quasar | bb1956f934dfbebe914a54e3445b5fbafac60e2672794a5e14ed4d1999d5aed2

General

Target

99862073a5f3df00516a49e3b78057b1.exe
Size

635KB
MD5

99862073a5f3df00516a49e3b78057b1
SHA1

46ac6d3ec2cb7d90d946a1470b5dff98eecee011
SHA256

bb1956f934dfbebe914a54e3445b5fbafac60e2672794a5e14ed4d1999d5aed2
SHA512

d0d248502db680f17ed2e8d750d809796320c41395284df0df9967fac852f6b39a05df33f5054cc8e45ba116c61eb2c112e3038a26b3fada34056e36f1400629
SSDEEP

12288:Z+ifBbFriWGl7gO03m4sRqJ2IOEEVR/7r+pKnoqsxWbvoyF3db6e0Rqs+8s7b:csBxrd4lA7OvR/fqKoqsxsvoyFtbsqsK

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

C2

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/2236-8-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2236-9-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2236-12-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2236-15-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2236-17-0x0000000000400000-0x000000000048C000-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:

99862073a5f3df00516a49e3b78057b1.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection	99862073a5f3df00516a49e3b78057b1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	99862073a5f3df00516a49e3b78057b1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	99862073a5f3df00516a49e3b78057b1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	99862073a5f3df00516a49e3b78057b1.exe

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

Quasar payload 5 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2236-8-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2236-9-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2236-12-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2236-15-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2236-17-0x0000000000400000-0x000000000048C000-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

2984 Windows Security.exe
2596 Windows Security.exe
Loads dropped DLL 2 IoCs

Processes:

99862073a5f3df00516a49e3b78057b1.exeWindows Security.exe

pid process

2236 99862073a5f3df00516a49e3b78057b1.exe
2984 Windows Security.exe

pid	process
2984	Windows Security.exe
2596	Windows Security.exe

pid	process
2236	99862073a5f3df00516a49e3b78057b1.exe
2984	Windows Security.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

99862073a5f3df00516a49e3b78057b1.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features	99862073a5f3df00516a49e3b78057b1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	99862073a5f3df00516a49e3b78057b1.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

99862073a5f3df00516a49e3b78057b1.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3601492379-692465709-652514833-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\QwXMCzbSAJ = "C:\\Users\\Admin\\AppData\\Roaming\\jXMDeSqECF\\tEWMqGdDFT.exe"	99862073a5f3df00516a49e3b78057b1.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

flow	ioc
2	ip-api.com

Suspicious use of SetThreadContext 2 IoCs

Processes:

99862073a5f3df00516a49e3b78057b1.exeWindows Security.exe

description	pid	process	target process
PID 1708 set thread context of 2236	1708	99862073a5f3df00516a49e3b78057b1.exe	99862073a5f3df00516a49e3b78057b1.exe
PID 2984 set thread context of 2596	2984	Windows Security.exe	Windows Security.exe

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

2768 schtasks.exe
2120 schtasks.exe

pid	process
2768	schtasks.exe
2120	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

powershell.exe99862073a5f3df00516a49e3b78057b1.exe

pid	process
2924	powershell.exe
2236	99862073a5f3df00516a49e3b78057b1.exe
2236	99862073a5f3df00516a49e3b78057b1.exe
2236	99862073a5f3df00516a49e3b78057b1.exe
2236	99862073a5f3df00516a49e3b78057b1.exe
2236	99862073a5f3df00516a49e3b78057b1.exe
2236	99862073a5f3df00516a49e3b78057b1.exe
2236	99862073a5f3df00516a49e3b78057b1.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

99862073a5f3df00516a49e3b78057b1.exeWindows Security.exepowershell.exe

description	pid	process
Token: SeDebugPrivilege	2236	99862073a5f3df00516a49e3b78057b1.exe
Token: SeDebugPrivilege	2596	Windows Security.exe
Token: SeDebugPrivilege	2924	powershell.exe
Token: SeDebugPrivilege	2596	Windows Security.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Windows Security.exe

pid process

2596 Windows Security.exe

pid	process
2596	Windows Security.exe

Suspicious use of WriteProcessMemory 46 IoCs

Processes:

99862073a5f3df00516a49e3b78057b1.exe99862073a5f3df00516a49e3b78057b1.exeWindows Security.exeWindows Security.execmd.exe

