quasar | 1c5bb8ac1735f400b18f16ed5daab07575ba4aaedb4da31ca5cd89205bb40141

Analysis

max time kernel
138s
max time network
152s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
05-02-2024 04:25

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General

Target

91086ef2437049d4cfcb66149acf0d95.exe
Size

653KB
MD5

91086ef2437049d4cfcb66149acf0d95
SHA1

ac9cfed7ccfcd8676b437e753abdf7fc06981f71
SHA256

1c5bb8ac1735f400b18f16ed5daab07575ba4aaedb4da31ca5cd89205bb40141
SHA512

effe216b30c6371065d467e585f95db5106c35376a8fe430880a4e965c3a7927fb0453945036b19a6e0e7ec3d4a1290eee6e2445b68cd748086082da29db8046
SSDEEP

12288:bYBbFriWGl7gO03m4sRqJ2IOEEVR/7r+pKnoqsxWbvoyF3db6e0Rqs4J7S:MBxrd4lA7OvR/fqKoqsxsvoyFtbsqsJ

Score

10^/10

quasar venomrat windows firewall evasion persistence rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Windows firewall

23.105.131.187:7812

Mutex

VNM_MUTEX_zGeT5SjdI1pYgFyiav

Attributes

encryption_key
3kpwI2tkVNrXY2Mm5wlR
install_name
Windows Security.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Update
subdirectory
Windows Firewall Updates

Signatures

Contains code to disable Windows Defender 5 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

Processes:

resource	yara_rule
behavioral1/memory/2664-8-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2664-9-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2664-12-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2664-15-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2664-17-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def

Modifies Windows Defender Real-time Protection settings 3 TTPs 4 IoCs

evasion trojan

Modify Registry

T1112

Windows Service

T1543.003

Disable or Modify Tools

T1562.001

Processes:

91086ef2437049d4cfcb66149acf0d95.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection	91086ef2437049d4cfcb66149acf0d95.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	91086ef2437049d4cfcb66149acf0d95.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	91086ef2437049d4cfcb66149acf0d95.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	91086ef2437049d4cfcb66149acf0d95.exe

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

Quasar payload 5 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2664-8-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2664-9-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2664-12-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2664-15-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2664-17-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar

VenomRAT
VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.
rat rootkit stealer venomrat

Executes dropped EXE 2 IoCs

Processes:

Windows Security.exeWindows Security.exe

pid	Process
2740	Windows Security.exe
2968	Windows Security.exe

Loads dropped DLL 2 IoCs

Processes:

91086ef2437049d4cfcb66149acf0d95.exeWindows Security.exe

pid	Process
2664	91086ef2437049d4cfcb66149acf0d95.exe
2740	Windows Security.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

91086ef2437049d4cfcb66149acf0d95.exe

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	91086ef2437049d4cfcb66149acf0d95.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features	91086ef2437049d4cfcb66149acf0d95.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

91086ef2437049d4cfcb66149acf0d95.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3427588347-1492276948-3422228430-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\QwXMCzbSAJ = "C:\\Users\\Admin\\AppData\\Roaming\\jXMDeSqECF\\tEWMqGdDFT.exe"	91086ef2437049d4cfcb66149acf0d95.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
2	ip-api.com

Suspicious use of SetThreadContext 2 IoCs

Processes:

91086ef2437049d4cfcb66149acf0d95.exeWindows Security.exe

description	pid	Process	procid_target
PID 3000 set thread context of 2664	3000	91086ef2437049d4cfcb66149acf0d95.exe	28
PID 2740 set thread context of 2968	2740	Windows Security.exe	35

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

Processes:

schtasks.exeschtasks.exe

pid	Process
2116	schtasks.exe
2828	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

powershell.exe91086ef2437049d4cfcb66149acf0d95.exe

pid	Process
2572	powershell.exe
2664	91086ef2437049d4cfcb66149acf0d95.exe
2664	91086ef2437049d4cfcb66149acf0d95.exe
2664	91086ef2437049d4cfcb66149acf0d95.exe
2664	91086ef2437049d4cfcb66149acf0d95.exe
2664	91086ef2437049d4cfcb66149acf0d95.exe
2664	91086ef2437049d4cfcb66149acf0d95.exe
2664	91086ef2437049d4cfcb66149acf0d95.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

91086ef2437049d4cfcb66149acf0d95.exeWindows Security.exepowershell.exe

description	pid	Process
Token: SeDebugPrivilege	2664	91086ef2437049d4cfcb66149acf0d95.exe
Token: SeDebugPrivilege	2968	Windows Security.exe
Token: SeDebugPrivilege	2572	powershell.exe
Token: SeDebugPrivilege	2968	Windows Security.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Windows Security.exe

pid	Process
2968	Windows Security.exe

Suspicious use of WriteProcessMemory 46 IoCs

Processes:

