quasar | 36be936ba0fc160a314bfaf9be4c8689730ad9c11c3cf6fb7d066c43a934b257

General

Target

RunMe.exe
Size

3.1MB
MD5

392a6ea0718747e4ad443f730047715b
SHA1

808d682efeb32bd7f98e49b7b99350683162059e
SHA256

36be936ba0fc160a314bfaf9be4c8689730ad9c11c3cf6fb7d066c43a934b257
SHA512

b033da7b04a2dc9a342de4970ae1fe26cda4d82bd3fe4a2a2f34507675832912cc6d66456a8a846f75a705523514d4b52bbd120e7b629c3d38467d999d2e95b4
SSDEEP

49152:Dv4z92YpaQI6oPZlhP3Reybewo5GRJ63bR3LoGdvZTHHB72eh2NT:Dvi92YpaQI6oPZlhP3Yybewo5GRJ6Jf

Score

10^/10

quasar emmassub spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

EmmasSub

C2

85.23.24.170:4782

85.23.109.34:4782

82.128.254.93:4782

Mutex

f82c7021-f558-4f6f-bbb3-fbe420c708e5

Attributes

encryption_key
4DC093FC202D016F95DCEE92AAF2874F56ACC3F2
install_name
RuntimeBroker.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Update
subdirectory
WindowsSecureManager

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/3748-1-0x0000000000EF0000-0x0000000001214000-memory.dmp	family_quasar
C:\Windows\System32\WindowsSecureManager\RuntimeBroker.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

RuntimeBroker.exe

pid process

2448 RuntimeBroker.exe

pid	process
2448	RuntimeBroker.exe

Drops file in System32 directory 5 IoCs

Processes:

RunMe.exeRuntimeBroker.exe

description	ioc	process
File opened for modification	C:\Windows\system32\WindowsSecureManager	RunMe.exe
File opened for modification	C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe	RuntimeBroker.exe
File opened for modification	C:\Windows\system32\WindowsSecureManager	RuntimeBroker.exe
File created	C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe	RunMe.exe
File opened for modification	C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe	RunMe.exe

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/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

1560 schtasks.exe
4496 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

RunMe.exeRuntimeBroker.exe

description pid process

Token: SeDebugPrivilege 3748 RunMe.exe
Token: SeDebugPrivilege 2448 RuntimeBroker.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

RuntimeBroker.exe

pid process

2448 RuntimeBroker.exe

pid	process
1560	schtasks.exe
4496	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	3748	RunMe.exe
Token: SeDebugPrivilege	2448	RuntimeBroker.exe

pid	process
2448	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

RunMe.exeRuntimeBroker.exe

description	pid	process	target process
PID 3748 wrote to memory of 1560	3748	RunMe.exe	schtasks.exe
PID 3748 wrote to memory of 1560	3748	RunMe.exe	schtasks.exe
PID 3748 wrote to memory of 2448	3748	RunMe.exe	RuntimeBroker.exe
PID 3748 wrote to memory of 2448	3748	RunMe.exe	RuntimeBroker.exe
PID 2448 wrote to memory of 4496	2448	RuntimeBroker.exe	schtasks.exe
PID 2448 wrote to memory of 4496	2448	RuntimeBroker.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\RunMe.exe
"C:\Users\Admin\AppData\Local\Temp\RunMe.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3748

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1560

C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe
"C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe"
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2448

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:4496

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Windows\System32\WindowsSecureManager\RuntimeBroker.exe
Filesize
3.1MB

MD5
392a6ea0718747e4ad443f730047715b

SHA1
808d682efeb32bd7f98e49b7b99350683162059e

SHA256
36be936ba0fc160a314bfaf9be4c8689730ad9c11c3cf6fb7d066c43a934b257

SHA512
b033da7b04a2dc9a342de4970ae1fe26cda4d82bd3fe4a2a2f34507675832912cc6d66456a8a846f75a705523514d4b52bbd120e7b629c3d38467d999d2e95b4

Download Submit
memory/2448-9-0x00007FFC80FE0000-0x00007FFC81AA2000-memory.dmp

Filesize
10.8MB

Download
memory/2448-11-0x000000001D190000-0x000000001D1E0000-memory.dmp

Filesize
320KB

Download
memory/2448-12-0x000000001D8C0000-0x000000001D972000-memory.dmp

Filesize
712KB

Download
memory/3748-0-0x00007FFC80FE3000-0x00007FFC80FE5000-memory.dmp

Filesize
8KB

Download
memory/3748-1-0x0000000000EF0000-0x0000000001214000-memory.dmp

Filesize
3.1MB

Download
memory/3748-2-0x00007FFC80FE0000-0x00007FFC81AA2000-memory.dmp

Filesize
10.8MB

Download
memory/3748-10-0x00007FFC80FE0000-0x00007FFC81AA2000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads