quasar | 48f11a020991c4c5990a1431ef576a7c5e3f502da65fd12a834ad0108310fa79

General

Target

user.exe
Size

3.2MB
MD5

6c6b777d8e1ca16b3f2be293d1b417d4
SHA1

5a2e987253aa8c4606e5e8829c4ab823891226c2
SHA256

48f11a020991c4c5990a1431ef576a7c5e3f502da65fd12a834ad0108310fa79
SHA512

fc3698b5eeeb530a45cd58ecec8240a7411070dcb92dff0657e3e67e74b8a42069bd6c96532f2b1a3a33ac0118e17cdf40233abccea303da8ff1747e20b87913
SSDEEP

98304:zWfPAgtmK4/pkEIcqDGrTQBEju6shMcfjWxZkuT8A:KnDmTIBDKTq6s6cfjWX8A

Score

10^/10

quasar installs discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

installs

C2

uptimebot.kozow.com:1433

Mutex

e9dcc42b-891b-4ecf-8c28-a7f0902ea9f5

Attributes

encryption_key
BEAE5A044A95E05C2D32FE96BBDBA968D6356219
install_name
plesk.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Startup
subdirectory
Plesk

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/2380-5-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar

Downloads MZ/PE file 1 IoCs

flow	pid	Process
36	3616	Process not Found

Executes dropped EXE 2 IoCs

pid	Process
2740	plesk.exe
3356	plesk.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2704 set thread context of 2380	2704	user.exe	85
PID 2740 set thread context of 3356	2740	plesk.exe	92

Program crash 2 IoCs

pid	pid_target	Process	procid_target
4140	2704	WerFault.exe	84
4932	2740	WerFault.exe	91

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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	plesk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MicrosoftEdgeUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	user.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	user.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	plesk.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
1728	MicrosoftEdgeUpdate.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
4684	schtasks.exe
1304	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2380	user.exe
Token: SeDebugPrivilege	3356	plesk.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3356	plesk.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 2704 wrote to memory of 2380	2704	user.exe	85
PID 2704 wrote to memory of 2380	2704	user.exe	85
PID 2704 wrote to memory of 2380	2704	user.exe	85
PID 2704 wrote to memory of 2380	2704	user.exe	85
PID 2704 wrote to memory of 2380	2704	user.exe	85
PID 2704 wrote to memory of 2380	2704	user.exe	85
PID 2704 wrote to memory of 2380	2704	user.exe	85
PID 2704 wrote to memory of 2380	2704	user.exe	85
PID 2380 wrote to memory of 4684	2380	user.exe	89
PID 2380 wrote to memory of 4684	2380	user.exe	89
PID 2380 wrote to memory of 4684	2380	user.exe	89
PID 2380 wrote to memory of 2740	2380	user.exe	91
PID 2380 wrote to memory of 2740	2380	user.exe	91
PID 2380 wrote to memory of 2740	2380	user.exe	91
PID 2740 wrote to memory of 3356	2740	plesk.exe	92
PID 2740 wrote to memory of 3356	2740	plesk.exe	92
PID 2740 wrote to memory of 3356	2740	plesk.exe	92
PID 2740 wrote to memory of 3356	2740	plesk.exe	92
PID 2740 wrote to memory of 3356	2740	plesk.exe	92
PID 2740 wrote to memory of 3356	2740	plesk.exe	92
PID 2740 wrote to memory of 3356	2740	plesk.exe	92
PID 2740 wrote to memory of 3356	2740	plesk.exe	92
PID 3356 wrote to memory of 1304	3356	plesk.exe	95
PID 3356 wrote to memory of 1304	3356	plesk.exe	95
PID 3356 wrote to memory of 1304	3356	plesk.exe	95

C:\Users\Admin\AppData\Local\Temp\user.exe
"C:\Users\Admin\AppData\Local\Temp\user.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2704
- C:\Users\Admin\AppData\Local\Temp\user.exe
  "C:\Users\Admin\AppData\Local\Temp\user.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2380
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Plesk\plesk.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4684
- - C:\Users\Admin\AppData\Roaming\Plesk\plesk.exe
    "C:\Users\Admin\AppData\Roaming\Plesk\plesk.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2740
  - - C:\Users\Admin\AppData\Roaming\Plesk\plesk.exe
      "C:\Users\Admin\AppData\Roaming\Plesk\plesk.exe"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:3356
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Plesk\plesk.exe" /rl HIGHEST /f
        5⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:1304
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2740 -s 832
      4⤵
      Program crash
      PID:4932
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2704 -s 816
  2⤵
  - Program crash
  PID:4140

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2704 -ip 2704
1⤵
PID:4248

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 2740 -ip 2740
1⤵
PID:1104

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSIxIiBpbnN0YWxsZGF0ZXRpbWU9IjE3Mzg5NDU1NzgiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4MzQxODAxNjUyMzAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1MjcwOTQxODE5Ii8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:1728

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Plesk\plesk.exe

Filesize
3.2MB

MD5
6c6b777d8e1ca16b3f2be293d1b417d4

SHA1
5a2e987253aa8c4606e5e8829c4ab823891226c2

SHA256
48f11a020991c4c5990a1431ef576a7c5e3f502da65fd12a834ad0108310fa79

SHA512
fc3698b5eeeb530a45cd58ecec8240a7411070dcb92dff0657e3e67e74b8a42069bd6c96532f2b1a3a33ac0118e17cdf40233abccea303da8ff1747e20b87913

Download Submit
memory/2380-9-0x0000000073960000-0x0000000074110000-memory.dmp

Filesize
7.7MB

Download
memory/2380-8-0x0000000005C20000-0x0000000005CB2000-memory.dmp

Filesize
584KB

Download
memory/2380-10-0x0000000005BD0000-0x0000000005BDA000-memory.dmp

Filesize
40KB

Download
memory/2380-5-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2380-18-0x0000000073960000-0x0000000074110000-memory.dmp

Filesize
7.7MB

Download
memory/2380-7-0x0000000073960000-0x0000000074110000-memory.dmp

Filesize
7.7MB

Download
memory/2704-6-0x0000000073960000-0x0000000074110000-memory.dmp

Filesize
7.7MB

Download
memory/2704-1-0x0000000000930000-0x0000000000C66000-memory.dmp

Filesize
3.2MB

Download
memory/2704-3-0x0000000005BF0000-0x0000000006194000-memory.dmp

Filesize
5.6MB

Download
memory/2704-2-0x0000000073960000-0x0000000074110000-memory.dmp

Filesize
7.7MB

Download
memory/2704-0-0x000000007396E000-0x000000007396F000-memory.dmp

Filesize
4KB

Download
memory/2704-11-0x0000000073960000-0x0000000074110000-memory.dmp

Filesize
7.7MB

Download
memory/2740-19-0x0000000073960000-0x0000000074110000-memory.dmp

Filesize
7.7MB

Download
memory/2740-23-0x0000000073960000-0x0000000074110000-memory.dmp

Filesize
7.7MB

Download
memory/3356-24-0x0000000006AF0000-0x0000000007108000-memory.dmp

Filesize
6.1MB

Download
memory/3356-25-0x0000000006650000-0x00000000066A0000-memory.dmp

Filesize
320KB

Download
memory/3356-26-0x00000000068C0000-0x0000000006972000-memory.dmp

Filesize
712KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads