quasar | f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882

Analysis

max time kernel
141s
max time network
142s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
31-01-2025 08:48

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General

Target

win64_svchost.exe
Size

3.2MB
MD5

f31a91bff6bb5805f4f7b95c0a27cb2a
SHA1

8eeef2262c4288c035d7be99f27ce478dae008ce
SHA256

f9fc23fe47d3c918c7bc24cbe14e56d9b0024e31660f2a280f3991291b3e5882
SHA512

07f750faf48ef505de12a07acf64136468702ba07d7b5ec9ecbc3d2f6e5c04c3c7ce0ff4b178c5f2f3a1df2b9b0ea8f54687f90137fa58603ddd0896733eaacb
SSDEEP

98304:p1AhvWM65Mf9cZR4FklYJr41ADevpgaSoJxqGT4q:WvWM6iGKkCJ0GevCaXsi4q

Score

10^/10

quasar svhost32 discovery execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

svhost32

185.147.125.77:4782

Mutex

9500f2e5-aa22-4d12-a2ea-09ddc5050666

Attributes

encryption_key
BD29CA798222621C677ECD67804E6D9D0A95CFCB
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
behavioral1/memory/2692-72-0x000000001BC60000-0x000000001BF84000-memory.dmp	family_quasar

Executes dropped EXE 2 IoCs

pid	Process
1636	win64_svchost.tmp
2660	win64_svchost.tmp

Loads dropped DLL 10 IoCs

pid	Process
1840	win64_svchost.exe
1636	win64_svchost.tmp
1636	win64_svchost.tmp
1636	win64_svchost.tmp
2716	win64_svchost.exe
2660	win64_svchost.tmp
2660	win64_svchost.tmp
2660	win64_svchost.tmp
2744	regsvr32.exe
2692	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 3 IoCs

Run Powershell to execute payload.

execution

PowerShell

T1059.001

pid	Process
2596	powershell.exe
2796	powershell.exe
2596	powershell.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\%ProgramData%\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\Windows PowerShell.lnk	powershell.exe
File opened for modification	C:\Windows\System32\%ProgramData%\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\Windows PowerShell.lnk	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	win64_svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	win64_svchost.tmp
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	win64_svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	win64_svchost.tmp

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2660	win64_svchost.tmp
2660	win64_svchost.tmp
2692	regsvr32.exe
2796	powershell.exe
2596	powershell.exe
2692	regsvr32.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2796	powershell.exe
Token: SeDebugPrivilege	2596	powershell.exe
Token: SeDebugPrivilege	2692	regsvr32.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2660	win64_svchost.tmp

