quasar | 4da81d41e48ee5ddf37d4c5dd49826ccf9a9f4ee9b2b89f64323de3a45cd1f84

Analysis

max time kernel
126s
max time network
136s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
30-06-2024 15:52

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General

Target

Client-built.exe
Size

3.1MB
MD5

40e23e474ee8d2726fe03b40081a25d6
SHA1

81c729c9dcaa6357d4c3d5e7f5c10f5b1f2a5844
SHA256

4da81d41e48ee5ddf37d4c5dd49826ccf9a9f4ee9b2b89f64323de3a45cd1f84
SHA512

bc536ccedb560c762df85b316650db397d4bb03f4c7e6d30530d9a685d34e936c26ae3981e9ea87dead6e735b992588c9fb374ea644c11baa0db1c12ef165251
SSDEEP

49152:3vTlL26AaNeWgPhlmVqvMQ7XSKhuRJ6+bR3LoGdi8THHB72eh2NT:3vJL26AaNeWgPhlmVqkQ7XSKhuRJ64S

Score

10^/10

quasar wave generator spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Wave Generator

192.168.1.150:4782

Mutex

4fa54cdc-4bee-4759-b0fd-21bb6d6f9eed

Attributes

encryption_key
99A3D9CE1DE6501187FC4C0E50EBB3FE8AD7B9A8
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Microsoft Task Manager Worker Service
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2352-1-0x0000000000F30000-0x0000000001254000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/1700-10-0x0000000000E90000-0x00000000011B4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

1700 Client.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

1856 schtasks.exe
2536 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description pid process

Token: SeDebugPrivilege 2352 Client-built.exe
Token: SeDebugPrivilege 1700 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

1700 Client.exe

pid	process
1700	Client.exe

pid	process
1856	schtasks.exe
2536	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2352	Client-built.exe
Token: SeDebugPrivilege	1700	Client.exe

pid	process
1700	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exeClient.exe

description	pid	process	target process
PID 2352 wrote to memory of 1856	2352	Client-built.exe	schtasks.exe
PID 2352 wrote to memory of 1856	2352	Client-built.exe	schtasks.exe
PID 2352 wrote to memory of 1856	2352	Client-built.exe	schtasks.exe
PID 2352 wrote to memory of 1700	2352	Client-built.exe	Client.exe
PID 2352 wrote to memory of 1700	2352	Client-built.exe	Client.exe
PID 2352 wrote to memory of 1700	2352	Client-built.exe	Client.exe
PID 1700 wrote to memory of 2536	1700	Client.exe	schtasks.exe
PID 1700 wrote to memory of 2536	1700	Client.exe	schtasks.exe
PID 1700 wrote to memory of 2536	1700	Client.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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2352

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Microsoft Task Manager Worker Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Scheduled Task/Job: Scheduled Task
PID:1856

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1700

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Microsoft Task Manager Worker Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Scheduled Task/Job: Scheduled Task
PID:2536

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
3.1MB

MD5
40e23e474ee8d2726fe03b40081a25d6

SHA1
81c729c9dcaa6357d4c3d5e7f5c10f5b1f2a5844

SHA256
4da81d41e48ee5ddf37d4c5dd49826ccf9a9f4ee9b2b89f64323de3a45cd1f84

SHA512
bc536ccedb560c762df85b316650db397d4bb03f4c7e6d30530d9a685d34e936c26ae3981e9ea87dead6e735b992588c9fb374ea644c11baa0db1c12ef165251

Download Submit
memory/1700-8-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

Filesize
9.9MB

Download
memory/1700-10-0x0000000000E90000-0x00000000011B4000-memory.dmp

Filesize
3.1MB

Download
memory/1700-11-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

Filesize
9.9MB

Download
memory/1700-12-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

Filesize
9.9MB

Download
memory/2352-0-0x000007FEF5F83000-0x000007FEF5F84000-memory.dmp

Filesize
4KB

Download
memory/2352-1-0x0000000000F30000-0x0000000001254000-memory.dmp

Filesize
3.1MB

Download
memory/2352-2-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

Filesize
9.9MB

Download
memory/2352-9-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

Filesize
9.9MB

Download