quasar | 676a40f2c599ffe574343860e190a7c293ade8e32cd83b66f6ff6f8d4c0b3a53

Analysis

max time kernel
150s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
18-12-2024 06:33

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General

Target

kys.exe
Size

3.2MB
MD5

0515143005b3e92fe50594bc1e30af7b
SHA1

1f565728bcc13bf1e49760c98bd96e15dacb42fc
SHA256

676a40f2c599ffe574343860e190a7c293ade8e32cd83b66f6ff6f8d4c0b3a53
SHA512

e813c528c5f1ff3b447b3701f3eb947d6697bf2880a39256d5c0e118cdebdb653651611ae3a03586871bce8d375c6035fdca1a7c8370605d3f68313928bbae3c
SSDEEP

49152:tevXI22SsaNYfdPBldt698dBcjH3c0TbRSLoGd7/THHB72eh2NTA:UvY22SsaNYfdPBldt6+dBcjH3c0SZ

Score

10^/10

quasar victim-hacked discovery evasion persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

victim-hacked

192.168.100.2:4444

Mutex

16229cd1-6d24-490c-9eb9-35319229cc03

Attributes

encryption_key
6B74F0C858B7E90573D4E97997F2A082B9781250
install_name
victim.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Microsoft Service
subdirectory
SubDir

Signatures

Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	svchost.exe

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 3 IoCs

resource	yara_rule
behavioral2/files/0x0008000000023be3-7.dat	family_quasar
behavioral2/memory/1856-10-0x0000000000A90000-0x0000000000DB4000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023be5-21.dat	family_quasar

Executes dropped EXE 8 IoCs

pid	Process
1856	kys.exe
920	icsys.icn.exe
5044	victim.exe
3608	explorer.exe
2544	explorer.exe
2364	spoolsv.exe
4460	svchost.exe
1316	spoolsv.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\resources\\svchost.exe RO"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\resources\\themes\\explorer.exe RO"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\resources\\svchost.exe RO"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\resources\\themes\\explorer.exe RO"	explorer.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\victim.exe	kys.exe
File opened for modification	C:\Windows\system32\SubDir\victim.exe	kys.exe
File opened for modification	C:\Windows\system32\SubDir	kys.exe
File opened for modification	C:\Windows\SysWOW64\explorer.exe	explorer.exe
File opened for modification	C:\Windows\SysWOW64\explorer.exe	svchost.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Resources\tjud.exe	explorer.exe
File opened for modification	C:\Windows\Resources\Themes\icsys.icn.exe	kys.exe
File opened for modification	\??\c:\windows\resources\themes\explorer.exe	icsys.icn.exe
File opened for modification	\??\c:\windows\resources\spoolsv.exe	explorer.exe
File opened for modification	\??\c:\windows\resources\svchost.exe	spoolsv.exe

System Location Discovery: System Language Discovery 1 TTPs 8 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	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	kys.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icsys.icn.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	victim.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	explorer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	explorer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.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

pid	Process
772	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
2556	kys.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe
920	icsys.icn.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
3608	explorer.exe
4460	svchost.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1856	kys.exe

Suspicious use of SetWindowsHookEx 16 IoCs

pid	Process
2556	kys.exe
2556	kys.exe
920	icsys.icn.exe
920	icsys.icn.exe
5044	victim.exe
5044	victim.exe
3608	explorer.exe
3608	explorer.exe
2544	explorer.exe
2544	explorer.exe
2364	spoolsv.exe
2364	spoolsv.exe
4460	svchost.exe
4460	svchost.exe
1316	spoolsv.exe
1316	spoolsv.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 2556 wrote to memory of 1856	2556	kys.exe	83
PID 2556 wrote to memory of 1856	2556	kys.exe	83
PID 1856 wrote to memory of 772	1856	kys.exe	84
PID 1856 wrote to memory of 772	1856	kys.exe	84
PID 2556 wrote to memory of 920	2556	kys.exe	86
PID 2556 wrote to memory of 920	2556	kys.exe	86
PID 2556 wrote to memory of 920	2556	kys.exe	86
PID 1856 wrote to memory of 5044	1856	kys.exe	87
PID 1856 wrote to memory of 5044	1856	kys.exe	87
PID 1856 wrote to memory of 5044	1856	kys.exe	87
PID 920 wrote to memory of 3608	920	icsys.icn.exe	88
PID 920 wrote to memory of 3608	920	icsys.icn.exe	88
PID 920 wrote to memory of 3608	920	icsys.icn.exe	88
PID 5044 wrote to memory of 2544	5044	victim.exe	89
PID 5044 wrote to memory of 2544	5044	victim.exe	89
PID 5044 wrote to memory of 2544	5044	victim.exe	89
PID 3608 wrote to memory of 2364	3608	explorer.exe	90
PID 3608 wrote to memory of 2364	3608	explorer.exe	90
PID 3608 wrote to memory of 2364	3608	explorer.exe	90
PID 2364 wrote to memory of 4460	2364	spoolsv.exe	91
PID 2364 wrote to memory of 4460	2364	spoolsv.exe	91
PID 2364 wrote to memory of 4460	2364	spoolsv.exe	91
PID 4460 wrote to memory of 1316	4460	svchost.exe	92
PID 4460 wrote to memory of 1316	4460	svchost.exe	92
PID 4460 wrote to memory of 1316	4460	svchost.exe	92

