quasar | 5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74

Analysis

max time kernel
148s
max time network
149s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
03-11-2024 14:38

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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 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2712-8-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar
behavioral1/memory/2712-6-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar
behavioral1/memory/2712-4-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Executes dropped EXE 4 IoCs

Processes:

downloads.exedownloads.exedownloads.exedownloads.exe

pid	Process
2212	downloads.exe
2860	downloads.exe
900	downloads.exe
1904	downloads.exe

Loads dropped DLL 4 IoCs

Processes:

5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exedownloads.exe

pid	Process
2712	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
2212	downloads.exe
2212	downloads.exe
2212	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
2	ip-api.com

Suspicious use of SetThreadContext 6 IoCs

Processes:

5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exedownloads.exe

description	pid	Process	procid_target
PID 2668 set thread context of 2712	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	30
PID 2668 set thread context of 2684	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	31
PID 2668 set thread context of 2692	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	32
PID 2212 set thread context of 2860	2212	downloads.exe	37
PID 2212 set thread context of 900	2212	downloads.exe	38
PID 2212 set thread context of 1904	2212	downloads.exe	39

System Location Discovery: System Language Discovery 1 TTPs 10 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:

downloads.exeschtasks.exe5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exeschtasks.exedownloads.exedownloads.exedownloads.exe5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe

description	ioc	Process
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	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	downloads.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	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.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
2652	schtasks.exe
1788	schtasks.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exedownloads.exedownloads.exe

description	pid	Process
Token: SeDebugPrivilege	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
Token: SeDebugPrivilege	2712	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
Token: SeDebugPrivilege	2212	downloads.exe
Token: SeDebugPrivilege	900	downloads.exe

Suspicious use of WriteProcessMemory 64 IoCs

Processes:

5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exedownloads.exedownloads.exe

description	pid	Process	procid_target
PID 2668 wrote to memory of 2712	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	30
PID 2668 wrote to memory of 2712	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	30
PID 2668 wrote to memory of 2712	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	30
PID 2668 wrote to memory of 2712	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	30
PID 2668 wrote to memory of 2712	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	30
PID 2668 wrote to memory of 2712	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	30
PID 2668 wrote to memory of 2712	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	30
PID 2668 wrote to memory of 2712	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	30
PID 2668 wrote to memory of 2712	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	30
PID 2668 wrote to memory of 2684	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	31
PID 2668 wrote to memory of 2684	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	31
PID 2668 wrote to memory of 2684	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	31
PID 2668 wrote to memory of 2684	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	31
PID 2668 wrote to memory of 2684	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	31
PID 2668 wrote to memory of 2684	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	31
PID 2668 wrote to memory of 2684	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	31
PID 2668 wrote to memory of 2684	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	31
PID 2668 wrote to memory of 2684	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	31
PID 2668 wrote to memory of 2692	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	32
PID 2668 wrote to memory of 2692	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	32
PID 2668 wrote to memory of 2692	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	32
PID 2668 wrote to memory of 2692	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	32
PID 2668 wrote to memory of 2692	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	32
PID 2668 wrote to memory of 2692	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	32
PID 2668 wrote to memory of 2692	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	32
PID 2668 wrote to memory of 2692	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	32
PID 2668 wrote to memory of 2692	2668	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	32
PID 2712 wrote to memory of 2652	2712	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	34
PID 2712 wrote to memory of 2652	2712	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	34
PID 2712 wrote to memory of 2652	2712	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	34
PID 2712 wrote to memory of 2652	2712	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	34
PID 2712 wrote to memory of 2212	2712	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	36
PID 2712 wrote to memory of 2212	2712	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	36
PID 2712 wrote to memory of 2212	2712	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	36
PID 2712 wrote to memory of 2212	2712	5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe	36
PID 2212 wrote to memory of 2860	2212	downloads.exe	37
PID 2212 wrote to memory of 2860	2212	downloads.exe	37
PID 2212 wrote to memory of 2860	2212	downloads.exe	37
PID 2212 wrote to memory of 2860	2212	downloads.exe	37
PID 2212 wrote to memory of 2860	2212	downloads.exe	37
PID 2212 wrote to memory of 2860	2212	downloads.exe	37
PID 2212 wrote to memory of 2860	2212	downloads.exe	37
PID 2212 wrote to memory of 2860	2212	downloads.exe	37
PID 2212 wrote to memory of 2860	2212	downloads.exe	37
PID 2212 wrote to memory of 900	2212	downloads.exe	38
PID 2212 wrote to memory of 900	2212	downloads.exe	38
PID 2212 wrote to memory of 900	2212	downloads.exe	38
PID 2212 wrote to memory of 900	2212	downloads.exe	38
PID 2212 wrote to memory of 900	2212	downloads.exe	38
PID 2212 wrote to memory of 900	2212	downloads.exe	38
PID 2212 wrote to memory of 900	2212	downloads.exe	38
PID 2212 wrote to memory of 900	2212	downloads.exe	38
PID 2212 wrote to memory of 900	2212	downloads.exe	38
PID 2212 wrote to memory of 1904	2212	downloads.exe	39
PID 2212 wrote to memory of 1904	2212	downloads.exe	39
PID 2212 wrote to memory of 1904	2212	downloads.exe	39
PID 2212 wrote to memory of 1904	2212	downloads.exe	39
PID 2212 wrote to memory of 1904	2212	downloads.exe	39
PID 2212 wrote to memory of 1904	2212	downloads.exe	39
PID 2212 wrote to memory of 1904	2212	downloads.exe	39
PID 2212 wrote to memory of 1904	2212	downloads.exe	39
PID 2212 wrote to memory of 1904	2212	downloads.exe	39
PID 900 wrote to memory of 1788	900	downloads.exe	40
PID 900 wrote to memory of 1788	900	downloads.exe	40

