quasar | 968f80b313d7b5735455963fbc8423ab85c6ac4f20ee516257442e3a04b47a57

General

Target

2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe
Size

175KB
MD5

86f8ab131d760b36b3606c3297c907c3
SHA1

5ca6c76dc0c411384408ad093bcd321ed0c01603
SHA256

968f80b313d7b5735455963fbc8423ab85c6ac4f20ee516257442e3a04b47a57
SHA512

32df021c92ad01eed2a79e3310e9364c210eb701d040a3cf783102aa5f0b68989d75502b49a159a9f6a7bd859b1373a7db2f59ba8a281cbce028d9dca27fea7d
SSDEEP

3072:iHBOqsKPjqj7hGGM+lmsolAIrRuw+mqv9j1MWLQ:ihODGl+lDAA

Score

10^/10

quasar office04 execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

45.81.150.172:4782

Mutex

11baa5a5-5e9e-4125-84cc-37d234d4726b

Attributes

encryption_key
5F9E03EC6830CA20E37DC97AEE1BB847C8BF19CD
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\productlist.exe	family_quasar
behavioral2/memory/4816-31-0x00000000008C0000-0x0000000000BE4000-memory.dmp	family_quasar

Detects Windows executables referencing non-Windows User-Agents 2 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\productlist.exe	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral2/memory/4816-31-0x00000000008C0000-0x0000000000BE4000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 2 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\productlist.exe	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral2/memory/4816-31-0x00000000008C0000-0x0000000000BE4000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 2 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\productlist.exe	INDICATOR_SUSPICIOUS_GENInfoStealer
behavioral2/memory/4816-31-0x00000000008C0000-0x0000000000BE4000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer

Detects executables packed with 9Rays.Net Spices.Net Obfuscator. 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2896-3-0x0000000002200000-0x000000000220A000-memory.dmp	INDICATOR_EXE_Packed_Spices

Executes dropped EXE 4 IoCs

Processes:

productlist.exeproductlist.exeClient.exeClient.exe

pid process

4816 productlist.exe
4880 productlist.exe
808 Client.exe
4508 Client.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe

description pid process target process

PID 2896 set thread context of 1572 2896 2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe MSBuild.exe
Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Using powershell.exe command.
execution

PowerShell
T1059.001

Processes:

powershell.exe

pid process

3508 powershell.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 3 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exeschtasks.exe

pid process

4648 schtasks.exe
4848 schtasks.exe
3956 schtasks.exe

pid	process
4816	productlist.exe
4880	productlist.exe
808	Client.exe
4508	Client.exe

description	pid	process	target process
PID 2896 set thread context of 1572	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe

pid	process
3508	powershell.exe

pid	process
4648	schtasks.exe
4848	schtasks.exe
3956	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exepowershell.exe

pid	process
2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe
2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe
2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe
2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe
2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe
2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe
3508	powershell.exe
3508	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

Processes:

2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exeproductlist.exeproductlist.exepowershell.exeClient.exeClient.exe

description	pid	process
Token: SeDebugPrivilege	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe
Token: SeDebugPrivilege	4816	productlist.exe
Token: SeDebugPrivilege	4880	productlist.exe
Token: SeDebugPrivilege	3508	powershell.exe
Token: SeDebugPrivilege	4508	Client.exe
Token: SeDebugPrivilege	808	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

4508 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

4508 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

4508 Client.exe

pid	process
4508	Client.exe

pid	process
4508	Client.exe

pid	process
4508	Client.exe

Suspicious use of WriteProcessMemory 34 IoCs

Processes:

2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exeMSBuild.exeproductlist.exeproductlist.exeClient.exe

description	pid	process	target process
PID 2896 wrote to memory of 5044	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 5044	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 5044	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 3040	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 3040	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 3040	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 2332	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 2332	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 2332	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 1572	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 1572	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 1572	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 1572	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 1572	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 1572	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 1572	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 2896 wrote to memory of 1572	2896	2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe	MSBuild.exe
PID 1572 wrote to memory of 3508	1572	MSBuild.exe	powershell.exe
PID 1572 wrote to memory of 3508	1572	MSBuild.exe	powershell.exe
PID 1572 wrote to memory of 3508	1572	MSBuild.exe	powershell.exe
PID 1572 wrote to memory of 4816	1572	MSBuild.exe	productlist.exe
PID 1572 wrote to memory of 4816	1572	MSBuild.exe	productlist.exe
PID 1572 wrote to memory of 4880	1572	MSBuild.exe	productlist.exe
PID 1572 wrote to memory of 4880	1572	MSBuild.exe	productlist.exe
PID 4816 wrote to memory of 4648	4816	productlist.exe	schtasks.exe
PID 4816 wrote to memory of 4648	4816	productlist.exe	schtasks.exe
PID 4880 wrote to memory of 4848	4880	productlist.exe	schtasks.exe
PID 4880 wrote to memory of 4848	4880	productlist.exe	schtasks.exe
PID 4816 wrote to memory of 808	4816	productlist.exe	Client.exe
PID 4816 wrote to memory of 808	4816	productlist.exe	Client.exe
PID 4880 wrote to memory of 4508	4880	productlist.exe	Client.exe
PID 4880 wrote to memory of 4508	4880	productlist.exe	Client.exe
PID 4508 wrote to memory of 3956	4508	Client.exe	schtasks.exe
PID 4508 wrote to memory of 3956	4508	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\2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-23_86f8ab131d760b36b3606c3297c907c3_hiddentear.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2896

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
2⤵
PID:5044

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
2⤵
PID:3040

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
2⤵
PID:2332

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
2⤵
- Suspicious use of WriteProcessMemory
PID:1572

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAGcAZgB4ACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAHgAZABuACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAHgAdABiACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAGoAawBqACMAPgA="
3⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3508

C:\Users\Admin\AppData\Local\Temp\productlist.exe
"C:\Users\Admin\AppData\Local\Temp\productlist.exe"
3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4816

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
4⤵
- Creates scheduled task(s)
PID:4648

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
4⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:808

C:\Users\Admin\AppData\Local\Temp\productlist.exe
"C:\Users\Admin\AppData\Local\Temp\productlist.exe"
3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4880

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
4⤵
- Creates scheduled task(s)
PID:4848

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
4⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4508

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:3956

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

Scheduled Task/Job

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\productlist.exe.log

Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_pjgls0rn.zlj.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\productlist.exe

Filesize
3.1MB

MD5
5145c1da6a61679e1518fabf15bcd9b2

SHA1
9f804a68e5d2f62cafd782840165382118af4468

SHA256
6a12c7874c6c44b2b68fa013de4480f01f917e7d87605207fcccbc469f7df46a

SHA512
192f4f3ed78fd31e2a068ed648d53e031a0d667f5a43854225922896ff5bf02c3e0f614b70e975f893edb40d4d9ae109d2a354e6dd07f6a1e0e5b4ae21acc466

Download Submit
memory/1572-4-0x0000000000400000-0x0000000000742000-memory.dmp

Filesize
3.3MB

Download
memory/1572-7-0x0000000000400000-0x0000000000742000-memory.dmp

Filesize
3.3MB

Download
memory/2896-0-0x00007FFFD4533000-0x00007FFFD4535000-memory.dmp

Filesize
8KB

Download
memory/2896-2-0x00007FFFD4530000-0x00007FFFD4FF1000-memory.dmp

Filesize
10.8MB

Download
memory/2896-3-0x0000000002200000-0x000000000220A000-memory.dmp

Filesize
40KB

Download
memory/2896-8-0x00007FFFD4530000-0x00007FFFD4FF1000-memory.dmp

Filesize
10.8MB

Download
memory/2896-1-0x0000000000090000-0x00000000000C2000-memory.dmp

Filesize
200KB

Download
memory/3508-33-0x0000000004F00000-0x0000000004F22000-memory.dmp

Filesize
136KB

Download
memory/3508-73-0x0000000006E90000-0x0000000006F33000-memory.dmp

Filesize
652KB

Download
memory/3508-40-0x0000000005850000-0x00000000058B6000-memory.dmp

Filesize
408KB

Download
memory/3508-39-0x0000000005020000-0x0000000005086000-memory.dmp

Filesize
408KB

Download
memory/3508-30-0x00000000028F0000-0x0000000002926000-memory.dmp

Filesize
216KB

Download
memory/3508-46-0x00000000059C0000-0x0000000005D14000-memory.dmp

Filesize
3.3MB

Download
memory/3508-82-0x0000000007470000-0x0000000007478000-memory.dmp

Filesize
32KB

Download
memory/3508-18-0x0000000073DDE000-0x0000000073DDF000-memory.dmp

Filesize
4KB

Download
memory/3508-56-0x0000000005EB0000-0x0000000005ECE000-memory.dmp

Filesize
120KB

Download
memory/3508-57-0x0000000005EF0000-0x0000000005F3C000-memory.dmp

Filesize
304KB

Download
memory/3508-81-0x0000000007520000-0x000000000753A000-memory.dmp

Filesize
104KB

Download
memory/3508-80-0x0000000007440000-0x0000000007454000-memory.dmp

Filesize
80KB

Download
memory/3508-62-0x0000000074800000-0x000000007484C000-memory.dmp

Filesize
304KB

Download
memory/3508-32-0x0000000005120000-0x0000000005748000-memory.dmp

Filesize
6.2MB

Download
memory/3508-72-0x0000000006470000-0x000000000648E000-memory.dmp

Filesize
120KB

Download
memory/3508-61-0x0000000006E50000-0x0000000006E82000-memory.dmp

Filesize
200KB

Download
memory/3508-74-0x0000000007830000-0x0000000007EAA000-memory.dmp

Filesize
6.5MB

Download
memory/3508-75-0x00000000071F0000-0x000000000720A000-memory.dmp

Filesize
104KB

Download
memory/3508-76-0x0000000007260000-0x000000000726A000-memory.dmp

Filesize
40KB

Download
memory/3508-77-0x0000000007480000-0x0000000007516000-memory.dmp

Filesize
600KB

Download
memory/3508-78-0x00000000073F0000-0x0000000007401000-memory.dmp

Filesize
68KB

Download
memory/3508-79-0x0000000007430000-0x000000000743E000-memory.dmp

Filesize
56KB

Download
memory/4508-60-0x000000001CBC0000-0x000000001CC72000-memory.dmp

Filesize
712KB

Download
memory/4508-59-0x000000001CAB0000-0x000000001CB00000-memory.dmp

Filesize
320KB

Download
memory/4816-31-0x00000000008C0000-0x0000000000BE4000-memory.dmp

Filesize
3.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads