quasar | c7a070b7e06000af25f9fe5f44cfacfd4ac4a02371369267ad10cf3beaed8d4b

Analysis

max time kernel
140s
max time network
152s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
21-12-2023 22:13

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General

Target

0fdee64f4eb558b0d6e1a5a568095e40.exe
Size

880KB
MD5

0fdee64f4eb558b0d6e1a5a568095e40
SHA1

55ca1696afa36ab5f36d3c2944a03bb988335d97
SHA256

c7a070b7e06000af25f9fe5f44cfacfd4ac4a02371369267ad10cf3beaed8d4b
SHA512

ddf3de5d0f69a29818f683c46ccd70891455f8781e46cf1ac37b740b67e74eea4408920ef3a54878707c81b74b2dc13337838a6521880a0c9f912cc7251bfe44
SSDEEP

24576:zhOjdWkJhngpn9kNsMwbMgkK589joyhkIS:zgjdbDnKkK3MgkK56

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 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/2284-10-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2284-12-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2284-16-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2284-18-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2284-20-0x0000000000400000-0x000000000048C000-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:

0fdee64f4eb558b0d6e1a5a568095e40.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection	0fdee64f4eb558b0d6e1a5a568095e40.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	0fdee64f4eb558b0d6e1a5a568095e40.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	0fdee64f4eb558b0d6e1a5a568095e40.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	0fdee64f4eb558b0d6e1a5a568095e40.exe

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

Quasar payload 5 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2284-10-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2284-12-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2284-16-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2284-18-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2284-20-0x0000000000400000-0x000000000048C000-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
2524	Windows Security.exe
2400	Windows Security.exe

Loads dropped DLL 1 IoCs

Processes:

0fdee64f4eb558b0d6e1a5a568095e40.exe

pid	Process
2284	0fdee64f4eb558b0d6e1a5a568095e40.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

0fdee64f4eb558b0d6e1a5a568095e40.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features	0fdee64f4eb558b0d6e1a5a568095e40.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	0fdee64f4eb558b0d6e1a5a568095e40.exe

Adds Run key to start application 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

0fdee64f4eb558b0d6e1a5a568095e40.exe0fdee64f4eb558b0d6e1a5a568095e40.exeWindows Security.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2444714103-3190537498-3629098939-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\jEWDfCdAGM = "C:\\Users\\Admin\\AppData\\Roaming\\EcGASfXzFi\\SgBSNdRiPF.exe"	0fdee64f4eb558b0d6e1a5a568095e40.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2444714103-3190537498-3629098939-1000\Software\Microsoft\Windows\CurrentVersion\Run\Windows Update Service = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\0fdee64f4eb558b0d6e1a5a568095e40.exe\""	0fdee64f4eb558b0d6e1a5a568095e40.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2444714103-3190537498-3629098939-1000\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
2	ip-api.com

Suspicious use of SetThreadContext 2 IoCs

Processes:

0fdee64f4eb558b0d6e1a5a568095e40.exeWindows Security.exe

description	pid	Process	procid_target
PID 2008 set thread context of 2284	2008	0fdee64f4eb558b0d6e1a5a568095e40.exe	28
PID 2524 set thread context of 2400	2524	Windows Security.exe	34

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
2592	schtasks.exe
1348	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

powershell.exe0fdee64f4eb558b0d6e1a5a568095e40.exe

pid	Process
2068	powershell.exe
2284	0fdee64f4eb558b0d6e1a5a568095e40.exe
2284	0fdee64f4eb558b0d6e1a5a568095e40.exe
2284	0fdee64f4eb558b0d6e1a5a568095e40.exe
2284	0fdee64f4eb558b0d6e1a5a568095e40.exe
2284	0fdee64f4eb558b0d6e1a5a568095e40.exe
2284	0fdee64f4eb558b0d6e1a5a568095e40.exe
2284	0fdee64f4eb558b0d6e1a5a568095e40.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

0fdee64f4eb558b0d6e1a5a568095e40.exeWindows Security.exepowershell.exe

description	pid	Process
Token: SeDebugPrivilege	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe
Token: SeDebugPrivilege	2400	Windows Security.exe
Token: SeDebugPrivilege	2400	Windows Security.exe
Token: SeDebugPrivilege	2068	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Windows Security.exe

pid	Process
2400	Windows Security.exe

Suspicious use of WriteProcessMemory 50 IoCs

Processes:

0fdee64f4eb558b0d6e1a5a568095e40.exe0fdee64f4eb558b0d6e1a5a568095e40.exeWindows Security.exeWindows Security.execmd.execmd.exe

description	pid	Process	procid_target
PID 2008 wrote to memory of 2284	2008	0fdee64f4eb558b0d6e1a5a568095e40.exe	28
PID 2008 wrote to memory of 2284	2008	0fdee64f4eb558b0d6e1a5a568095e40.exe	28
PID 2008 wrote to memory of 2284	2008	0fdee64f4eb558b0d6e1a5a568095e40.exe	28
PID 2008 wrote to memory of 2284	2008	0fdee64f4eb558b0d6e1a5a568095e40.exe	28
PID 2008 wrote to memory of 2284	2008	0fdee64f4eb558b0d6e1a5a568095e40.exe	28
PID 2008 wrote to memory of 2284	2008	0fdee64f4eb558b0d6e1a5a568095e40.exe	28
PID 2008 wrote to memory of 2284	2008	0fdee64f4eb558b0d6e1a5a568095e40.exe	28
PID 2008 wrote to memory of 2284	2008	0fdee64f4eb558b0d6e1a5a568095e40.exe	28
PID 2008 wrote to memory of 2284	2008	0fdee64f4eb558b0d6e1a5a568095e40.exe	28
PID 2284 wrote to memory of 2592	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	30
PID 2284 wrote to memory of 2592	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	30
PID 2284 wrote to memory of 2592	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	30
PID 2284 wrote to memory of 2592	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	30
PID 2284 wrote to memory of 2524	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	32
PID 2284 wrote to memory of 2524	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	32
PID 2284 wrote to memory of 2524	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	32
PID 2284 wrote to memory of 2524	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	32
PID 2524 wrote to memory of 2400	2524	Windows Security.exe	34
PID 2524 wrote to memory of 2400	2524	Windows Security.exe	34
PID 2524 wrote to memory of 2400	2524	Windows Security.exe	34
PID 2524 wrote to memory of 2400	2524	Windows Security.exe	34
PID 2524 wrote to memory of 2400	2524	Windows Security.exe	34
PID 2524 wrote to memory of 2400	2524	Windows Security.exe	34
PID 2524 wrote to memory of 2400	2524	Windows Security.exe	34
PID 2524 wrote to memory of 2400	2524	Windows Security.exe	34
PID 2524 wrote to memory of 2400	2524	Windows Security.exe	34
PID 2400 wrote to memory of 1348	2400	Windows Security.exe	35
PID 2400 wrote to memory of 1348	2400	Windows Security.exe	35
PID 2400 wrote to memory of 1348	2400	Windows Security.exe	35
PID 2400 wrote to memory of 1348	2400	Windows Security.exe	35
PID 2284 wrote to memory of 2068	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	33
PID 2284 wrote to memory of 2068	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	33
PID 2284 wrote to memory of 2068	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	33
PID 2284 wrote to memory of 2068	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	33
PID 2284 wrote to memory of 2428	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	40
PID 2284 wrote to memory of 2428	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	40
PID 2284 wrote to memory of 2428	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	40
PID 2284 wrote to memory of 2428	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	40
PID 2428 wrote to memory of 2264	2428	cmd.exe	42
PID 2428 wrote to memory of 2264	2428	cmd.exe	42
PID 2428 wrote to memory of 2264	2428	cmd.exe	42
PID 2428 wrote to memory of 2264	2428	cmd.exe	42
PID 2284 wrote to memory of 776	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	43
PID 2284 wrote to memory of 776	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	43
PID 2284 wrote to memory of 776	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	43
PID 2284 wrote to memory of 776	2284	0fdee64f4eb558b0d6e1a5a568095e40.exe	43
PID 776 wrote to memory of 1560	776	cmd.exe	45
PID 776 wrote to memory of 1560	776	cmd.exe	45
PID 776 wrote to memory of 1560	776	cmd.exe	45
PID 776 wrote to memory of 1560	776	cmd.exe	45

C:\Users\Admin\AppData\Local\Temp\0fdee64f4eb558b0d6e1a5a568095e40.exe
"C:\Users\Admin\AppData\Local\Temp\0fdee64f4eb558b0d6e1a5a568095e40.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2008
- C:\Users\Admin\AppData\Local\Temp\0fdee64f4eb558b0d6e1a5a568095e40.exe
  "C:\Users\Admin\AppData\Local\Temp\0fdee64f4eb558b0d6e1a5a568095e40.exe"
  2⤵
  - Modifies Windows Defender Real-time Protection settings
  - Loads dropped DLL
  - Windows security modification
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2284
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Update Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\0fdee64f4eb558b0d6e1a5a568095e40.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2592
- - 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:2524
  - - 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:2400
    - - 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:1348
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2068
- - 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:2428
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
      4⤵
      PID:2264
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\ySvfmp68PJwz.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:776
  - - C:\Windows\SysWOW64\chcp.com
      chcp 65001
      4⤵
      PID:1560

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\CabDD75.tmp

Filesize
65KB

MD5
ac05d27423a85adc1622c714f2cb6184

SHA1
b0fe2b1abddb97837ea0195be70ab2ff14d43198

SHA256
c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

SHA512
6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

Download Submit
C:\Users\Admin\AppData\Local\Temp\TarDD98.tmp

Filesize
171KB

MD5
9c0c641c06238516f27941aa1166d427

SHA1
64cd549fb8cf014fcd9312aa7a5b023847b6c977

SHA256
4276af3669a141a59388bc56a87f6614d9a9bdddf560636c264219a7eb11256f

SHA512
936ed0c0b0a7ff8e606b1cc4175a1f9b3699748ccbba1c3aff96203033d2e9edabf090e5148370df42fbfc4e31d7229493706ff24f19ff42ff7bef74a6baad06

Download Submit
C:\Users\Admin\AppData\Local\Temp\ySvfmp68PJwz.bat

Filesize
229B

MD5
884474e3d30d4257c7c25fa6baab9cc3

SHA1
7c1c7a8a2f2aee690ff8a8284d4d86664a374f55

SHA256
675988b831e5662497bfcfa019352c32be4de4aee384d9c454b5517c123bebba

SHA512
148c48ff0f7722ebf1ee89b8eff5a62fef7f8a14ef31ae88eb639fa690dab3352e371e4fc74c26ff076a42b4d871cec4c5297a825d3214539d2fa53f83db86ab

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

Filesize
880KB

MD5
0fdee64f4eb558b0d6e1a5a568095e40

SHA1
55ca1696afa36ab5f36d3c2944a03bb988335d97

SHA256
c7a070b7e06000af25f9fe5f44cfacfd4ac4a02371369267ad10cf3beaed8d4b

SHA512
ddf3de5d0f69a29818f683c46ccd70891455f8781e46cf1ac37b740b67e74eea4408920ef3a54878707c81b74b2dc13337838a6521880a0c9f912cc7251bfe44

Download Submit
memory/2008-3-0x0000000000400000-0x000000000040C000-memory.dmp

Filesize
48KB

Download
memory/2008-5-0x0000000000640000-0x000000000064A000-memory.dmp

Filesize
40KB

Download
memory/2008-21-0x0000000074DB0000-0x000000007549E000-memory.dmp

Filesize
6.9MB

Download
memory/2008-2-0x00000000003B0000-0x00000000003F0000-memory.dmp

Filesize
256KB

Download
memory/2008-1-0x0000000074DB0000-0x000000007549E000-memory.dmp

Filesize
6.9MB

Download
memory/2008-0-0x0000000001130000-0x0000000001212000-memory.dmp

Filesize
904KB

Download
memory/2068-60-0x000000006F890000-0x000000006FE3B000-memory.dmp

Filesize
5.7MB

Download
memory/2068-59-0x0000000002760000-0x00000000027A0000-memory.dmp

Filesize
256KB

Download
memory/2068-57-0x0000000002760000-0x00000000027A0000-memory.dmp

Filesize
256KB

Download
memory/2068-56-0x000000006F890000-0x000000006FE3B000-memory.dmp

Filesize
5.7MB

Download
memory/2068-55-0x000000006F890000-0x000000006FE3B000-memory.dmp

Filesize
5.7MB

Download
memory/2284-25-0x0000000074DB0000-0x000000007549E000-memory.dmp

Filesize
6.9MB

Download
memory/2284-14-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2284-22-0x0000000074DB0000-0x000000007549E000-memory.dmp

Filesize
6.9MB

Download
memory/2284-122-0x0000000074DB0000-0x000000007549E000-memory.dmp

Filesize
6.9MB

Download
memory/2284-6-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2284-8-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2284-10-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2284-12-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2284-16-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2284-23-0x0000000004BF0000-0x0000000004C30000-memory.dmp

Filesize
256KB

Download
memory/2284-20-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2284-18-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2400-58-0x0000000074DB0000-0x000000007549E000-memory.dmp

Filesize
6.9MB

Download
memory/2400-51-0x0000000004A40000-0x0000000004A80000-memory.dmp

Filesize
256KB

Download
memory/2400-49-0x0000000074DB0000-0x000000007549E000-memory.dmp

Filesize
6.9MB

Download
memory/2400-41-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2524-50-0x0000000074DB0000-0x000000007549E000-memory.dmp

Filesize
6.9MB

Download
memory/2524-34-0x0000000000710000-0x0000000000750000-memory.dmp

Filesize
256KB

Download
memory/2524-32-0x0000000074DB0000-0x000000007549E000-memory.dmp

Filesize
6.9MB

Download
memory/2524-33-0x0000000000300000-0x00000000003E2000-memory.dmp

Filesize
904KB

Download