description	pid	process	target process
PID 1708 wrote to memory of 2236	1708	99862073a5f3df00516a49e3b78057b1.exe	99862073a5f3df00516a49e3b78057b1.exe
PID 1708 wrote to memory of 2236	1708	99862073a5f3df00516a49e3b78057b1.exe	99862073a5f3df00516a49e3b78057b1.exe
PID 1708 wrote to memory of 2236	1708	99862073a5f3df00516a49e3b78057b1.exe	99862073a5f3df00516a49e3b78057b1.exe
PID 1708 wrote to memory of 2236	1708	99862073a5f3df00516a49e3b78057b1.exe	99862073a5f3df00516a49e3b78057b1.exe
PID 1708 wrote to memory of 2236	1708	99862073a5f3df00516a49e3b78057b1.exe	99862073a5f3df00516a49e3b78057b1.exe
PID 1708 wrote to memory of 2236	1708	99862073a5f3df00516a49e3b78057b1.exe	99862073a5f3df00516a49e3b78057b1.exe
PID 1708 wrote to memory of 2236	1708	99862073a5f3df00516a49e3b78057b1.exe	99862073a5f3df00516a49e3b78057b1.exe
PID 1708 wrote to memory of 2236	1708	99862073a5f3df00516a49e3b78057b1.exe	99862073a5f3df00516a49e3b78057b1.exe
PID 1708 wrote to memory of 2236	1708	99862073a5f3df00516a49e3b78057b1.exe	99862073a5f3df00516a49e3b78057b1.exe
PID 2236 wrote to memory of 2768	2236	99862073a5f3df00516a49e3b78057b1.exe	schtasks.exe
PID 2236 wrote to memory of 2768	2236	99862073a5f3df00516a49e3b78057b1.exe	schtasks.exe
PID 2236 wrote to memory of 2768	2236	99862073a5f3df00516a49e3b78057b1.exe	schtasks.exe
PID 2236 wrote to memory of 2768	2236	99862073a5f3df00516a49e3b78057b1.exe	schtasks.exe
PID 2236 wrote to memory of 2984	2236	99862073a5f3df00516a49e3b78057b1.exe	Windows Security.exe
PID 2236 wrote to memory of 2984	2236	99862073a5f3df00516a49e3b78057b1.exe	Windows Security.exe
PID 2236 wrote to memory of 2984	2236	99862073a5f3df00516a49e3b78057b1.exe	Windows Security.exe
PID 2236 wrote to memory of 2984	2236	99862073a5f3df00516a49e3b78057b1.exe	Windows Security.exe
PID 2236 wrote to memory of 2924	2236	99862073a5f3df00516a49e3b78057b1.exe	powershell.exe
PID 2236 wrote to memory of 2924	2236	99862073a5f3df00516a49e3b78057b1.exe	powershell.exe
PID 2236 wrote to memory of 2924	2236	99862073a5f3df00516a49e3b78057b1.exe	powershell.exe
PID 2236 wrote to memory of 2924	2236	99862073a5f3df00516a49e3b78057b1.exe	powershell.exe
PID 2984 wrote to memory of 2596	2984	Windows Security.exe	Windows Security.exe
PID 2984 wrote to memory of 2596	2984	Windows Security.exe	Windows Security.exe
PID 2984 wrote to memory of 2596	2984	Windows Security.exe	Windows Security.exe
PID 2984 wrote to memory of 2596	2984	Windows Security.exe	Windows Security.exe
PID 2984 wrote to memory of 2596	2984	Windows Security.exe	Windows Security.exe
PID 2984 wrote to memory of 2596	2984	Windows Security.exe	Windows Security.exe
PID 2984 wrote to memory of 2596	2984	Windows Security.exe	Windows Security.exe
PID 2984 wrote to memory of 2596	2984	Windows Security.exe	Windows Security.exe
PID 2984 wrote to memory of 2596	2984	Windows Security.exe	Windows Security.exe
PID 2596 wrote to memory of 2120	2596	Windows Security.exe	schtasks.exe
PID 2596 wrote to memory of 2120	2596	Windows Security.exe	schtasks.exe
PID 2596 wrote to memory of 2120	2596	Windows Security.exe	schtasks.exe
PID 2596 wrote to memory of 2120	2596	Windows Security.exe	schtasks.exe
PID 2236 wrote to memory of 1980	2236	99862073a5f3df00516a49e3b78057b1.exe	cmd.exe
PID 2236 wrote to memory of 1980	2236	99862073a5f3df00516a49e3b78057b1.exe	cmd.exe
PID 2236 wrote to memory of 1980	2236	99862073a5f3df00516a49e3b78057b1.exe	cmd.exe
PID 2236 wrote to memory of 1980	2236	99862073a5f3df00516a49e3b78057b1.exe	cmd.exe
PID 1980 wrote to memory of 1852	1980	cmd.exe	cmd.exe
PID 1980 wrote to memory of 1852	1980	cmd.exe	cmd.exe
PID 1980 wrote to memory of 1852	1980	cmd.exe	cmd.exe
PID 1980 wrote to memory of 1852	1980	cmd.exe	cmd.exe
PID 2236 wrote to memory of 1704	2236	99862073a5f3df00516a49e3b78057b1.exe	cmd.exe
PID 2236 wrote to memory of 1704	2236	99862073a5f3df00516a49e3b78057b1.exe	cmd.exe
PID 2236 wrote to memory of 1704	2236	99862073a5f3df00516a49e3b78057b1.exe	cmd.exe
PID 2236 wrote to memory of 1704	2236	99862073a5f3df00516a49e3b78057b1.exe	cmd.exe

