quasar | 5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74

Analysis

max time kernel
147s
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
03-11-2024 14:31

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General

Target

5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
Size

774KB
MD5

e30f4b28319c4d5d490a36c80698c7c5
SHA1

89199dbf12c0ca07992cedcd50ab366c04568fc5
SHA256

5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74
SHA512

3f2440155e22eb8c6ef359fe17755ffa270da6a6cec99ff31d23766390212895dc27e9aa55ee0b6b5720a96088dbd7be372a3ebf34fff4b756410c70fd52d353
SSDEEP

12288:rKnhyuMP6/bbH+NzvZ9KSDdBrxqzdxD0XGfnyr7Ha2/Mg45omnFjkCC1htlJI8XO:8YP6XeRKShcDD0X6nqHa2A5DF8tnI8+

Score

10^/10

quasar vtroy discovery spyware trojan

Malware Config

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/2596-5-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Executes dropped EXE 4 IoCs

Processes:

downloads.exedownloads.exedownloads.exedownloads.exe

pid	Process
3628	downloads.exe
4916	downloads.exe
1076	downloads.exe
3444	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
15	ip-api.com

Suspicious use of SetThreadContext 6 IoCs

Processes:

5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exedownloads.exe

description	pid	Process	procid_target
PID 3596 set thread context of 2596	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	87
PID 3596 set thread context of 712	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	88
PID 3596 set thread context of 2184	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	89
PID 3628 set thread context of 4916	3628	downloads.exe	100
PID 3628 set thread context of 1076	3628	downloads.exe	101
PID 3628 set thread context of 3444	3628	downloads.exe	103

Program crash 3 IoCs

Processes:

WerFault.exeWerFault.exeWerFault.exe

pid	pid_target	Process	procid_target
624	712	WerFault.exe	88
3512	4916	WerFault.exe	100
1412	3444	WerFault.exe	103

System Location Discovery: System Language Discovery 1 TTPs 7 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:

5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exeschtasks.exedownloads.exedownloads.exeschtasks.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.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

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
2904	schtasks.exe
1184	schtasks.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exedownloads.exedownloads.exe

description	pid	Process
Token: SeDebugPrivilege	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
Token: SeDebugPrivilege	2596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
Token: SeDebugPrivilege	3628	downloads.exe
Token: SeDebugPrivilege	1076	downloads.exe

Suspicious use of UnmapMainImage 1 IoCs

Processes:

5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe

pid	Process
712	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe

Suspicious use of WriteProcessMemory 57 IoCs

Processes:

5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exedownloads.exedownloads.exe

description	pid	Process	procid_target
PID 3596 wrote to memory of 2596	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	87
PID 3596 wrote to memory of 2596	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	87
PID 3596 wrote to memory of 2596	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	87
PID 3596 wrote to memory of 2596	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	87
PID 3596 wrote to memory of 2596	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	87
PID 3596 wrote to memory of 2596	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	87
PID 3596 wrote to memory of 2596	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	87
PID 3596 wrote to memory of 2596	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	87
PID 3596 wrote to memory of 712	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	88
PID 3596 wrote to memory of 712	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	88
PID 3596 wrote to memory of 712	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	88
PID 3596 wrote to memory of 712	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	88
PID 3596 wrote to memory of 712	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	88
PID 3596 wrote to memory of 712	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	88
PID 3596 wrote to memory of 712	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	88
PID 3596 wrote to memory of 712	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	88
PID 3596 wrote to memory of 2184	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	89
PID 3596 wrote to memory of 2184	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	89
PID 3596 wrote to memory of 2184	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	89
PID 3596 wrote to memory of 2184	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	89
PID 3596 wrote to memory of 2184	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	89
PID 3596 wrote to memory of 2184	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	89
PID 3596 wrote to memory of 2184	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	89
PID 3596 wrote to memory of 2184	3596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	89
PID 2596 wrote to memory of 2904	2596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	94
PID 2596 wrote to memory of 2904	2596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	94
PID 2596 wrote to memory of 2904	2596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	94
PID 2596 wrote to memory of 3628	2596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	96
PID 2596 wrote to memory of 3628	2596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	96
PID 2596 wrote to memory of 3628	2596	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	96
PID 3628 wrote to memory of 4916	3628	downloads.exe	100
PID 3628 wrote to memory of 4916	3628	downloads.exe	100
PID 3628 wrote to memory of 4916	3628	downloads.exe	100
PID 3628 wrote to memory of 4916	3628	downloads.exe	100
PID 3628 wrote to memory of 4916	3628	downloads.exe	100
PID 3628 wrote to memory of 4916	3628	downloads.exe	100
PID 3628 wrote to memory of 4916	3628	downloads.exe	100
PID 3628 wrote to memory of 4916	3628	downloads.exe	100
PID 3628 wrote to memory of 1076	3628	downloads.exe	101
PID 3628 wrote to memory of 1076	3628	downloads.exe	101
PID 3628 wrote to memory of 1076	3628	downloads.exe	101
PID 3628 wrote to memory of 1076	3628	downloads.exe	101
PID 3628 wrote to memory of 1076	3628	downloads.exe	101
PID 3628 wrote to memory of 1076	3628	downloads.exe	101
PID 3628 wrote to memory of 1076	3628	downloads.exe	101
PID 3628 wrote to memory of 1076	3628	downloads.exe	101
PID 3628 wrote to memory of 3444	3628	downloads.exe	103
PID 3628 wrote to memory of 3444	3628	downloads.exe	103
PID 3628 wrote to memory of 3444	3628	downloads.exe	103
PID 3628 wrote to memory of 3444	3628	downloads.exe	103
PID 3628 wrote to memory of 3444	3628	downloads.exe	103
PID 3628 wrote to memory of 3444	3628	downloads.exe	103
PID 3628 wrote to memory of 3444	3628	downloads.exe	103
PID 3628 wrote to memory of 3444	3628	downloads.exe	103
PID 1076 wrote to memory of 1184	1076	downloads.exe	107
PID 1076 wrote to memory of 1184	1076	downloads.exe	107
PID 1076 wrote to memory of 1184	1076	downloads.exe	107

C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
"C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3596
- C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
  C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2596
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "cssrse.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2904
- - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
    "C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:3628
  - - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      4⤵
      Executes dropped EXE
      PID:4916
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 4916 -s 80
        5⤵
        Program crash
        
        PID:3512
  - - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1076
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "cssrse.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe" /rl HIGHEST /f
        5⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:1184
  - - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
      4⤵
      Executes dropped EXE
      PID:3444
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 3444 -s 80
        5⤵
        Program crash
        
        PID:1412
- C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
  C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
  2⤵
  - Suspicious use of UnmapMainImage
  PID:712
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 712 -s 12
    3⤵
    - Program crash
    PID:624
- C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
  C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2184

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 712 -ip 712
1⤵
PID:2672

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 4916 -ip 4916
1⤵
PID:4404

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 512 -p 3444 -ip 3444
1⤵
PID:736

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

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\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe.log

Filesize
522B

MD5
0f39d6b9afc039d81ff31f65cbf76826

SHA1
8356d04fe7bba2695d59b6caf5c59f58f3e1a6d8

SHA256
ea16b63ffd431ebf658b903710b6b3a9b8a2eb6814eee3a53b707a342780315d

SHA512
5bad54adb2e32717ef6275f49e2f101dd7e2011c9be14a32e5c29051e8a3f608cbd0b44ac4855ab21e790cb7a5d84c5f69de087074fd01b35259d34d07f5aaf9

Download Submit
C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe

Filesize
774KB

MD5
e30f4b28319c4d5d490a36c80698c7c5

SHA1
89199dbf12c0ca07992cedcd50ab366c04568fc5

SHA256
5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74

SHA512
3f2440155e22eb8c6ef359fe17755ffa270da6a6cec99ff31d23766390212895dc27e9aa55ee0b6b5720a96088dbd7be372a3ebf34fff4b756410c70fd52d353

Download Submit
memory/1076-33-0x0000000006DB0000-0x0000000006DBA000-memory.dmp

Filesize
40KB

Download
memory/2184-18-0x0000000074DE0000-0x0000000075590000-memory.dmp

Filesize
7.7MB

Download
memory/2184-11-0x0000000005CA0000-0x0000000006244000-memory.dmp

Filesize
5.6MB

Download
memory/2184-16-0x00000000058C0000-0x0000000005926000-memory.dmp

Filesize
408KB

Download
memory/2184-14-0x0000000074DE0000-0x0000000075590000-memory.dmp

Filesize
7.7MB

Download
memory/2184-10-0x0000000074DE0000-0x0000000075590000-memory.dmp

Filesize
7.7MB

Download
memory/2184-12-0x0000000005820000-0x00000000058B2000-memory.dmp

Filesize
584KB

Download
memory/2596-15-0x0000000074DE0000-0x0000000075590000-memory.dmp

Filesize
7.7MB

Download
memory/2596-9-0x0000000074DE0000-0x0000000075590000-memory.dmp

Filesize
7.7MB

Download
memory/2596-5-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2596-19-0x0000000005EF0000-0x0000000005F02000-memory.dmp

Filesize
72KB

Download
memory/2596-20-0x0000000006570000-0x00000000065AC000-memory.dmp

Filesize
240KB

Download
memory/2596-25-0x0000000074DE0000-0x0000000075590000-memory.dmp

Filesize
7.7MB

Download
memory/3596-13-0x0000000074DE0000-0x0000000075590000-memory.dmp

Filesize
7.7MB

Download
memory/3596-4-0x0000000004FB0000-0x000000000504C000-memory.dmp

Filesize
624KB

Download
memory/3596-3-0x0000000074DE0000-0x0000000075590000-memory.dmp

Filesize
7.7MB

Download
memory/3596-0-0x0000000074DEE000-0x0000000074DEF000-memory.dmp

Filesize
4KB

Download
memory/3596-2-0x0000000007330000-0x000000000741E000-memory.dmp

Filesize
952KB

Download
memory/3596-1-0x0000000000480000-0x000000000054A000-memory.dmp

Filesize
808KB

Download