91086ef2437049d4cfcb66149acf0d95.exe91086ef2437049d4cfcb66149acf0d95.exeWindows Security.exeWindows Security.execmd.exe

description	pid	Process	procid_target
PID 3000 wrote to memory of 2664	3000	91086ef2437049d4cfcb66149acf0d95.exe	28
PID 3000 wrote to memory of 2664	3000	91086ef2437049d4cfcb66149acf0d95.exe	28
PID 3000 wrote to memory of 2664	3000	91086ef2437049d4cfcb66149acf0d95.exe	28
PID 3000 wrote to memory of 2664	3000	91086ef2437049d4cfcb66149acf0d95.exe	28
PID 3000 wrote to memory of 2664	3000	91086ef2437049d4cfcb66149acf0d95.exe	28
PID 3000 wrote to memory of 2664	3000	91086ef2437049d4cfcb66149acf0d95.exe	28
PID 3000 wrote to memory of 2664	3000	91086ef2437049d4cfcb66149acf0d95.exe	28
PID 3000 wrote to memory of 2664	3000	91086ef2437049d4cfcb66149acf0d95.exe	28
PID 3000 wrote to memory of 2664	3000	91086ef2437049d4cfcb66149acf0d95.exe	28
PID 2664 wrote to memory of 2828	2664	91086ef2437049d4cfcb66149acf0d95.exe	30
PID 2664 wrote to memory of 2828	2664	91086ef2437049d4cfcb66149acf0d95.exe	30
PID 2664 wrote to memory of 2828	2664	91086ef2437049d4cfcb66149acf0d95.exe	30
PID 2664 wrote to memory of 2828	2664	91086ef2437049d4cfcb66149acf0d95.exe	30
PID 2664 wrote to memory of 2740	2664	91086ef2437049d4cfcb66149acf0d95.exe	32
PID 2664 wrote to memory of 2740	2664	91086ef2437049d4cfcb66149acf0d95.exe	32
PID 2664 wrote to memory of 2740	2664	91086ef2437049d4cfcb66149acf0d95.exe	32
PID 2664 wrote to memory of 2740	2664	91086ef2437049d4cfcb66149acf0d95.exe	32
PID 2664 wrote to memory of 2572	2664	91086ef2437049d4cfcb66149acf0d95.exe	33
PID 2664 wrote to memory of 2572	2664	91086ef2437049d4cfcb66149acf0d95.exe	33
PID 2664 wrote to memory of 2572	2664	91086ef2437049d4cfcb66149acf0d95.exe	33
PID 2664 wrote to memory of 2572	2664	91086ef2437049d4cfcb66149acf0d95.exe	33
PID 2740 wrote to memory of 2968	2740	Windows Security.exe	35
PID 2740 wrote to memory of 2968	2740	Windows Security.exe	35
PID 2740 wrote to memory of 2968	2740	Windows Security.exe	35
PID 2740 wrote to memory of 2968	2740	Windows Security.exe	35
PID 2740 wrote to memory of 2968	2740	Windows Security.exe	35
PID 2740 wrote to memory of 2968	2740	Windows Security.exe	35
PID 2740 wrote to memory of 2968	2740	Windows Security.exe	35
PID 2740 wrote to memory of 2968	2740	Windows Security.exe	35
PID 2740 wrote to memory of 2968	2740	Windows Security.exe	35
PID 2968 wrote to memory of 2116	2968	Windows Security.exe	36
PID 2968 wrote to memory of 2116	2968	Windows Security.exe	36
PID 2968 wrote to memory of 2116	2968	Windows Security.exe	36
PID 2968 wrote to memory of 2116	2968	Windows Security.exe	36
PID 2664 wrote to memory of 2668	2664	91086ef2437049d4cfcb66149acf0d95.exe	38
PID 2664 wrote to memory of 2668	2664	91086ef2437049d4cfcb66149acf0d95.exe	38
PID 2664 wrote to memory of 2668	2664	91086ef2437049d4cfcb66149acf0d95.exe	38
PID 2664 wrote to memory of 2668	2664	91086ef2437049d4cfcb66149acf0d95.exe	38
PID 2668 wrote to memory of 2448	2668	cmd.exe	40
PID 2668 wrote to memory of 2448	2668	cmd.exe	40
PID 2668 wrote to memory of 2448	2668	cmd.exe	40
PID 2668 wrote to memory of 2448	2668	cmd.exe	40
PID 2664 wrote to memory of 2088	2664	91086ef2437049d4cfcb66149acf0d95.exe	41
PID 2664 wrote to memory of 2088	2664	91086ef2437049d4cfcb66149acf0d95.exe	41
PID 2664 wrote to memory of 2088	2664	91086ef2437049d4cfcb66149acf0d95.exe	41
PID 2664 wrote to memory of 2088	2664	91086ef2437049d4cfcb66149acf0d95.exe	41

C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe
"C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3000
- C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe
  "C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe"
  2⤵
  - Modifies Windows Defender Real-time Protection settings
  - Loads dropped DLL
  - Windows security modification
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2664
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\91086ef2437049d4cfcb66149acf0d95.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2828
- - C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe
    "C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:2740
  - - C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe
      "C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:2968
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:2116
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2572
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2668
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
      4⤵
      PID:2448
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\dw95VFNQE48Q.bat" "
    3⤵
    PID:2088

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\CabD4BF.tmp

Filesize
65KB

MD5
ac05d27423a85adc1622c714f2cb6184

SHA1
b0fe2b1abddb97837ea0195be70ab2ff14d43198

SHA256
c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

SHA512
6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

Download Submit
C:\Users\Admin\AppData\Local\Temp\TarD56D.tmp

Filesize
171KB

MD5
9c0c641c06238516f27941aa1166d427

SHA1
64cd549fb8cf014fcd9312aa7a5b023847b6c977

SHA256
4276af3669a141a59388bc56a87f6614d9a9bdddf560636c264219a7eb11256f

SHA512
936ed0c0b0a7ff8e606b1cc4175a1f9b3699748ccbba1c3aff96203033d2e9edabf090e5148370df42fbfc4e31d7229493706ff24f19ff42ff7bef74a6baad06

Download Submit
C:\Users\Admin\AppData\Local\Temp\dw95VFNQE48Q.bat

Filesize
229B

MD5
c82815a3889b177969c53b7cabaa8b0a

SHA1
a335da405c5f2be89cbd68ac3bc6b14c56512a09

SHA256
ab9d2e01b7bde16741d03a9134a9ab9b89eab07ddd7244f21e33f52be2ab239f

SHA512
5367735a091d6ac25005fbcbd8f054ccf3d300ddd478d00cc0f639a4c5c4d2a0b14c9562c6ee7d527f787892679a84895ca22285354a8fc1c6d84c9c71bdb956

Download Submit
\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe

Filesize
653KB

MD5
91086ef2437049d4cfcb66149acf0d95

SHA1
ac9cfed7ccfcd8676b437e753abdf7fc06981f71

SHA256
1c5bb8ac1735f400b18f16ed5daab07575ba4aaedb4da31ca5cd89205bb40141

SHA512
effe216b30c6371065d467e585f95db5106c35376a8fe430880a4e965c3a7927fb0453945036b19a6e0e7ec3d4a1290eee6e2445b68cd748086082da29db8046

Download Submit
memory/2572-56-0x000000006E7A0000-0x000000006ED4B000-memory.dmp

Filesize
5.7MB

Download
memory/2572-54-0x0000000000850000-0x0000000000890000-memory.dmp

Filesize
256KB

Download
memory/2572-52-0x0000000000850000-0x0000000000890000-memory.dmp

Filesize
256KB

Download
memory/2572-51-0x0000000000850000-0x0000000000890000-memory.dmp

Filesize
256KB

Download
memory/2572-50-0x000000006E7A0000-0x000000006ED4B000-memory.dmp

Filesize
5.7MB

Download
memory/2572-49-0x000000006E7A0000-0x000000006ED4B000-memory.dmp

Filesize
5.7MB

Download
memory/2664-53-0x00000000741B0000-0x000000007489E000-memory.dmp

Filesize
6.9MB

Download
memory/2664-5-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2664-17-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2664-18-0x00000000741B0000-0x000000007489E000-memory.dmp

Filesize
6.9MB

Download
memory/2664-19-0x0000000000810000-0x0000000000850000-memory.dmp

Filesize
256KB

Download
memory/2664-119-0x00000000741B0000-0x000000007489E000-memory.dmp

Filesize
6.9MB

Download
memory/2664-57-0x0000000000810000-0x0000000000850000-memory.dmp

Filesize
256KB

Download
memory/2664-15-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2664-7-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2664-8-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2664-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2664-9-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2664-12-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2740-29-0x0000000000CD0000-0x0000000000D10000-memory.dmp

Filesize
256KB

Download
memory/2740-27-0x00000000741B0000-0x000000007489E000-memory.dmp

Filesize
6.9MB

Download
memory/2740-28-0x0000000001340000-0x00000000013EA000-memory.dmp

Filesize
680KB

Download
memory/2740-48-0x00000000741B0000-0x000000007489E000-memory.dmp

Filesize
6.9MB

Download
memory/2968-36-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2968-44-0x00000000741B0000-0x000000007489E000-memory.dmp

Filesize
6.9MB

Download
memory/2968-45-0x0000000004AC0000-0x0000000004B00000-memory.dmp

Filesize
256KB

Download
memory/2968-120-0x00000000741B0000-0x000000007489E000-memory.dmp

Filesize
6.9MB

Download
memory/2968-121-0x0000000004AC0000-0x0000000004B00000-memory.dmp

Filesize
256KB

Download
memory/3000-0-0x0000000000E20000-0x0000000000ECA000-memory.dmp

Filesize
680KB

Download
memory/3000-4-0x0000000000390000-0x000000000039A000-memory.dmp

Filesize
40KB

Download
memory/3000-2-0x0000000000340000-0x0000000000380000-memory.dmp

Filesize
256KB

Download
memory/3000-1-0x0000000074230000-0x000000007491E000-memory.dmp

Filesize
6.9MB

Download
memory/3000-14-0x0000000074230000-0x000000007491E000-memory.dmp

Filesize
6.9MB

Download