quasar | 676a40f2c599ffe574343860e190a7c293ade8e32cd83b66f6ff6f8d4c0b3a53

Analysis

max time kernel
150s
max time network
120s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
18-12-2024 06:45

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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-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\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
behavioral1/files/0x00070000000186fd-8.dat	family_quasar
behavioral1/memory/2164-11-0x0000000000D50000-0x0000000001074000-memory.dmp	family_quasar
behavioral1/files/0x0007000000018728-46.dat	family_quasar

Executes dropped EXE 8 IoCs

pid	Process
2164	kys.exe
1812	icsys.icn.exe
2580	explorer.exe
2904	spoolsv.exe
2744	victim.exe
2804	svchost.exe
1396	spoolsv.exe
2664	explorer.exe

Loads dropped DLL 7 IoCs

pid	Process
2196	kys.exe
2196	kys.exe
1812	icsys.icn.exe
2580	explorer.exe
2904	spoolsv.exe
2804	svchost.exe
2744	victim.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\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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\resources\\svchost.exe RO"	explorer.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
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	svchost.exe
File opened for modification	C:\Windows\SysWOW64\explorer.exe	explorer.exe
File created	C:\Windows\system32\SubDir\victim.exe	kys.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 11 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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	victim.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.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	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.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	explorer.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 4 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2568	schtasks.exe
2672	schtasks.exe
1940	schtasks.exe
1552	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2196	kys.exe
2196	kys.exe
2196	kys.exe
2196	kys.exe
2196	kys.exe
2196	kys.exe
2196	kys.exe
2196	kys.exe
2196	kys.exe
2196	kys.exe
2196	kys.exe
2196	kys.exe
2196	kys.exe
2196	kys.exe
2196	kys.exe
2196	kys.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
2580	explorer.exe
2580	explorer.exe
2580	explorer.exe
2580	explorer.exe
2580	explorer.exe
2580	explorer.exe
2580	explorer.exe
2580	explorer.exe
2580	explorer.exe
2580	explorer.exe
2580	explorer.exe
2580	explorer.exe
2580	explorer.exe
2580	explorer.exe
2580	explorer.exe
2580	explorer.exe
2804	svchost.exe
2804	svchost.exe
2804	svchost.exe
2804	svchost.exe
2804	svchost.exe
2804	svchost.exe
2804	svchost.exe
2804	svchost.exe
2804	svchost.exe
2804	svchost.exe
2804	svchost.exe
2804	svchost.exe
2744	victim.exe
2804	svchost.exe
2804	svchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
2580	explorer.exe
2804	svchost.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2164	kys.exe

Suspicious use of SetWindowsHookEx 16 IoCs

pid	Process
2196	kys.exe
2196	kys.exe
1812	icsys.icn.exe
1812	icsys.icn.exe
2580	explorer.exe
2580	explorer.exe
2904	spoolsv.exe
2904	spoolsv.exe
2804	svchost.exe
2744	victim.exe
2804	svchost.exe
2744	victim.exe
1396	spoolsv.exe
1396	spoolsv.exe
2664	explorer.exe
2664	explorer.exe

Suspicious use of WriteProcessMemory 51 IoCs

description	pid	Process	procid_target
PID 2196 wrote to memory of 2164	2196	kys.exe	30
PID 2196 wrote to memory of 2164	2196	kys.exe	30
PID 2196 wrote to memory of 2164	2196	kys.exe	30
PID 2196 wrote to memory of 2164	2196	kys.exe	30
PID 2164 wrote to memory of 2568	2164	kys.exe	31
PID 2164 wrote to memory of 2568	2164	kys.exe	31
PID 2164 wrote to memory of 2568	2164	kys.exe	31
PID 2196 wrote to memory of 1812	2196	kys.exe	33
PID 2196 wrote to memory of 1812	2196	kys.exe	33
PID 2196 wrote to memory of 1812	2196	kys.exe	33
PID 2196 wrote to memory of 1812	2196	kys.exe	33
PID 1812 wrote to memory of 2580	1812	icsys.icn.exe	34
PID 1812 wrote to memory of 2580	1812	icsys.icn.exe	34
PID 1812 wrote to memory of 2580	1812	icsys.icn.exe	34
PID 1812 wrote to memory of 2580	1812	icsys.icn.exe	34
PID 2580 wrote to memory of 2904	2580	explorer.exe	35
PID 2580 wrote to memory of 2904	2580	explorer.exe	35
PID 2580 wrote to memory of 2904	2580	explorer.exe	35
PID 2580 wrote to memory of 2904	2580	explorer.exe	35
PID 2164 wrote to memory of 2744	2164	kys.exe	36
PID 2164 wrote to memory of 2744	2164	kys.exe	36
PID 2164 wrote to memory of 2744	2164	kys.exe	36
PID 2164 wrote to memory of 2744	2164	kys.exe	36
PID 2904 wrote to memory of 2804	2904	spoolsv.exe	37
PID 2904 wrote to memory of 2804	2904	spoolsv.exe	37
PID 2904 wrote to memory of 2804	2904	spoolsv.exe	37
PID 2904 wrote to memory of 2804	2904	spoolsv.exe	37
PID 2804 wrote to memory of 1396	2804	svchost.exe	38
PID 2804 wrote to memory of 1396	2804	svchost.exe	38
PID 2804 wrote to memory of 1396	2804	svchost.exe	38
PID 2804 wrote to memory of 1396	2804	svchost.exe	38
PID 2744 wrote to memory of 2664	2744	victim.exe	39
PID 2744 wrote to memory of 2664	2744	victim.exe	39
PID 2744 wrote to memory of 2664	2744	victim.exe	39
PID 2744 wrote to memory of 2664	2744	victim.exe	39
PID 2580 wrote to memory of 2052	2580	explorer.exe	40
PID 2580 wrote to memory of 2052	2580	explorer.exe	40
PID 2580 wrote to memory of 2052	2580	explorer.exe	40
PID 2580 wrote to memory of 2052	2580	explorer.exe	40
PID 2804 wrote to memory of 2672	2804	svchost.exe	41
PID 2804 wrote to memory of 2672	2804	svchost.exe	41
PID 2804 wrote to memory of 2672	2804	svchost.exe	41
PID 2804 wrote to memory of 2672	2804	svchost.exe	41
PID 2804 wrote to memory of 1940	2804	svchost.exe	45
PID 2804 wrote to memory of 1940	2804	svchost.exe	45
PID 2804 wrote to memory of 1940	2804	svchost.exe	45
PID 2804 wrote to memory of 1940	2804	svchost.exe	45
PID 2804 wrote to memory of 1552	2804	svchost.exe	47
PID 2804 wrote to memory of 1552	2804	svchost.exe	47
PID 2804 wrote to memory of 1552	2804	svchost.exe	47
PID 2804 wrote to memory of 1552	2804	svchost.exe	47

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⤵
- Loads dropped DLL
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2196
- \??\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:2164
- - 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:2568
- - C:\Windows\system32\SubDir\victim.exe
    "C:\Windows\system32\SubDir\victim.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2744
  - - \??\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:2664
- C:\Windows\Resources\Themes\icsys.icn.exe
  C:\Windows\Resources\Themes\icsys.icn.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1812
- - \??\c:\windows\resources\themes\explorer.exe
    c:\windows\resources\themes\explorer.exe
    3⤵
    - Modifies visiblity of hidden/system files in Explorer
    - Executes dropped EXE
    - Loads dropped DLL
    - Adds Run key to start application
    - Drops file in System32 directory
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2580
  - - \??\c:\windows\resources\spoolsv.exe
      c:\windows\resources\spoolsv.exe SE
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Drops file in Windows directory
      System Location Discovery: System Language Discovery
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:2904
    - - \??\c:\windows\resources\svchost.exe
        
        c:\windows\resources\svchost.exe
        5⤵
        Modifies visiblity of hidden/system files in Explorer
        Executes dropped EXE
        Loads dropped DLL
        Adds Run key to start application
        Drops file in System32 directory
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:2804
      - \??\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:1396
      - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /create /tn "svchost" /tr "c:\windows\resources\svchost.exe" /sc daily /st 06:47 /f
        6⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:2672
      - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /create /tn "svchost" /tr "c:\windows\resources\svchost.exe" /sc daily /st 06:48 /f
        6⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:1940
      - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /create /tn "svchost" /tr "c:\windows\resources\svchost.exe" /sc daily /st 06:49 /f
        6⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:1552
  - - C:\Windows\Explorer.exe
      C:\Windows\Explorer.exe
      4⤵
      PID:2052

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\explorer.exe

Filesize
135KB

MD5
795ae8f64b75bcfc220839aa846b8eb6

SHA1
3b44d6ecddc74ef9dfeeed4ff5c07aa1ab6e672c

SHA256
aa3741f7c2e9aea34972ea8494ec949ec105014624552d50dfdc5cdbba06b1b1

SHA512
32e1a0dd920c199ef245f1f199d084bf5633df0476331f4aaece72a957f96bb99d6e21bdde8f0370afaf9e5af7c2cf35abfc5687adb0416e3c8545df9de682d6

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

Filesize
135KB

MD5
92abe5e2ed00ab4f9d2a3d5c4f1fd44c

SHA1
738b210f04c423d86d021890cbb3b66dc5bdd695

SHA256
45bbb5ff77d8bb78061d0e75d25e70d4d8fbc5f1bd63ef6aa8b6a4abef7c6bed

SHA512
1f43a9752dbbef4b470a3e29ad289bc2869b61ceef8f5a892e24d9d50aa4fea3c9b183527c87da8f9315227db54db15c135099de44b000b02feec2579151b18f

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

Filesize
3.2MB

MD5
0515143005b3e92fe50594bc1e30af7b

SHA1
1f565728bcc13bf1e49760c98bd96e15dacb42fc

SHA256
676a40f2c599ffe574343860e190a7c293ade8e32cd83b66f6ff6f8d4c0b3a53

SHA512
e813c528c5f1ff3b447b3701f3eb947d6697bf2880a39256d5c0e118cdebdb653651611ae3a03586871bce8d375c6035fdca1a7c8370605d3f68313928bbae3c

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

Filesize
135KB

MD5
20c2fe9a730ef6e2ee732d4b854f125b

SHA1
69236089a1291f96a66cc0d007944aff1697afdc

SHA256
95060d4832274d9f65af5111acb2602a2458c085a51b2ad585aa274cfe6cec27

SHA512
0123843886af98dcfbfb7563ba840efa53d4c565c4c11b62716d8c1a23d4678a1089d54f058e16790b73549761f3e0209845dc88cf8aa18dc73f44b2d37a78cc

Download Submit
\Windows\Resources\spoolsv.exe

Filesize
135KB

MD5
899ba353f7c2680709dea8c6f2061c35

SHA1
072ea43691a46b22c89b031aae28df5f7b1551f6

SHA256
5844a506446e36200299cc7120977272b0d9a848bfd2e5b45eea7ea38adb76c6

SHA512
3b0d6c02d7484c58455ba7aa76fab0da507c1c6f9f1610c4c1d4462d6e170ecb82133b00e5c59a818b31e2b64d9775aeb07adffc74c3611691f787c992f3a433

Download Submit
memory/1396-74-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1812-79-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1812-27-0x00000000003D0000-0x00000000003EF000-memory.dmp

Filesize
124KB

Download
memory/2164-12-0x000007FEF5490000-0x000007FEF5E7C000-memory.dmp

Filesize
9.9MB

Download
memory/2164-11-0x0000000000D50000-0x0000000001074000-memory.dmp

Filesize
3.1MB

Download
memory/2164-10-0x000007FEF5493000-0x000007FEF5494000-memory.dmp

Filesize
4KB

Download
memory/2164-56-0x000007FEF5490000-0x000007FEF5E7C000-memory.dmp

Filesize
9.9MB

Download
memory/2196-16-0x0000000000270000-0x000000000028F000-memory.dmp

Filesize
124KB

Download
memory/2196-0-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2196-78-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2580-80-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2664-75-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2744-69-0x00000000003C0000-0x00000000003DF000-memory.dmp

Filesize
124KB

Download
memory/2744-77-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2804-64-0x0000000001C20000-0x0000000001C3F000-memory.dmp

Filesize
124KB

Download
memory/2804-81-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2804-82-0x0000000001C20000-0x0000000001C3F000-memory.dmp

Filesize
124KB

Download
memory/2904-76-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download