quasar | 3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a

General

Target

3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
Size

628KB
MD5

2ca449f58a5f5c95541640a52e611180
SHA1

3159a573bf68b83c2f19c9d0c738f8995a8d9147
SHA256

3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a
SHA512

9674de07081da790be80096e7075dc69defcd6fc3fbc8688eb745087111c84afc8917034d4d07c7aa86583833d4f43e98d5a127d08f2dbce273431308b65c091

Score

10^/10

quasar office04 evasion rezer0 spyware suricata trojan

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Office04

C2

118.208.43.110:9991

118.208.43.110:9992

118.208.43.110:9993

118.208.43.110:9994

118.208.43.110:9995

118.208.43.110:10000

118.208.43.110:9000

Mutex

QSR_MUTEX_wm8imRtp10eDcwBwM1

Attributes

encryption_key
CLr3aJXqYhM5uP8HVkUg
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

Modifies Windows Defender Real-time Protection settings 3 TTPs
evasion trojan

Modify Registry
T1112

Modify Existing Service
T1031

Disabling Security Tools
T1089

Quasar Payload 6 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1212-66-0x0000000000400000-0x0000000000482000-memory.dmp	family_quasar
behavioral1/memory/1212-68-0x0000000000400000-0x0000000000482000-memory.dmp	family_quasar
behavioral1/memory/1212-69-0x0000000000400000-0x0000000000482000-memory.dmp	family_quasar
behavioral1/memory/1212-70-0x00000000004582DE-mapping.dmp	family_quasar
behavioral1/memory/1212-72-0x0000000000400000-0x0000000000482000-memory.dmp	family_quasar
behavioral1/memory/1212-74-0x0000000000400000-0x0000000000482000-memory.dmp	family_quasar

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
suricata: ET MALWARE Common RAT Connectivity Check Observed
suricata: ET MALWARE Common RAT Connectivity Check Observed
suricata
Looks for VirtualBox Guest Additions in registry 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

ReZer0 packer 1 IoCs

Detects ReZer0, a packer with multiple versions used in various campaigns.

rezer0

Processes:

resource	yara_rule
behavioral1/memory/892-57-0x00000000051F0000-0x000000000527A000-memory.dmp	rezer0

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2040 Client.exe
Looks for VMWare Tools registry key 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

pid	process
2040	Client.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

Loads dropped DLL 1 IoCs

Processes:

3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

pid process

1212 3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

pid	process
1212	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.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

1 ip-api.com

flow	ioc
1	ip-api.com

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

description	pid	process	target process
PID 892 set thread context of 1212	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

1760 schtasks.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

powershell.exe3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

pid process

1788 powershell.exe
892 3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

pid	process
1760	schtasks.exe

pid	process
1788	powershell.exe
892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

powershell.exe3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

description	pid	process
Token: SeDebugPrivilege	1788	powershell.exe
Token: SeDebugPrivilege	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
Token: SeDebugPrivilege	1212	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe

description	pid	process	target process
PID 892 wrote to memory of 1788	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	powershell.exe
PID 892 wrote to memory of 1788	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	powershell.exe
PID 892 wrote to memory of 1788	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	powershell.exe
PID 892 wrote to memory of 1788	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	powershell.exe
PID 892 wrote to memory of 1760	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	schtasks.exe
PID 892 wrote to memory of 1760	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	schtasks.exe
PID 892 wrote to memory of 1760	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	schtasks.exe
PID 892 wrote to memory of 1760	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	schtasks.exe
PID 892 wrote to memory of 1212	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
PID 892 wrote to memory of 1212	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
PID 892 wrote to memory of 1212	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
PID 892 wrote to memory of 1212	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
PID 892 wrote to memory of 1212	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
PID 892 wrote to memory of 1212	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
PID 892 wrote to memory of 1212	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
PID 892 wrote to memory of 1212	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
PID 892 wrote to memory of 1212	892	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
PID 1212 wrote to memory of 2040	1212	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	Client.exe
PID 1212 wrote to memory of 2040	1212	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	Client.exe
PID 1212 wrote to memory of 2040	1212	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	Client.exe
PID 1212 wrote to memory of 2040	1212	3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe	Client.exe