C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe
"C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1708
- C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe
  "C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.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:2236
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\99862073a5f3df00516a49e3b78057b1.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2768
- - 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:2984
  - - 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:2596
    - - 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:2120
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2924
- - 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:1980
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
      4⤵
      PID:1852
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\q9CyA7flFUN6.bat" "
    3⤵
    PID:1704

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

1

T1543

Windows Service

Scheduled Task/Job

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

1

T1543

Windows Service

Scheduled Task/Job

Defense Evasion

Impair Defenses

2

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\Cab4194.tmp

Filesize
65KB

MD5
ac05d27423a85adc1622c714f2cb6184

SHA1
b0fe2b1abddb97837ea0195be70ab2ff14d43198

SHA256
c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

SHA512
6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tar41A7.tmp

Filesize
171KB

MD5
9c0c641c06238516f27941aa1166d427

SHA1
64cd549fb8cf014fcd9312aa7a5b023847b6c977

SHA256
4276af3669a141a59388bc56a87f6614d9a9bdddf560636c264219a7eb11256f

SHA512
936ed0c0b0a7ff8e606b1cc4175a1f9b3699748ccbba1c3aff96203033d2e9edabf090e5148370df42fbfc4e31d7229493706ff24f19ff42ff7bef74a6baad06

Download Submit
C:\Users\Admin\AppData\Local\Temp\q9CyA7flFUN6.bat

Filesize
229B

MD5
c484896c4ffd429d9a08f37602dadd3a

SHA1
b620fec594ce8341c7616cf498e4d31a29373d5d

SHA256
d298e229ad9021ba55ea4cc729d20824a34ef4c1637d7ed203d772132a4092c5

SHA512
0fcc134bb813700e2109fcf15231d6a58c2891189ce09cef951138ec06fb86442d6991efbba8197f2f686b890c454ff971b3478ce0d450b26fdf1ddc2806424d

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

Filesize
635KB

MD5
99862073a5f3df00516a49e3b78057b1

SHA1
46ac6d3ec2cb7d90d946a1470b5dff98eecee011

SHA256
bb1956f934dfbebe914a54e3445b5fbafac60e2672794a5e14ed4d1999d5aed2

SHA512
d0d248502db680f17ed2e8d750d809796320c41395284df0df9967fac852f6b39a05df33f5054cc8e45ba116c61eb2c112e3038a26b3fada34056e36f1400629

Download Submit
memory/1708-14-0x0000000073DC0000-0x00000000744AE000-memory.dmp

Filesize
6.9MB

Download
memory/1708-1-0x0000000073DC0000-0x00000000744AE000-memory.dmp

Filesize
6.9MB

Download
memory/1708-2-0x0000000000300000-0x0000000000340000-memory.dmp

Filesize
256KB

Download
memory/1708-3-0x0000000000280000-0x000000000028A000-memory.dmp

Filesize
40KB

Download
memory/1708-5-0x00000000004E0000-0x00000000004EA000-memory.dmp

Filesize
40KB

Download
memory/1708-0-0x0000000001140000-0x00000000011E4000-memory.dmp

Filesize
656KB

Download
memory/2236-9-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2236-7-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2236-15-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2236-17-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2236-18-0x00000000736D0000-0x0000000073DBE000-memory.dmp

Filesize
6.9MB

Download
memory/2236-19-0x0000000000C50000-0x0000000000C90000-memory.dmp

Filesize
256KB

Download
memory/2236-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2236-12-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2236-118-0x00000000736D0000-0x0000000073DBE000-memory.dmp

Filesize
6.9MB

Download
memory/2236-6-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2236-8-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2596-119-0x00000000736D0000-0x0000000073DBE000-memory.dmp

Filesize
6.9MB

Download
memory/2596-46-0x00000000736D0000-0x0000000073DBE000-memory.dmp

Filesize
6.9MB

Download
memory/2596-47-0x0000000004D50000-0x0000000004D90000-memory.dmp

Filesize
256KB

Download
memory/2596-37-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2924-56-0x000000006E9D0000-0x000000006EF7B000-memory.dmp

Filesize
5.7MB

Download
memory/2924-51-0x0000000002A60000-0x0000000002AA0000-memory.dmp

Filesize
256KB

Download
memory/2924-53-0x0000000002A60000-0x0000000002AA0000-memory.dmp

Filesize
256KB

Download
memory/2924-54-0x000000006E9D0000-0x000000006EF7B000-memory.dmp

Filesize
5.7MB

Download
memory/2924-52-0x0000000002A60000-0x0000000002AA0000-memory.dmp

Filesize
256KB

Download
memory/2924-50-0x000000006E9D0000-0x000000006EF7B000-memory.dmp

Filesize
5.7MB

Download
memory/2984-45-0x00000000736D0000-0x0000000073DBE000-memory.dmp

Filesize
6.9MB

Download
memory/2984-29-0x0000000000EF0000-0x0000000000F30000-memory.dmp

Filesize
256KB

Download
memory/2984-28-0x0000000000FD0000-0x0000000001074000-memory.dmp

Filesize
656KB

Download
memory/2984-27-0x00000000736D0000-0x0000000073DBE000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads