quasar | c18119713c678bbea78db54da4099ec7c5ff05e06b9c2904f08e9a2bca0219aa

Analysis

max time kernel
184s
max time network
191s
platform
windows7_x64
resource
win7-20240611-en
resource tags

arch:x64arch:x86image:win7-20240611-enlocale:en-usos:windows7-x64system
submitted
29-06-2024 22:58

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General

Target

gold.exe
Size

342KB
MD5

b769a45330b8bb61879f95faab68a297
SHA1

085bab79dba61f06651d9904a0966059678f7abb
SHA256

c18119713c678bbea78db54da4099ec7c5ff05e06b9c2904f08e9a2bca0219aa
SHA512

2841523621dfc463d6256fc6b91daec3861d61e8122b8b912c0da4642d721ad34aca6a8dce8deabcf46d3bfc7f31ceca7bef743ecfe4ea1b0378c28f6b8ca30d
SSDEEP

6144:fsBkCMuffjLfszRU97qtC9iSxHdP5wpSga10RMm5agGUn4lshyfS0W6yVqtAknTv:fsBkhuHjLEz6JifSJdP5wp/a1KvGkNhY

Score

10^/10

quasar persistence spyware trojan

Malware Config

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2716 Client.exe

pid	process
2716	Client.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

gold.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-39690363-730359138-1046745555-1000\Software\Microsoft\Windows\CurrentVersion\Run\Steam = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\gold.exe\""	gold.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

flow	ioc
2	ip-api.com

Drops file in Program Files directory 4 IoCs

Processes:

gold.exeClient.exe

description	ioc	process
File created	C:\Program Files (x86)\SubDir\Client.exe	gold.exe
File opened for modification	C:\Program Files (x86)\SubDir\Client.exe	gold.exe
File opened for modification	C:\Program Files (x86)\SubDir\Client.exe	Client.exe
File opened for modification	C:\Program Files (x86)\SubDir	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

2956 schtasks.exe
2780 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

gold.exeClient.exe

description pid process

Token: SeDebugPrivilege 2924 gold.exe
Token: SeDebugPrivilege 2716 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2716 Client.exe

pid	process
2956	schtasks.exe
2780	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2924	gold.exe
Token: SeDebugPrivilege	2716	Client.exe

pid	process
2716	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

gold.exeClient.exe

description	pid	process	target process
PID 2924 wrote to memory of 2956	2924	gold.exe	schtasks.exe
PID 2924 wrote to memory of 2956	2924	gold.exe	schtasks.exe
PID 2924 wrote to memory of 2956	2924	gold.exe	schtasks.exe
PID 2924 wrote to memory of 2716	2924	gold.exe	Client.exe
PID 2924 wrote to memory of 2716	2924	gold.exe	Client.exe
PID 2924 wrote to memory of 2716	2924	gold.exe	Client.exe
PID 2716 wrote to memory of 2780	2716	Client.exe	schtasks.exe
PID 2716 wrote to memory of 2780	2716	Client.exe	schtasks.exe
PID 2716 wrote to memory of 2780	2716	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\gold.exe
"C:\Users\Admin\AppData\Local\Temp\gold.exe"
1⤵
- Adds Run key to start application
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2924

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Steam" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\gold.exe" /rl HIGHEST /f
2⤵
- Scheduled Task/Job: Scheduled Task
PID:2956

C:\Program Files (x86)\SubDir\Client.exe
"C:\Program Files (x86)\SubDir\Client.exe"
2⤵
- Executes dropped EXE
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2716

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Steam" /sc ONLOGON /tr "C:\Program Files (x86)\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Scheduled Task/Job: Scheduled Task
PID:2780

Network

MITRE ATT&CK Matrix ATT&CK v13

Replay Monitor

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Downloads

C:\Program Files (x86)\SubDir\Client.exe
Filesize
342KB

MD5
b769a45330b8bb61879f95faab68a297

SHA1
085bab79dba61f06651d9904a0966059678f7abb

SHA256
c18119713c678bbea78db54da4099ec7c5ff05e06b9c2904f08e9a2bca0219aa

SHA512
2841523621dfc463d6256fc6b91daec3861d61e8122b8b912c0da4642d721ad34aca6a8dce8deabcf46d3bfc7f31ceca7bef743ecfe4ea1b0378c28f6b8ca30d

Download Submit
memory/2716-9-0x00000000013E0000-0x00000000013E8000-memory.dmp

Filesize
32KB

Download
memory/2716-10-0x000007FEF56E0000-0x000007FEF60CC000-memory.dmp

Filesize
9.9MB

Download
memory/2716-11-0x000007FEF56E0000-0x000007FEF60CC000-memory.dmp

Filesize
9.9MB

Download
memory/2716-14-0x000007FEF56E0000-0x000007FEF60CC000-memory.dmp

Filesize
9.9MB

Download
memory/2716-15-0x000007FEF56E0000-0x000007FEF60CC000-memory.dmp

Filesize
9.9MB

Download
memory/2924-0-0x000007FEF56E3000-0x000007FEF56E4000-memory.dmp

Filesize
4KB

Download
memory/2924-1-0x0000000001160000-0x0000000001168000-memory.dmp

Filesize
32KB

Download
memory/2924-2-0x0000000000BA0000-0x0000000000C3E000-memory.dmp

Filesize
632KB

Download
memory/2924-3-0x000007FEF56E0000-0x000007FEF60CC000-memory.dmp

Filesize
9.9MB

Download
memory/2924-12-0x000007FEF56E0000-0x000007FEF60CC000-memory.dmp

Filesize
9.9MB

Download