quasar | 5b11f30be6e3bfb808c25d07b492cfa12840fd0efa795d8af397feba045d1c59

Analysis

max time kernel
161s
max time network
169s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
07-01-2024 14:44

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General

Target

4942e9c13479bc1a62bdb07b23474e3c.exe
Size

639KB
MD5

4942e9c13479bc1a62bdb07b23474e3c
SHA1

d7a7283939a2fa4506b47fa809431b9cc4d2559e
SHA256

5b11f30be6e3bfb808c25d07b492cfa12840fd0efa795d8af397feba045d1c59
SHA512

8c8edd299922fcfa100e3e725d1b09259a86e41546361273c386177a3e2a765ffc76169a5b9d142efb4c5335bee3805c1f908c7f4edae0f0a33f2631a037eb59
SSDEEP

12288:66bJhnrd2Qsm/+/dnGz7O0Y244sMYcoFMVyMg+Yy1Wcwemn58WgxWM:6kJhngpn9kNsMwbMgkK58WgQM

Score

10^/10

quasar venomrat sep05 evasion persistence rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

SEP05

23.105.131.187:7812

Mutex

VNM_MUTEX_ea14HLQ5adxyrFdD2X

Attributes

encryption_key
jUWfdDb1toPE0KAlGJWH
install_name
Windows Security.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Update Service
subdirectory
Windows Security Update

Signatures

Contains code to disable Windows Defender 1 IoCs

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

Processes:

resource	yara_rule
behavioral2/memory/3068-9-0x0000000000400000-0x000000000048C000-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:

4942e9c13479bc1a62bdb07b23474e3c.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	4942e9c13479bc1a62bdb07b23474e3c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	4942e9c13479bc1a62bdb07b23474e3c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	4942e9c13479bc1a62bdb07b23474e3c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	4942e9c13479bc1a62bdb07b23474e3c.exe

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

Quasar payload 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3068-9-0x0000000000400000-0x000000000048C000-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
3640	Windows Security.exe
860	Windows Security.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

4942e9c13479bc1a62bdb07b23474e3c.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	4942e9c13479bc1a62bdb07b23474e3c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	4942e9c13479bc1a62bdb07b23474e3c.exe

Adds Run key to start application 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

4942e9c13479bc1a62bdb07b23474e3c.exe4942e9c13479bc1a62bdb07b23474e3c.exeWindows Security.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\jEWDfCdAGM = "C:\\Users\\Admin\\AppData\\Roaming\\EcGASfXzFi\\SgBSNdRiPF.exe"	4942e9c13479bc1a62bdb07b23474e3c.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Update Service = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\4942e9c13479bc1a62bdb07b23474e3c.exe\""	4942e9c13479bc1a62bdb07b23474e3c.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Update Service = "\"C:\\Users\\Admin\\AppData\\Roaming\\Windows Security Update\\Windows Security.exe\""	Windows Security.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
75	ip-api.com

Suspicious use of SetThreadContext 2 IoCs

Processes:

4942e9c13479bc1a62bdb07b23474e3c.exeWindows Security.exe

description	pid	Process	procid_target
PID 3856 set thread context of 3068	3856	4942e9c13479bc1a62bdb07b23474e3c.exe	99
PID 3640 set thread context of 860	3640	Windows Security.exe	112

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
3240	schtasks.exe
3116	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

4942e9c13479bc1a62bdb07b23474e3c.exepowershell.exe

pid	Process
3856	4942e9c13479bc1a62bdb07b23474e3c.exe
3856	4942e9c13479bc1a62bdb07b23474e3c.exe
380	powershell.exe
380	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

4942e9c13479bc1a62bdb07b23474e3c.exe4942e9c13479bc1a62bdb07b23474e3c.exepowershell.exeWindows Security.exe

description	pid	Process
Token: SeDebugPrivilege	3856	4942e9c13479bc1a62bdb07b23474e3c.exe
Token: SeDebugPrivilege	3068	4942e9c13479bc1a62bdb07b23474e3c.exe
Token: SeDebugPrivilege	380	powershell.exe
Token: SeDebugPrivilege	860	Windows Security.exe
Token: SeDebugPrivilege	860	Windows Security.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Windows Security.exe

pid	Process
860	Windows Security.exe

Suspicious use of WriteProcessMemory 31 IoCs

Processes:

4942e9c13479bc1a62bdb07b23474e3c.exe4942e9c13479bc1a62bdb07b23474e3c.exeWindows Security.exeWindows Security.exe

description	pid	Process	procid_target
PID 3856 wrote to memory of 2384	3856	4942e9c13479bc1a62bdb07b23474e3c.exe	98
PID 3856 wrote to memory of 2384	3856	4942e9c13479bc1a62bdb07b23474e3c.exe	98
PID 3856 wrote to memory of 2384	3856	4942e9c13479bc1a62bdb07b23474e3c.exe	98
PID 3856 wrote to memory of 3068	3856	4942e9c13479bc1a62bdb07b23474e3c.exe	99
PID 3856 wrote to memory of 3068	3856	4942e9c13479bc1a62bdb07b23474e3c.exe	99
PID 3856 wrote to memory of 3068	3856	4942e9c13479bc1a62bdb07b23474e3c.exe	99
PID 3856 wrote to memory of 3068	3856	4942e9c13479bc1a62bdb07b23474e3c.exe	99
PID 3856 wrote to memory of 3068	3856	4942e9c13479bc1a62bdb07b23474e3c.exe	99
PID 3856 wrote to memory of 3068	3856	4942e9c13479bc1a62bdb07b23474e3c.exe	99
PID 3856 wrote to memory of 3068	3856	4942e9c13479bc1a62bdb07b23474e3c.exe	99
PID 3856 wrote to memory of 3068	3856	4942e9c13479bc1a62bdb07b23474e3c.exe	99
PID 3068 wrote to memory of 3240	3068	4942e9c13479bc1a62bdb07b23474e3c.exe	106
PID 3068 wrote to memory of 3240	3068	4942e9c13479bc1a62bdb07b23474e3c.exe	106
PID 3068 wrote to memory of 3240	3068	4942e9c13479bc1a62bdb07b23474e3c.exe	106
PID 3068 wrote to memory of 3640	3068	4942e9c13479bc1a62bdb07b23474e3c.exe	109
PID 3068 wrote to memory of 3640	3068	4942e9c13479bc1a62bdb07b23474e3c.exe	109
PID 3068 wrote to memory of 3640	3068	4942e9c13479bc1a62bdb07b23474e3c.exe	109
PID 3068 wrote to memory of 380	3068	4942e9c13479bc1a62bdb07b23474e3c.exe	110
PID 3068 wrote to memory of 380	3068	4942e9c13479bc1a62bdb07b23474e3c.exe	110
PID 3068 wrote to memory of 380	3068	4942e9c13479bc1a62bdb07b23474e3c.exe	110
PID 3640 wrote to memory of 860	3640	Windows Security.exe	112
PID 3640 wrote to memory of 860	3640	Windows Security.exe	112
PID 3640 wrote to memory of 860	3640	Windows Security.exe	112
PID 3640 wrote to memory of 860	3640	Windows Security.exe	112
PID 3640 wrote to memory of 860	3640	Windows Security.exe	112
PID 3640 wrote to memory of 860	3640	Windows Security.exe	112
PID 3640 wrote to memory of 860	3640	Windows Security.exe	112
PID 3640 wrote to memory of 860	3640	Windows Security.exe	112
PID 860 wrote to memory of 3116	860	Windows Security.exe	114
PID 860 wrote to memory of 3116	860	Windows Security.exe	114
PID 860 wrote to memory of 3116	860	Windows Security.exe	114

