811a56475e028360d87

SHA512
9908e573921d5dbc3454a1c0a6c969ab8a81cc2e8b5385391d46b1a738fb06a76aa3282e0e58d0d2ffa6f27c85668cd5178e1500b8a39b1bbae04366ae6a86d3

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-E1SV4.tmp\_isetup\_isdecmp.dll

Filesize
13KB

MD5
a813d18268affd4763dde940246dc7e5

SHA1
c7366e1fd925c17cc6068001bd38eaef5b42852f

SHA256
e19781aabe466dd8779cb9c8fa41bbb73375447066bb34e876cf388a6ed63c64

SHA512
b310ed4cd2e94381c00a6a370fcb7cc867ebe425d705b69caaaaffdafbab91f72d357966916053e72e68ecf712f2af7585500c58bb53ec3e1d539179fcb45fb4

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-FSISK.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/1032-103-0x00007FF82ABB0000-0x00007FF82AFFC000-memory.dmp

Filesize
4.3MB

Download
memory/2032-85-0x00007FF82ABB0000-0x00007FF82AFFC000-memory.dmp

Filesize
4.3MB

Download
memory/2032-82-0x000000001B8F0000-0x000000001BC14000-memory.dmp

Filesize
3.1MB

Download
memory/2032-83-0x000000001C590000-0x000000001C5E0000-memory.dmp

Filesize
320KB

Download
memory/2032-84-0x000000001C6A0000-0x000000001C752000-memory.dmp

Filesize
712KB

Download
memory/3612-23-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/3612-55-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/3612-21-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/3804-122-0x00007FF82ABB0000-0x00007FF82AFFC000-memory.dmp

Filesize
4.3MB

Download
memory/3960-25-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/3960-7-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/4356-56-0x000001D07FDE0000-0x000001D07FE02000-memory.dmp

Filesize
136KB

Download
memory/4484-51-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/4484-33-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/4860-26-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/4860-2-0x0000000000401000-0x0000000000417000-memory.dmp

Filesize
88KB

Download
memory/4860-0-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download