quasar | 0809e0c6095acabdcb816728c39fc818741c3197c4635d7a53a926f2f8df7557

General

Target

ren_installer.exe
Size

3.1MB
MD5

10c9f8a8e8c8c9797643d9b1edb01cc1
SHA1

defcd4e8bba01bb730572dff40fad78e053f337a
SHA256

0809e0c6095acabdcb816728c39fc818741c3197c4635d7a53a926f2f8df7557
SHA512

a3c1e18ed24bcc03385a6cb7e50bae9c475c93f0a9af88ac731e9c1923b314ea60e79bd4b9b420b31050ea2d67ac6746cb7d3b2edba7056e91fd665f12311849
SSDEEP

49152:+vgt62XlaSFNWPjljiFa2RoUYI3vLroGd4THHB72eh2NT:+vM62XlaSFNWPjljiFXRoUYI3vf

Score

10^/10

quasar reservices spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

ReServices

C2

185.65.134.175:55498

Mutex

86e242cc-399d-4e30-a743-e89f0418f106

Attributes

encryption_key
B451C26057A2AEFC83990793720D2316EA48C49A
install_name
renservice.exe
log_directory
Logs
reconnect_delay
3000
startup_key
renservice
subdirectory
servicerenk

Signatures

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

Quasar payload 4 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2024-54-0x00000000011B0000-0x00000000014D4000-memory.dmp	family_quasar
C:\Windows\System32\servicerenk\renservice.exe	family_quasar
C:\Windows\system32\servicerenk\renservice.exe	family_quasar
behavioral1/memory/1060-61-0x00000000008C0000-0x0000000000BE4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

renservice.exe

pid process

1060 renservice.exe

pid	process
1060	renservice.exe

Drops file in System32 directory 5 IoCs

Processes:

ren_installer.exerenservice.exe

description	ioc	process
File created	C:\Windows\system32\servicerenk\renservice.exe	ren_installer.exe
File opened for modification	C:\Windows\system32\servicerenk\renservice.exe	ren_installer.exe
File opened for modification	C:\Windows\system32\servicerenk	ren_installer.exe
File opened for modification	C:\Windows\system32\servicerenk\renservice.exe	renservice.exe
File opened for modification	C:\Windows\system32\servicerenk	renservice.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exeschtasks.exe

pid process

1036 schtasks.exe
1480 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

ren_installer.exerenservice.exe

description pid process

Token: SeDebugPrivilege 2024 ren_installer.exe
Token: SeDebugPrivilege 1060 renservice.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

renservice.exe

pid process

1060 renservice.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

renservice.exe

pid process

1060 renservice.exe

pid	process
1036	schtasks.exe
1480	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2024	ren_installer.exe
Token: SeDebugPrivilege	1060	renservice.exe

pid	process
1060	renservice.exe

pid	process
1060	renservice.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

ren_installer.exerenservice.exe

description	pid	process	target process
PID 2024 wrote to memory of 1036	2024	ren_installer.exe	schtasks.exe
PID 2024 wrote to memory of 1036	2024	ren_installer.exe	schtasks.exe
PID 2024 wrote to memory of 1036	2024	ren_installer.exe	schtasks.exe
PID 2024 wrote to memory of 1060	2024	ren_installer.exe	renservice.exe
PID 2024 wrote to memory of 1060	2024	ren_installer.exe	renservice.exe
PID 2024 wrote to memory of 1060	2024	ren_installer.exe	renservice.exe
PID 1060 wrote to memory of 1480	1060	renservice.exe	schtasks.exe
PID 1060 wrote to memory of 1480	1060	renservice.exe	schtasks.exe
PID 1060 wrote to memory of 1480	1060	renservice.exe	schtasks.exe

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\ren_installer.exe
"C:\Users\Admin\AppData\Local\Temp\ren_installer.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2024

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "renservice" /sc ONLOGON /tr "C:\Windows\system32\servicerenk\renservice.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1036

C:\Windows\system32\servicerenk\renservice.exe
"C:\Windows\system32\servicerenk\renservice.exe"
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1060

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "renservice" /sc ONLOGON /tr "C:\Windows\system32\servicerenk\renservice.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:1480

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Query Registry

1

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Windows\System32\servicerenk\renservice.exe
Filesize
3.1MB

MD5
10c9f8a8e8c8c9797643d9b1edb01cc1

SHA1
defcd4e8bba01bb730572dff40fad78e053f337a

SHA256
0809e0c6095acabdcb816728c39fc818741c3197c4635d7a53a926f2f8df7557

SHA512
a3c1e18ed24bcc03385a6cb7e50bae9c475c93f0a9af88ac731e9c1923b314ea60e79bd4b9b420b31050ea2d67ac6746cb7d3b2edba7056e91fd665f12311849

Download Submit
C:\Windows\system32\servicerenk\renservice.exe
Filesize
3.1MB

MD5
10c9f8a8e8c8c9797643d9b1edb01cc1

SHA1
defcd4e8bba01bb730572dff40fad78e053f337a

SHA256
0809e0c6095acabdcb816728c39fc818741c3197c4635d7a53a926f2f8df7557

SHA512
a3c1e18ed24bcc03385a6cb7e50bae9c475c93f0a9af88ac731e9c1923b314ea60e79bd4b9b420b31050ea2d67ac6746cb7d3b2edba7056e91fd665f12311849

Download Submit
memory/1060-61-0x00000000008C0000-0x0000000000BE4000-memory.dmp

Filesize
3.1MB

Download
memory/1060-62-0x000000001B380000-0x000000001B400000-memory.dmp

Filesize
512KB

Download
memory/2024-54-0x00000000011B0000-0x00000000014D4000-memory.dmp

Filesize
3.1MB

Download
memory/2024-55-0x000000001B370000-0x000000001B3F0000-memory.dmp

Filesize
512KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads