quasar | add949efc7c222e2a5c8189a56464384bd116eb05994f85891f1b57ecd570754

General

Target

Client-built.exe
Size

3.1MB
MD5

d5e34b544737c509d2c715befcf13bbe
SHA1

d32b3541f63a135cfb4cedda600641d34c4cb1ce
SHA256

add949efc7c222e2a5c8189a56464384bd116eb05994f85891f1b57ecd570754
SHA512

5f645abc822994f1615b7aa7c7e4a2dd3dc8c7d977792c82bf891629af65b81836d2c80268edcd2f80f798806744bfa09f6b2a08950d7c4e892e8ddc3a80e4e8
SSDEEP

49152:rvHI22SsaNYfdPBldt698dBcjHnBhETidKoGdVvTHHB72eh2NT:rvo22SsaNYfdPBldt6+dBcjHnB6Tis

Score

10^/10

quasar runtime broker spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Runtime Broker

C2

192.168.100.7:4449

Mutex

25995a9e-6e08-4214-8fe6-1aa44dc5c1d2

Attributes

encryption_key
B34E98F6CCC5FEAE5629334642BF27F516AF7D4F
install_name
Runtime Broker.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Runtime Broker
subdirectory
SubDir

Signatures

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

Quasar payload 4 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2316-1-0x0000000000FD0000-0x00000000012F4000-memory.dmp	family_quasar
C:\Windows\System32\SubDir\Runtime Broker.exe	family_quasar
behavioral1/memory/1048-10-0x0000000000A40000-0x0000000000D64000-memory.dmp	family_quasar
behavioral1/memory/3008-12-0x0000000140000000-0x00000001405E8000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Runtime Broker.exe

pid process

1048 Runtime Broker.exe

pid	process
1048	Runtime Broker.exe

Drops file in System32 directory 5 IoCs

Processes:

Client-built.exeRuntime Broker.exe

description	ioc	process
File created	C:\Windows\system32\SubDir\Runtime Broker.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Runtime Broker.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Runtime Broker.exe	Runtime Broker.exe
File opened for modification	C:\Windows\system32\SubDir	Runtime Broker.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

2948 schtasks.exe
2600 schtasks.exe

pid	process
2948	schtasks.exe
2600	schtasks.exe

Modifies registry class 27 IoCs

Processes:

taskmgr.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_Classes\Local Settings	taskmgr.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\MRUListEx = 00000000ffffffff	taskmgr.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\0	taskmgr.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\0\0\0\MRUListEx = ffffffff	taskmgr.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU	taskmgr.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\0\0	taskmgr.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\0\0\0 = 5000310000000000bc583db9120053756244697200003a0008000400efbebc583db9bc583db92a000000cd5c010000000b000000000000000000000000000000530075006200440069007200000016000000	taskmgr.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\Bags\1\Shell	taskmgr.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0	taskmgr.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\0\0\MRUListEx = 00000000ffffffff	taskmgr.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\0\0\0\NodeSlot = "1"	taskmgr.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = 00000000ffffffff	taskmgr.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0 = 19002f433a5c000000000000000000000000000000000000000000	taskmgr.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\0\0 = 5600310000000000bc583db9100053797374656d333200003e0008000400efbeee3a861abc583db92a00000027090000000001000000000000000000000000000000530079007300740065006d0033003200000018000000	taskmgr.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\Bags	taskmgr.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\Bags\1	taskmgr.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\Bags\1\Shell\KnownFolderDerivedFolderType = "{57807898-8C4F-4462-BB63-71042380B109}"	taskmgr.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell	taskmgr.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots	taskmgr.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff	taskmgr.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0 = 14001f50e04fd020ea3a6910a2d808002b30309d0000	taskmgr.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\0\MRUListEx = 00000000ffffffff	taskmgr.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots = 02	taskmgr.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\MRUListEx = 00000000ffffffff	taskmgr.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0	taskmgr.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\0 = 52003100000000005558d675100057696e646f7773003c0008000400efbeee3a851a5558d6752a0000008a020000000001000000000000000000000000000000570069006e0064006f0077007300000016000000	taskmgr.exe
Key created	\REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\0\0\0\0\0	taskmgr.exe

Suspicious behavior: EnumeratesProcesses 29 IoCs

Processes:

taskmgr.exe

pid	process
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

Client-built.exeRuntime Broker.exetaskmgr.exe

description pid process

Token: SeDebugPrivilege 2316 Client-built.exe
Token: SeDebugPrivilege 1048 Runtime Broker.exe
Token: SeDebugPrivilege 3008 taskmgr.exe

description	pid	process
Token: SeDebugPrivilege	2316	Client-built.exe
Token: SeDebugPrivilege	1048	Runtime Broker.exe
Token: SeDebugPrivilege	3008	taskmgr.exe

Suspicious use of FindShellTrayWindow 54 IoCs

Processes:

taskmgr.exe

pid	process
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe

Suspicious use of SendNotifyMessage 54 IoCs

Processes:

taskmgr.exe

pid	process
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe
3008	taskmgr.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Runtime Broker.exe

pid process

1048 Runtime Broker.exe

pid	process
1048	Runtime Broker.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exeRuntime Broker.exe

description	pid	process	target process
PID 2316 wrote to memory of 2948	2316	Client-built.exe	schtasks.exe
PID 2316 wrote to memory of 2948	2316	Client-built.exe	schtasks.exe
PID 2316 wrote to memory of 2948	2316	Client-built.exe	schtasks.exe
PID 2316 wrote to memory of 1048	2316	Client-built.exe	Runtime Broker.exe
PID 2316 wrote to memory of 1048	2316	Client-built.exe	Runtime Broker.exe
PID 2316 wrote to memory of 1048	2316	Client-built.exe	Runtime Broker.exe
PID 1048 wrote to memory of 2600	1048	Runtime Broker.exe	schtasks.exe
PID 1048 wrote to memory of 2600	1048	Runtime Broker.exe	schtasks.exe
PID 1048 wrote to memory of 2600	1048	Runtime Broker.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⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2316

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Runtime Broker" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Runtime Broker.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:2948

C:\Windows\system32\SubDir\Runtime Broker.exe
"C:\Windows\system32\SubDir\Runtime Broker.exe"
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1048

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Runtime Broker" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Runtime Broker.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:2600

C:\Windows\system32\taskmgr.exe
"C:\Windows\system32\taskmgr.exe" /4
1⤵
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:3008

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

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Downloads

C:\Windows\System32\SubDir\Runtime Broker.exe

Filesize
3.1MB

MD5
d5e34b544737c509d2c715befcf13bbe

SHA1
d32b3541f63a135cfb4cedda600641d34c4cb1ce

SHA256
add949efc7c222e2a5c8189a56464384bd116eb05994f85891f1b57ecd570754

SHA512
5f645abc822994f1615b7aa7c7e4a2dd3dc8c7d977792c82bf891629af65b81836d2c80268edcd2f80f798806744bfa09f6b2a08950d7c4e892e8ddc3a80e4e8

Download Submit
memory/1048-10-0x0000000000A40000-0x0000000000D64000-memory.dmp

Filesize
3.1MB

Download
memory/1048-8-0x000007FEF5220000-0x000007FEF5C0C000-memory.dmp

Filesize
9.9MB

Download
memory/1048-11-0x000007FEF5220000-0x000007FEF5C0C000-memory.dmp

Filesize
9.9MB

Download
memory/1048-15-0x000007FEF5220000-0x000007FEF5C0C000-memory.dmp

Filesize
9.9MB

Download
memory/1048-16-0x000007FEF5220000-0x000007FEF5C0C000-memory.dmp

Filesize
9.9MB

Download
memory/2316-2-0x000007FEF5220000-0x000007FEF5C0C000-memory.dmp

Filesize
9.9MB

Download
memory/2316-1-0x0000000000FD0000-0x00000000012F4000-memory.dmp

Filesize
3.1MB

Download
memory/2316-9-0x000007FEF5220000-0x000007FEF5C0C000-memory.dmp

Filesize
9.9MB

Download
memory/2316-0-0x000007FEF5223000-0x000007FEF5224000-memory.dmp

Filesize
4KB

Download
memory/3008-12-0x0000000140000000-0x00000001405E8000-memory.dmp

Filesize
5.9MB

Download
memory/3008-13-0x0000000140000000-0x00000001405E8000-memory.dmp

Filesize
5.9MB

Download
memory/3008-14-0x0000000002430000-0x0000000002440000-memory.dmp

Filesize
64KB

Download
memory/3008-17-0x0000000140000000-0x00000001405E8000-memory.dmp

Filesize
5.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads