quasar | ecb6ddd0b697ef6d270088b45d347254cc79cda47ad7bde0b02ac50f4b668ea0

General

Target

ren_installer.exe.vbs
Size

4.4MB
MD5

536ac26b63fe850c37ba9bed94792656
SHA1

2ed38ec15f4d9c2f3f62b9e76f7e867708be52a2
SHA256

ecb6ddd0b697ef6d270088b45d347254cc79cda47ad7bde0b02ac50f4b668ea0
SHA512

95eda90758885dddc514cf7a71bb186fa566827d1dceeee1dafb554dc6081fb3f794b276612154679df3c86c1537114b9003543420bdab761d2eeb04e1b47900
SSDEEP

24576:NLSIeHVl7qq8Kpz3e4WlOnNHYadMpdJp2n1WT1L4whffYob7zdqx0nllmZw3/PLe:RYp7SThIEHcsleGEZZAn7i4Ch

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 7 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\ren_installer.exe	family_quasar
C:\Users\Admin\AppData\Local\Temp\ren_installer.exe	family_quasar
behavioral1/memory/1148-59-0x00000000002D0000-0x00000000005F4000-memory.dmp	family_quasar
C:\Windows\System32\servicerenk\renservice.exe	family_quasar
C:\Windows\System32\servicerenk\renservice.exe	family_quasar
C:\Windows\system32\servicerenk\renservice.exe	family_quasar
behavioral1/memory/392-66-0x0000000000010000-0x0000000000334000-memory.dmp	family_quasar

Executes dropped EXE 2 IoCs

Processes:

ren_installer.exerenservice.exe

pid process

1148 ren_installer.exe
392 renservice.exe

pid	process
1148	ren_installer.exe
392	renservice.exe

Drops file in System32 directory 5 IoCs

Processes:

renservice.exeren_installer.exe

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

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

268 schtasks.exe
616 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

ren_installer.exerenservice.exe

description pid process

Token: SeDebugPrivilege 1148 ren_installer.exe
Token: SeDebugPrivilege 392 renservice.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

renservice.exe

pid process

392 renservice.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

renservice.exe

pid process

392 renservice.exe

pid	process
268	schtasks.exe
616	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1148	ren_installer.exe
Token: SeDebugPrivilege	392	renservice.exe

pid	process
392	renservice.exe

pid	process
392	renservice.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

WScript.exeren_installer.exerenservice.exe

description	pid	process	target process
PID 1768 wrote to memory of 1148	1768	WScript.exe	ren_installer.exe
PID 1768 wrote to memory of 1148	1768	WScript.exe	ren_installer.exe
PID 1768 wrote to memory of 1148	1768	WScript.exe	ren_installer.exe
PID 1148 wrote to memory of 268	1148	ren_installer.exe	schtasks.exe
PID 1148 wrote to memory of 268	1148	ren_installer.exe	schtasks.exe
PID 1148 wrote to memory of 268	1148	ren_installer.exe	schtasks.exe
PID 1148 wrote to memory of 392	1148	ren_installer.exe	renservice.exe
PID 1148 wrote to memory of 392	1148	ren_installer.exe	renservice.exe
PID 1148 wrote to memory of 392	1148	ren_installer.exe	renservice.exe
PID 392 wrote to memory of 616	392	renservice.exe	schtasks.exe
PID 392 wrote to memory of 616	392	renservice.exe	schtasks.exe
PID 392 wrote to memory of 616	392	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:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\ren_installer.exe.vbs"
1⤵
- Suspicious use of WriteProcessMemory
PID:1768

C:\Users\Admin\AppData\Local\Temp\ren_installer.exe
"C:\Users\Admin\AppData\Local\Temp\ren_installer.exe"
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1148

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:268

C:\Windows\system32\servicerenk\renservice.exe
"C:\Windows\system32\servicerenk\renservice.exe"
3⤵
- 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:392

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "renservice" /sc ONLOGON /tr "C:\Windows\system32\servicerenk\renservice.exe" /rl HIGHEST /f
4⤵
- Creates scheduled task(s)
PID:616

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:\Users\Admin\AppData\Local\Temp\ren_installer.exe
Filesize
3.1MB

MD5
10c9f8a8e8c8c9797643d9b1edb01cc1

SHA1
defcd4e8bba01bb730572dff40fad78e053f337a

SHA256
0809e0c6095acabdcb816728c39fc818741c3197c4635d7a53a926f2f8df7557

SHA512
a3c1e18ed24bcc03385a6cb7e50bae9c475c93f0a9af88ac731e9c1923b314ea60e79bd4b9b420b31050ea2d67ac6746cb7d3b2edba7056e91fd665f12311849

Download Submit
C:\Users\Admin\AppData\Local\Temp\ren_installer.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
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/392-66-0x0000000000010000-0x0000000000334000-memory.dmp

Filesize
3.1MB

Download
memory/392-67-0x000000001B190000-0x000000001B210000-memory.dmp

Filesize
512KB

Download
memory/1148-59-0x00000000002D0000-0x00000000005F4000-memory.dmp

Filesize
3.1MB

Download
memory/1148-60-0x000000001AF20000-0x000000001AFA0000-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