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\kys.exe
"C:\Users\Admin\AppData\Local\Temp\kys.exe"
1⤵
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2556
- \??\c:\users\admin\appdata\local\temp\kys.exe
  c:\users\admin\appdata\local\temp\kys.exe
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1856
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Microsoft Service" /sc ONLOGON /tr "C:\Windows\system32\SubDir\victim.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:772
- - C:\Windows\system32\SubDir\victim.exe
    "C:\Windows\system32\SubDir\victim.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:5044
  - - \??\c:\windows\resources\themes\explorer.exe
      c:\windows\resources\themes\explorer.exe
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of SetWindowsHookEx
      PID:2544
- C:\Windows\Resources\Themes\icsys.icn.exe
  C:\Windows\Resources\Themes\icsys.icn.exe
  2⤵
  - Executes dropped EXE
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:920
- - \??\c:\windows\resources\themes\explorer.exe
    c:\windows\resources\themes\explorer.exe
    3⤵
    - Modifies visiblity of hidden/system files in Explorer
    - Executes dropped EXE
    - Adds Run key to start application
    - Drops file in System32 directory
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3608
  - - \??\c:\windows\resources\spoolsv.exe
      c:\windows\resources\spoolsv.exe SE
      4⤵
      Executes dropped EXE
      Drops file in Windows directory
      System Location Discovery: System Language Discovery
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:2364
    - - \??\c:\windows\resources\svchost.exe
        
        c:\windows\resources\svchost.exe
        5⤵
        Modifies visiblity of hidden/system files in Explorer
        Executes dropped EXE
        Adds Run key to start application
        Drops file in System32 directory
        System Location Discovery: System Language Discovery
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:4460
      - \??\c:\windows\resources\spoolsv.exe
        
        c:\windows\resources\spoolsv.exe PR
        6⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        
        PID:1316

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

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\Temp\kys.exe

Filesize
3.1MB

MD5
5def20bc149e979f4c18e238edb01874

SHA1
813b5f3403652337ebf51b36f7c35c17a567786f

SHA256
6a98d500eab158f232d41cc190cb13f96749f818995d3bc01477f4231d7c7254

SHA512
fb51725d4367db8de825893235c34f6b1533f0a4cf25feac66efefa0c1d33a60d3723692cc9e00b4e0e032972e83e6b1f84d858284f1f1b0160e4e6c7e08bcfd

Download Submit
C:\Windows\Resources\Themes\icsys.icn.exe

Filesize
135KB

MD5
20c2fe9a730ef6e2ee732d4b854f125b

SHA1
69236089a1291f96a66cc0d007944aff1697afdc

SHA256
95060d4832274d9f65af5111acb2602a2458c085a51b2ad585aa274cfe6cec27

SHA512
0123843886af98dcfbfb7563ba840efa53d4c565c4c11b62716d8c1a23d4678a1089d54f058e16790b73549761f3e0209845dc88cf8aa18dc73f44b2d37a78cc

Download Submit
C:\Windows\Resources\spoolsv.exe

Filesize
135KB

MD5
82d9d8d2e5e9d0ab3c86caab4ecfec19

SHA1
bd9875dfe5c07229f178bd1c9ecfb7f6cd213a13

SHA256
5139d87f72cf9faa5ff69416e799265bcda2d36068d35232e88ca4ee8d3777f6

SHA512
5e15cfc9604faaf12fcb971c7b265635f113f1211d3a3f47499d4cda422e3f863c6a8cd21d4970e50e128f391e56a046b1a29301fbcaa8ac2d0b8954844a9740

Download Submit
C:\Windows\Resources\svchost.exe

Filesize
135KB

MD5
5a4e0482b4bd377ec85c8fdf3d65732f

SHA1
0cb47f140fa5e258b31b45cf04ee4d9f9895424f

SHA256
b448a7da0cde84dbd0dc2ced34bdd016aef437a89fbf64a21861948146b54184

SHA512
bff891ae8195073c43e04583cbdb4346ebb6d6f44c63b81e7880545f300b27357df31eb3fbf33b7b8198f2e8eed6fc1ecc0e98b796ab92360f716082c098d1a7

Download Submit
C:\Windows\System32\SubDir\victim.exe

Filesize
3.2MB

MD5
0515143005b3e92fe50594bc1e30af7b

SHA1
1f565728bcc13bf1e49760c98bd96e15dacb42fc

SHA256
676a40f2c599ffe574343860e190a7c293ade8e32cd83b66f6ff6f8d4c0b3a53

SHA512
e813c528c5f1ff3b447b3701f3eb947d6697bf2880a39256d5c0e118cdebdb653651611ae3a03586871bce8d375c6035fdca1a7c8370605d3f68313928bbae3c

Download Submit
\??\c:\windows\resources\themes\explorer.exe

Filesize
135KB

MD5
e55d621762f1ef6069637ac780aac7b5

SHA1
1d2ed6d16f63ecb3f60c8a219a8a84882d2af7d7

SHA256
c7ea517f90685ed9978d776edffc25c8cde9e4deb75adaac2eb489cd718f3cf1

SHA512
4d302a9c0cec37ce1b5976285d88d0e155cf12a3a4e52290a4f8505c6319a5a7338757fdbc3d3c253a1edd2506ccb298d5d246424e77af286801bfc0f906b9d9

Download Submit
memory/920-64-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1316-62-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1856-11-0x00007FFE236D0000-0x00007FFE24191000-memory.dmp

Filesize
10.8MB

Download
memory/1856-9-0x00007FFE236D3000-0x00007FFE236D5000-memory.dmp

Filesize
8KB

Download
memory/1856-31-0x00007FFE236D0000-0x00007FFE24191000-memory.dmp

Filesize
10.8MB

Download
memory/1856-10-0x0000000000A90000-0x0000000000DB4000-memory.dmp

Filesize
3.1MB

Download
memory/2364-63-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2544-46-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2556-0-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2556-65-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3608-32-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3608-66-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4460-67-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/5044-45-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download