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2692	regsvr32.exe

Suspicious use of WriteProcessMemory 41 IoCs

description	pid	Process	procid_target
PID 1840 wrote to memory of 1636	1840	win64_svchost.exe	31
PID 1840 wrote to memory of 1636	1840	win64_svchost.exe	31
PID 1840 wrote to memory of 1636	1840	win64_svchost.exe	31
PID 1840 wrote to memory of 1636	1840	win64_svchost.exe	31
PID 1840 wrote to memory of 1636	1840	win64_svchost.exe	31
PID 1840 wrote to memory of 1636	1840	win64_svchost.exe	31
PID 1840 wrote to memory of 1636	1840	win64_svchost.exe	31
PID 1636 wrote to memory of 2716	1636	win64_svchost.tmp	32
PID 1636 wrote to memory of 2716	1636	win64_svchost.tmp	32
PID 1636 wrote to memory of 2716	1636	win64_svchost.tmp	32
PID 1636 wrote to memory of 2716	1636	win64_svchost.tmp	32
PID 1636 wrote to memory of 2716	1636	win64_svchost.tmp	32
PID 1636 wrote to memory of 2716	1636	win64_svchost.tmp	32
PID 1636 wrote to memory of 2716	1636	win64_svchost.tmp	32
PID 2716 wrote to memory of 2660	2716	win64_svchost.exe	33
PID 2716 wrote to memory of 2660	2716	win64_svchost.exe	33
PID 2716 wrote to memory of 2660	2716	win64_svchost.exe	33
PID 2716 wrote to memory of 2660	2716	win64_svchost.exe	33
PID 2716 wrote to memory of 2660	2716	win64_svchost.exe	33
PID 2716 wrote to memory of 2660	2716	win64_svchost.exe	33
PID 2716 wrote to memory of 2660	2716	win64_svchost.exe	33
PID 2660 wrote to memory of 2744	2660	win64_svchost.tmp	34
PID 2660 wrote to memory of 2744	2660	win64_svchost.tmp	34
PID 2660 wrote to memory of 2744	2660	win64_svchost.tmp	34
PID 2660 wrote to memory of 2744	2660	win64_svchost.tmp	34
PID 2660 wrote to memory of 2744	2660	win64_svchost.tmp	34
PID 2660 wrote to memory of 2744	2660	win64_svchost.tmp	34
PID 2660 wrote to memory of 2744	2660	win64_svchost.tmp	34
PID 2744 wrote to memory of 2692	2744	regsvr32.exe	35
PID 2744 wrote to memory of 2692	2744	regsvr32.exe	35
PID 2744 wrote to memory of 2692	2744	regsvr32.exe	35
PID 2744 wrote to memory of 2692	2744	regsvr32.exe	35
PID 2744 wrote to memory of 2692	2744	regsvr32.exe	35
PID 2744 wrote to memory of 2692	2744	regsvr32.exe	35
PID 2744 wrote to memory of 2692	2744	regsvr32.exe	35
PID 2692 wrote to memory of 2796	2692	regsvr32.exe	36
PID 2692 wrote to memory of 2796	2692	regsvr32.exe	36
PID 2692 wrote to memory of 2796	2692	regsvr32.exe	36
PID 2692 wrote to memory of 2596	2692	regsvr32.exe	38
PID 2692 wrote to memory of 2596	2692	regsvr32.exe	38
PID 2692 wrote to memory of 2596	2692	regsvr32.exe	38

C:\Users\Admin\AppData\Local\Temp\win64_svchost.exe
"C:\Users\Admin\AppData\Local\Temp\win64_svchost.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1840
- C:\Users\Admin\AppData\Local\Temp\is-AICI0.tmp\win64_svchost.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-AICI0.tmp\win64_svchost.tmp" /SL5="$400F8,2958433,245248,C:\Users\Admin\AppData\Local\Temp\win64_svchost.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1636
- - C:\Users\Admin\AppData\Local\Temp\win64_svchost.exe
    "C:\Users\Admin\AppData\Local\Temp\win64_svchost.exe" /VERYSILENT
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2716
  - - C:\Users\Admin\AppData\Local\Temp\is-G2VO4.tmp\win64_svchost.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-G2VO4.tmp\win64_svchost.tmp" /SL5="$500F8,2958433,245248,C:\Users\Admin\AppData\Local\Temp\win64_svchost.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:2660
    - - C:\Windows\SysWOW64\regsvr32.exe
        
        "regsvr32.exe" /s /i:SYNC "C:\Users\Admin\AppData\Roaming\\7ntdll.drv"
        5⤵
        Loads dropped DLL
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:2744
      - C:\Windows\system32\regsvr32.exe
        
        /s /i:SYNC "C:\Users\Admin\AppData\Roaming\\7ntdll.drv"
        6⤵
        Loads dropped DLL
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:2692
        
        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\7ntdll.drv' }) { exit 0 } else { exit 1 }"
        7⤵
        Command and Scripting Interpreter: PowerShell
        Drops file in System32 directory
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2796
        
        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\7ntdll.drv\") -Trigger (New-ScheduledTaskTrigger -Once -At (Get-Date).AddMinutes(1) -RepetitionInterval (New-TimeSpan -Minutes 1)) -TaskName 'MicrosoftEdgeUpdateTaskMachineUA{E9F0BB2C-8E75-48C7-C375-4A890D766CD7}' -Description 'MicrosoftEdgeUpdateTaskMachineUA' -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries -ExecutionTimeLimit 0) -RunLevel Highest"
        7⤵
        Command and Scripting Interpreter: PowerShell
        Drops file in System32 directory
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2596

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

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Downloads

C:\Users\Admin\AppData\Roaming\7ntdll.drv

Filesize
4.2MB

MD5
0964f6b8db5ffcd0f8817a752ab91fc0

SHA1
1c625ee61cff5f030d080e8124b134542e1ceae7

SHA256
5f69aad1615fa97e4204b25c0bdcab15bc009f4368d8e15981dfbd3b1bb5f8f0

SHA512
2428f2dca314526df68ac5c3e142fc114166f2301d15aa5da5e9c2cdca2071709e806bcc94790f665fdd77d454107a0786f5314bcdedf4ce01280af729e568b6

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
e6a7948de19a5ae2c96b38ede50e7f20

SHA1
cd2be1a40cf45b8b073faf5b2d58d63fc032cc66

SHA256
91768772f03587d4114d4e7833327f0fd4ab719220416d31a5927f3789f9ae34

SHA512
c16de07fbe7685984999c04284ac2dbe252c6b0be6a5fdaa86f0924b238dbd2f6556178f808a9e99e421cb6862b043ac319406d7097ac074a983b0299ea82685

Download Submit
\Users\Admin\AppData\Local\Temp\is-9REVM.tmp\_isetup\_isdecmp.dll

Filesize
13KB

MD5
a813d18268affd4763dde940246dc7e5

SHA1
c7366e1fd925c17cc6068001bd38eaef5b42852f

SHA256
e19781aabe466dd8779cb9c8fa41bbb73375447066bb34e876cf388a6ed63c64

SHA512
b310ed4cd2e94381c00a6a370fcb7cc867ebe425d705b69caaaaffdafbab91f72d357966916053e72e68ecf712f2af7585500c58bb53ec3e1d539179fcb45fb4

Download Submit
\Users\Admin\AppData\Local\Temp\is-9REVM.tmp\_isetup\_shfoldr.dll

Filesize
22KB

MD5
92dc6ef532fbb4a5c3201469a5b5eb63

SHA1
3e89ff837147c16b4e41c30d6c796374e0b8e62c

SHA256
9884e9d1b4f8a873ccbd81f8ad0ae257776d2348d027d811a56475e028360d87

SHA512
9908e573921d5dbc3454a1c0a6c969ab8a81cc2e8b5385391d46b1a738fb06a76aa3282e0e58d0d2ffa6f27c85668cd5178e1500b8a39b1bbae04366ae6a86d3

Download Submit
\Users\Admin\AppData\Local\Temp\is-AICI0.tmp\win64_svchost.tmp

Filesize
1.2MB

MD5
70fcedd0d46d1c97af8e3eb4868c5bf1

SHA1
42ae1e3080be4720fc1bb97ef63d59f2f26e1558

SHA256
fcae74ccb09740303d86a88dd07db209721458e8eb48697f1c7d666a67dd5a07

SHA512
2cc42882fbdcd3d8bc4c3caa2116b76bd65fccff35e6058cfe67a80a307251b77bcbf17ddbd51e9d566f6810ac95ea33848da2a733cab6135d399dfaaf0c1020

Download Submit
memory/1636-22-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/1636-8-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/1840-0-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/1840-25-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/1840-2-0x0000000000401000-0x0000000000417000-memory.dmp

Filesize
88KB

Download
memory/2596-70-0x00000000028E0000-0x00000000028E8000-memory.dmp

Filesize
32KB

Download
memory/2596-69-0x000000001B5E0000-0x000000001B8C2000-memory.dmp

Filesize
2.9MB

Download
memory/2660-51-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/2692-72-0x000000001BC60000-0x000000001BF84000-memory.dmp

Filesize
3.1MB

Download
memory/2692-73-0x000007FEF6660000-0x000007FEF6AAC000-memory.dmp

Filesize
4.3MB

Download
memory/2716-53-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/2716-24-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/2716-28-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/2796-61-0x000000001B460000-0x000000001B742000-memory.dmp

Filesize
2.9MB

Download
memory/2796-62-0x0000000002AE0000-0x0000000002AE8000-memory.dmp

Filesize
32KB

Download