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:2668
- C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
  C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2712
- - 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:2652
- - C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe
    "C:\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2212
  - - 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
      PID:2860
  - - 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:900
    - - 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:1788
  - - 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
      PID:1904
- C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
  C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2684
- C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
  C:\Users\Admin\AppData\Local\Temp\5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74.exe
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2692

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

\Users\Admin\AppData\Roaming\downloadupdates\downloads.exe

Filesize
774KB

MD5
e30f4b28319c4d5d490a36c80698c7c5

SHA1
89199dbf12c0ca07992cedcd50ab366c04568fc5

SHA256
5d0cbef4443db02296dfb37c7a9bce838b4beae8f726e6d3f3a60e6dd4691a74

SHA512
3f2440155e22eb8c6ef359fe17755ffa270da6a6cec99ff31d23766390212895dc27e9aa55ee0b6b5720a96088dbd7be372a3ebf34fff4b756410c70fd52d353

Download Submit
memory/2212-29-0x00000000009E0000-0x0000000000AAA000-memory.dmp

Filesize
808KB

Download
memory/2668-21-0x0000000074750000-0x0000000074E3E000-memory.dmp

Filesize
6.9MB

Download
memory/2668-3-0x0000000074750000-0x0000000074E3E000-memory.dmp

Filesize
6.9MB

Download
memory/2668-0-0x000000007475E000-0x000000007475F000-memory.dmp

Filesize
4KB

Download
memory/2668-2-0x00000000048C0000-0x00000000049AE000-memory.dmp

Filesize
952KB

Download
memory/2668-1-0x0000000001340000-0x000000000140A000-memory.dmp

Filesize
808KB

Download
memory/2684-20-0x0000000074750000-0x0000000074E3E000-memory.dmp

Filesize
6.9MB

Download
memory/2684-22-0x0000000074750000-0x0000000074E3E000-memory.dmp

Filesize
6.9MB

Download
memory/2712-8-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2712-6-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2712-4-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download
memory/2712-19-0x0000000074750000-0x0000000074E3E000-memory.dmp

Filesize
6.9MB

Download
memory/2712-30-0x0000000074750000-0x0000000074E3E000-memory.dmp

Filesize
6.9MB

Download