C:\Users\Admin\AppData\Local\Temp\3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
"C:\Users\Admin\AppData\Local\Temp\3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe"
1⤵
- Checks BIOS information in registry
- Windows security modification
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:892

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"powershell" Get-MpPreference -verbose
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1788

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\XBTsEUzeb" /XML "C:\Users\Admin\AppData\Local\Temp\tmp31DB.tmp"
2⤵
- Creates scheduled task(s)
PID:1760

C:\Users\Admin\AppData\Local\Temp\3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a.exe
"{path}"
2⤵
- Loads dropped DLL
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1212

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
3⤵
- Executes dropped EXE
PID:2040

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Modify Existing Service

1

T1031

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

2

T1112

Disabling Security Tools

2

T1089

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Query Registry

4

T1012

Virtualization/Sandbox Evasion

2

T1497

System Information Discovery

3

T1082

Peripheral Device Discovery

1

T1120

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp31DB.tmp
Filesize
1KB

MD5
6fd68b64fb59384d47ad4abb256ee322

SHA1
d2b2ce161745a428d1f03faad17765ffcb2b1ac1

SHA256
e05e58c61e98fe8c19ee51378fc744a1e61ba4edead5aaa64de853bef52b2bba

SHA512
c28f4ba78fce7be18edb419fe92e96bbe102070fd3344a1a87b08e8ecb984862be31d9a9642bbdbb4e28cc78f72b16d95ca33705d6757bee48d955493725b59f

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
628KB

MD5
2ca449f58a5f5c95541640a52e611180

SHA1
3159a573bf68b83c2f19c9d0c738f8995a8d9147

SHA256
3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a

SHA512
9674de07081da790be80096e7075dc69defcd6fc3fbc8688eb745087111c84afc8917034d4d07c7aa86583833d4f43e98d5a127d08f2dbce273431308b65c091

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
628KB

MD5
2ca449f58a5f5c95541640a52e611180

SHA1
3159a573bf68b83c2f19c9d0c738f8995a8d9147

SHA256
3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a

SHA512
9674de07081da790be80096e7075dc69defcd6fc3fbc8688eb745087111c84afc8917034d4d07c7aa86583833d4f43e98d5a127d08f2dbce273431308b65c091

Download Submit
\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
628KB

MD5
2ca449f58a5f5c95541640a52e611180

SHA1
3159a573bf68b83c2f19c9d0c738f8995a8d9147

SHA256
3cae11d6380b043b5564154e5afcbe5df33a76d9b1abd77ffa453300d72f771a

SHA512
9674de07081da790be80096e7075dc69defcd6fc3fbc8688eb745087111c84afc8917034d4d07c7aa86583833d4f43e98d5a127d08f2dbce273431308b65c091

Download Submit
memory/892-54-0x00000000008A0000-0x0000000000944000-memory.dmp

Filesize
656KB

Download
memory/892-55-0x0000000075441000-0x0000000075443000-memory.dmp

Filesize
8KB

Download
memory/892-56-0x0000000000370000-0x000000000037E000-memory.dmp

Filesize
56KB

Download
memory/892-57-0x00000000051F0000-0x000000000527A000-memory.dmp

Filesize
552KB

Download
memory/1212-74-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1212-64-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1212-66-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1212-68-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1212-69-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1212-70-0x00000000004582DE-mapping.dmp

Download
memory/1212-72-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1212-63-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1760-61-0x0000000000000000-mapping.dmp

Download
memory/1788-60-0x000000006E8D0000-0x000000006EE7B000-memory.dmp

Filesize
5.7MB

Download
memory/1788-58-0x0000000000000000-mapping.dmp

Download
memory/2040-77-0x0000000000000000-mapping.dmp

Download
memory/2040-80-0x00000000003E0000-0x0000000000484000-memory.dmp

Filesize
656KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads