quasar | b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c

Analysis

max time kernel
262s
max time network
357s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
30-11-2022 16:45

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General

Target

b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe
Size

630KB
MD5

c45c3dbe62846a145d90077e4d64fe00
SHA1

a9413e2aadb3d0fbf0168666c93c10a74fddcd8a
SHA256

b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c
SHA512

e7dd8538f223b2484c87cba7e1239d2c3ab85790a9ab5e9a31dfd3f8959982a39edcad838cb6aa5afe9348a344100ef1bc00c79d3a31d862726bbcfb098991ad
SSDEEP

12288:2oF8GNlD5ZS/1WEJOAqRSEM3Sy21LVbK89elrrJ5:aGKIDAEQSy2TbKuKN

Score

10^/10

quasar venomrat ajith evasion persistence rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

ajith

23.105.131.178:7812

Mutex

VNM_MUTEX_NdVd2sPSSqFdo7I35g

Attributes

encryption_key
jyerms3KOWmt3C9DBFuq
install_name
Windows Defender Security.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Update
subdirectory
SubDir

Signatures

Contains code to disable Windows Defender 7 IoCs

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

resource	yara_rule
behavioral1/memory/1924-60-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/1924-61-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/1924-63-0x0000000000486C4E-mapping.dmp	disable_win_def
behavioral1/memory/1924-62-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/1924-65-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/1924-67-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/1520-81-0x0000000000486C4E-mapping.dmp	disable_win_def

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

evasion trojan

Modify Registry

T1112

Modify Existing Service

T1031

Disabling Security Tools

T1089

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe

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

Quasar payload 7 IoCs

resource	yara_rule
behavioral1/memory/1924-60-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/1924-61-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/1924-63-0x0000000000486C4E-mapping.dmp	family_quasar
behavioral1/memory/1924-62-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/1924-65-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/1924-67-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/1520-81-0x0000000000486C4E-mapping.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

pid	Process
676	Windows Defender Security.exe
1520	Windows Defender Security.exe

Loads dropped DLL 1 IoCs

pid	Process
1924	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe

Adds Run key to start application 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1214520366-621468234-4062160515-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\Windows Services = "C:\\Users\\Admin\\AppData\\Roaming\\Windows Update Folder\\Windows Update.exe"	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1214520366-621468234-4062160515-1000\Software\Microsoft\Windows\CurrentVersion\Run\Windows Update = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe\""	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1214520366-621468234-4062160515-1000\Software\Microsoft\Windows\CurrentVersion\Run\Windows Update = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Windows Defender Security.exe\""	Windows Defender 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.

flow	ioc
2	ip-api.com

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 672 set thread context of 1924	672	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	28
PID 676 set thread context of 1520	676	Windows Defender Security.exe	33

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

T1053

pid	Process
816	schtasks.exe
1920	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1732	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1924	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe
Token: SeDebugPrivilege	1520	Windows Defender Security.exe
Token: SeDebugPrivilege	1520	Windows Defender Security.exe
Token: SeDebugPrivilege	1732	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1520	Windows Defender Security.exe

Suspicious use of WriteProcessMemory 34 IoCs

description	pid	Process	procid_target
PID 672 wrote to memory of 1924	672	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	28
PID 672 wrote to memory of 1924	672	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	28
PID 672 wrote to memory of 1924	672	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	28
PID 672 wrote to memory of 1924	672	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	28
PID 672 wrote to memory of 1924	672	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	28
PID 672 wrote to memory of 1924	672	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	28
PID 672 wrote to memory of 1924	672	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	28
PID 672 wrote to memory of 1924	672	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	28
PID 672 wrote to memory of 1924	672	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	28
PID 1924 wrote to memory of 816	1924	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	30
PID 1924 wrote to memory of 816	1924	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	30
PID 1924 wrote to memory of 816	1924	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	30
PID 1924 wrote to memory of 816	1924	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	30
PID 1924 wrote to memory of 676	1924	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	32
PID 1924 wrote to memory of 676	1924	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	32
PID 1924 wrote to memory of 676	1924	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	32
PID 1924 wrote to memory of 676	1924	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	32
PID 676 wrote to memory of 1520	676	Windows Defender Security.exe	33
PID 676 wrote to memory of 1520	676	Windows Defender Security.exe	33
PID 676 wrote to memory of 1520	676	Windows Defender Security.exe	33
PID 676 wrote to memory of 1520	676	Windows Defender Security.exe	33
PID 676 wrote to memory of 1520	676	Windows Defender Security.exe	33
PID 676 wrote to memory of 1520	676	Windows Defender Security.exe	33
PID 676 wrote to memory of 1520	676	Windows Defender Security.exe	33
PID 676 wrote to memory of 1520	676	Windows Defender Security.exe	33
PID 676 wrote to memory of 1520	676	Windows Defender Security.exe	33
PID 1924 wrote to memory of 1732	1924	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	34
PID 1924 wrote to memory of 1732	1924	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	34
PID 1924 wrote to memory of 1732	1924	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	34
PID 1924 wrote to memory of 1732	1924	b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe	34
PID 1520 wrote to memory of 1920	1520	Windows Defender Security.exe	35
PID 1520 wrote to memory of 1920	1520	Windows Defender Security.exe	35
PID 1520 wrote to memory of 1920	1520	Windows Defender Security.exe	35
PID 1520 wrote to memory of 1920	1520	Windows Defender Security.exe	35