C:\Users\Admin\AppData\Local\Temp\4942e9c13479bc1a62bdb07b23474e3c.exe
"C:\Users\Admin\AppData\Local\Temp\4942e9c13479bc1a62bdb07b23474e3c.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3856
- C:\Users\Admin\AppData\Local\Temp\4942e9c13479bc1a62bdb07b23474e3c.exe
  "C:\Users\Admin\AppData\Local\Temp\4942e9c13479bc1a62bdb07b23474e3c.exe"
  2⤵
  PID:2384
- C:\Users\Admin\AppData\Local\Temp\4942e9c13479bc1a62bdb07b23474e3c.exe
  "C:\Users\Admin\AppData\Local\Temp\4942e9c13479bc1a62bdb07b23474e3c.exe"
  2⤵
  - Modifies Windows Defender Real-time Protection settings
  - Windows security modification
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3068
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Update Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\4942e9c13479bc1a62bdb07b23474e3c.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:3240
- - C:\Users\Admin\AppData\Roaming\Windows Security Update\Windows Security.exe
    "C:\Users\Admin\AppData\Roaming\Windows Security Update\Windows Security.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:3640
  - - C:\Users\Admin\AppData\Roaming\Windows Security Update\Windows Security.exe
      "C:\Users\Admin\AppData\Roaming\Windows Security Update\Windows Security.exe"
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:860
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "Windows Update Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Security Update\Windows Security.exe" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:3116
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:380

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\4942e9c13479bc1a62bdb07b23474e3c.exe.log

Filesize
507B

MD5
8cf94b5356be60247d331660005941ec

SHA1
fdedb361f40f22cb6a086c808fc0056d4e421131

SHA256
52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0

SHA512
b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_gjwhovoi.ito.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\Windows Security Update\Windows Security.exe

Filesize
639KB

MD5
4942e9c13479bc1a62bdb07b23474e3c

SHA1
d7a7283939a2fa4506b47fa809431b9cc4d2559e

SHA256
5b11f30be6e3bfb808c25d07b492cfa12840fd0efa795d8af397feba045d1c59

SHA512
8c8edd299922fcfa100e3e725d1b09259a86e41546361273c386177a3e2a765ffc76169a5b9d142efb4c5335bee3805c1f908c7f4edae0f0a33f2631a037eb59

Download Submit
memory/380-55-0x00000000063A0000-0x00000000063EC000-memory.dmp

Filesize
304KB

Download
memory/380-56-0x0000000002980000-0x0000000002990000-memory.dmp

Filesize
64KB

Download
memory/380-79-0x0000000002980000-0x0000000002990000-memory.dmp

Filesize
64KB

Download
memory/380-78-0x0000000007670000-0x0000000007681000-memory.dmp

Filesize
68KB

Download
memory/380-76-0x00000000078D0000-0x0000000007966000-memory.dmp

Filesize
600KB

Download
memory/380-75-0x00000000076E0000-0x00000000076EA000-memory.dmp

Filesize
40KB

Download
memory/380-74-0x00000000075F0000-0x000000000760A000-memory.dmp

Filesize
104KB

Download
memory/380-36-0x0000000002980000-0x0000000002990000-memory.dmp

Filesize
64KB

Download
memory/380-72-0x0000000007540000-0x00000000075E3000-memory.dmp

Filesize
652KB

Download
memory/380-71-0x0000000006920000-0x000000000693E000-memory.dmp

Filesize
120KB

Download
memory/380-61-0x0000000070220000-0x000000007026C000-memory.dmp

Filesize
304KB

Download
memory/380-60-0x0000000006940000-0x0000000006972000-memory.dmp

Filesize
200KB

Download
memory/380-59-0x000000007FD00000-0x000000007FD10000-memory.dmp

Filesize
64KB

Download
memory/380-58-0x0000000002980000-0x0000000002990000-memory.dmp

Filesize
64KB

Download
memory/380-35-0x0000000004CF0000-0x0000000004D26000-memory.dmp

Filesize
216KB

Download
memory/380-57-0x0000000002980000-0x0000000002990000-memory.dmp

Filesize
64KB

Download
memory/380-37-0x0000000005360000-0x0000000005988000-memory.dmp

Filesize
6.2MB

Download
memory/380-53-0x0000000074F90000-0x0000000075740000-memory.dmp

Filesize
7.7MB

Download
memory/380-47-0x0000000005D90000-0x00000000060E4000-memory.dmp

Filesize
3.3MB

Download
memory/380-40-0x0000000005C00000-0x0000000005C66000-memory.dmp

Filesize
408KB

Download
memory/380-33-0x0000000074F90000-0x0000000075740000-memory.dmp

Filesize
7.7MB

Download
memory/380-39-0x0000000005320000-0x0000000005342000-memory.dmp

Filesize
136KB

Download
memory/380-54-0x00000000062D0000-0x00000000062EE000-memory.dmp

Filesize
120KB

Download
memory/380-73-0x0000000007CC0000-0x000000000833A000-memory.dmp

Filesize
6.5MB

Download
memory/860-34-0x0000000004EF0000-0x0000000004F00000-memory.dmp

Filesize
64KB

Download
memory/860-52-0x0000000074F90000-0x0000000075740000-memory.dmp

Filesize
7.7MB

Download
memory/860-32-0x0000000074F90000-0x0000000075740000-memory.dmp

Filesize
7.7MB

Download
memory/860-41-0x0000000006540000-0x000000000654A000-memory.dmp

Filesize
40KB

Download
memory/3068-17-0x0000000074F90000-0x0000000075740000-memory.dmp

Filesize
7.7MB

Download
memory/3068-15-0x00000000052F0000-0x0000000005356000-memory.dmp

Filesize
408KB

Download
memory/3068-19-0x0000000004FD0000-0x0000000004FE0000-memory.dmp

Filesize
64KB

Download
memory/3068-9-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/3068-12-0x0000000074F90000-0x0000000075740000-memory.dmp

Filesize
7.7MB

Download
memory/3068-18-0x0000000006460000-0x000000000649C000-memory.dmp

Filesize
240KB

Download
memory/3068-13-0x0000000004FD0000-0x0000000004FE0000-memory.dmp

Filesize
64KB

Download
memory/3068-16-0x0000000005420000-0x0000000005432000-memory.dmp

Filesize
72KB

Download
memory/3640-26-0x00000000057D0000-0x00000000057E0000-memory.dmp

Filesize
64KB

Download
memory/3640-25-0x0000000074F90000-0x0000000075740000-memory.dmp

Filesize
7.7MB

Download
memory/3640-31-0x0000000074F90000-0x0000000075740000-memory.dmp

Filesize
7.7MB

Download
memory/3856-0-0x0000000074F90000-0x0000000075740000-memory.dmp

Filesize
7.7MB

Download
memory/3856-14-0x0000000074F90000-0x0000000075740000-memory.dmp

Filesize
7.7MB

Download
memory/3856-2-0x0000000074F90000-0x0000000075740000-memory.dmp

Filesize
7.7MB

Download
memory/3856-1-0x0000000000D60000-0x0000000000E06000-memory.dmp

Filesize
664KB

Download
memory/3856-3-0x0000000005840000-0x0000000005850000-memory.dmp

Filesize
64KB

Download
memory/3856-4-0x00000000060C0000-0x0000000006664000-memory.dmp

Filesize
5.6MB

Download
memory/3856-8-0x0000000005830000-0x000000000583A000-memory.dmp

Filesize
40KB

Download
memory/3856-6-0x0000000005BB0000-0x0000000005C4C000-memory.dmp

Filesize
624KB

Download
memory/3856-5-0x0000000005B10000-0x0000000005BA2000-memory.dmp

Filesize
584KB

Download