C:\Users\Admin\AppData\Local\Temp\b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe
"C:\Users\Admin\AppData\Local\Temp\b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:672
- C:\Users\Admin\AppData\Local\Temp\b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe
  "C:\Users\Admin\AppData\Local\Temp\b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe"
  2⤵
  - Modifies Windows Defender Real-time Protection settings
  - Loads dropped DLL
  - Windows security modification
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1924
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:816
- - C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:676
  - - C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender 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:1520
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:1920
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1732

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Disabling Security Tools

T1089

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\Roaming\SubDir\Windows Defender Security.exe

Filesize
630KB

MD5
c45c3dbe62846a145d90077e4d64fe00

SHA1
a9413e2aadb3d0fbf0168666c93c10a74fddcd8a

SHA256
b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c

SHA512
e7dd8538f223b2484c87cba7e1239d2c3ab85790a9ab5e9a31dfd3f8959982a39edcad838cb6aa5afe9348a344100ef1bc00c79d3a31d862726bbcfb098991ad

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

Filesize
630KB

MD5
c45c3dbe62846a145d90077e4d64fe00

SHA1
a9413e2aadb3d0fbf0168666c93c10a74fddcd8a

SHA256
b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c

SHA512
e7dd8538f223b2484c87cba7e1239d2c3ab85790a9ab5e9a31dfd3f8959982a39edcad838cb6aa5afe9348a344100ef1bc00c79d3a31d862726bbcfb098991ad

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

Filesize
630KB

MD5
c45c3dbe62846a145d90077e4d64fe00

SHA1
a9413e2aadb3d0fbf0168666c93c10a74fddcd8a

SHA256
b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c

SHA512
e7dd8538f223b2484c87cba7e1239d2c3ab85790a9ab5e9a31dfd3f8959982a39edcad838cb6aa5afe9348a344100ef1bc00c79d3a31d862726bbcfb098991ad

Download Submit
\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe

Filesize
630KB

MD5
c45c3dbe62846a145d90077e4d64fe00

SHA1
a9413e2aadb3d0fbf0168666c93c10a74fddcd8a

SHA256
b70af2ccc8fd78d0cb69aa34cdb17c61d5024055787a2ddb97051834d5d2561c

SHA512
e7dd8538f223b2484c87cba7e1239d2c3ab85790a9ab5e9a31dfd3f8959982a39edcad838cb6aa5afe9348a344100ef1bc00c79d3a31d862726bbcfb098991ad

Download Submit
memory/672-55-0x0000000075531000-0x0000000075533000-memory.dmp

Filesize
8KB

Download
memory/672-56-0x0000000000200000-0x000000000020A000-memory.dmp

Filesize
40KB

Download
memory/672-54-0x0000000000CA0000-0x0000000000D44000-memory.dmp

Filesize
656KB

Download
memory/676-74-0x0000000001030000-0x00000000010D4000-memory.dmp

Filesize
656KB

Download
memory/1732-93-0x000000006ED40000-0x000000006F2EB000-memory.dmp

Filesize
5.7MB

Download
memory/1732-92-0x000000006ED40000-0x000000006F2EB000-memory.dmp

Filesize
5.7MB

Download
memory/1732-91-0x000000006ED40000-0x000000006F2EB000-memory.dmp

Filesize
5.7MB

Download
memory/1924-58-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/1924-57-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/1924-60-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/1924-61-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/1924-67-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/1924-62-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/1924-65-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download