quasar | 4bcbb8983fe7425976c5a1789deff73fb138e80981f5ebfef1f835bcc6757760

max time kernel
148s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20250410-en
resource tags

arch:x64arch:x86image:win10v2004-20250410-enlocale:en-usos:windows10-2004-x64system
submitted
25/04/2025, 14:35

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General

Target
f5cb51ffdb87e6d78da4a60b2a83a2c0.exe
Size 271KB
Sample250425-ryf66svsby
SHA256 cc18af46043434e99591546067f4ac5c031656cc3493d80396c4eb461e2d6cc9
MD5 f5cb51ffdb87e6d78da4a60b2a83a2c0
SHA1 f707cebf3b837c0f5b7724f125a5eb5acf622e6b
SHA512 883970f6caecb15195108d25014a5faeaf2a1ce3a0c3f888da7d51bee3ad57f95abdf55a14748e25af39d0697fab6c1ad9fd5958efc2cc14ea279e099baf0610
SSDEEP 3072:7aaXQh1zKfB0OZpbsxFqc9pI9sjBO1z+5X0uuMmk9b+3ZrQE8Ne5oKk3XsXMSrZS:7aaXMzUmOZoqEIaNOyEObyQEJ5o5eM
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar discovery persistence spyware trojan

Malware Config

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/4936-1-0x00000000000B0000-0x00000000000F8000-memory.dmp	family_quasar
behavioral2/files/0x000200000001e71c-12.dat	family_quasar

Executes dropped EXE 2 IoCs

pid	Process
4612	strln32.exe
4800	strln32.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\OfficeMalbert2010 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\f5cb51ffdb87e6d78da4a60b2a83a2c0.exe\""	f5cb51ffdb87e6d78da4a60b2a83a2c0.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\OfficeMalbert2010 = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\strln32.exe\""	strln32.exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
43	api.ipify.org
51	api.ipify.org

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f5cb51ffdb87e6d78da4a60b2a83a2c0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	strln32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f5cb51ffdb87e6d78da4a60b2a83a2c0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	strln32.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4936	f5cb51ffdb87e6d78da4a60b2a83a2c0.exe
Token: SeDebugPrivilege	4612	strln32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4612	strln32.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4936 wrote to memory of 4612	4936	f5cb51ffdb87e6d78da4a60b2a83a2c0.exe	101
PID 4936 wrote to memory of 4612	4936	f5cb51ffdb87e6d78da4a60b2a83a2c0.exe	101
PID 4936 wrote to memory of 4612	4936	f5cb51ffdb87e6d78da4a60b2a83a2c0.exe	101
PID 704 wrote to memory of 980	704	cmd.exe	102
PID 704 wrote to memory of 980	704	cmd.exe	102
PID 704 wrote to memory of 980	704	cmd.exe	102
PID 4540 wrote to memory of 4800	4540	cmd.exe	105
PID 4540 wrote to memory of 4800	4540	cmd.exe	105
PID 4540 wrote to memory of 4800	4540	cmd.exe	105

C:\Users\Admin\AppData\Local\Temp\f5cb51ffdb87e6d78da4a60b2a83a2c0.exe
"C:\Users\Admin\AppData\Local\Temp\f5cb51ffdb87e6d78da4a60b2a83a2c0.exe"
1⤵
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4936
- C:\Users\Admin\AppData\Roaming\SubDir\strln32.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\strln32.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:4612

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\f5cb51ffdb87e6d78da4a60b2a83a2c0.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:704
- C:\Users\Admin\AppData\Local\Temp\f5cb51ffdb87e6d78da4a60b2a83a2c0.exe
  C:\Users\Admin\AppData\Local\Temp\f5cb51ffdb87e6d78da4a60b2a83a2c0.exe
  2⤵
  - System Location Discovery: System Language Discovery
  PID:980

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Roaming\SubDir\strln32.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4540
- C:\Users\Admin\AppData\Roaming\SubDir\strln32.exe
  C:\Users\Admin\AppData\Roaming\SubDir\strln32.exe
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:4800

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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f5cb51ffdb87e6d78da4a60b2a83a2c0.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\f5cb51ffdb87e6d78da4a60b2a83a2c0.exe.log
Size 1KB
SHA256 234381ea204c431d0936c4141a38381629938e4f5d40dd0ef01de6a282abbae7
MD5 8013ca45a4b68a281377f2c7b517ac8a
SHA1 aff79b7c8f408e5ae6f00cf9d83e2fd95d9affc3
SHA512 428305df713c12d2165303a9b0433c83a0e3f3088a9551deb6403e9351814c38c2377e7c22ede57bcd23ca764e02fce431c52aba6bf4b998b89a518129fda2d6
MD5 SHA1 SHA512

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strln32.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\strln32.exe
Size 271KB
SHA256 cc18af46043434e99591546067f4ac5c031656cc3493d80396c4eb461e2d6cc9
MD5 f5cb51ffdb87e6d78da4a60b2a83a2c0
SHA1 f707cebf3b837c0f5b7724f125a5eb5acf622e6b
SHA512 883970f6caecb15195108d25014a5faeaf2a1ce3a0c3f888da7d51bee3ad57f95abdf55a14748e25af39d0697fab6c1ad9fd5958efc2cc14ea279e099baf0610
SSDEEP 3072:7aaXQh1zKfB0OZpbsxFqc9pI9sjBO1z+5X0uuMmk9b+3ZrQE8Ne5oKk3XsXMSrZS:7aaXMzUmOZoqEIaNOyEObyQEJ5o5eM
MD5 SHA1 SHA512 SSDEEP

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memory/980-21-0x0000000074F80000-0x0000000075730000-memory.dmp

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memory/980-20-0x0000000074F80000-0x0000000075730000-memory.dmp

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memory/980-19-0x0000000074F80000-0x0000000075730000-memory.dmp

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memory/4612-24-0x00000000064F0000-0x00000000064FA000-memory.dmp

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memory/4612-22-0x0000000074F80000-0x0000000075730000-memory.dmp

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memory/4612-18-0x0000000074F80000-0x0000000075730000-memory.dmp

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memory/4612-15-0x0000000074F80000-0x0000000075730000-memory.dmp

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memory/4936-4-0x0000000004A60000-0x0000000004AC6000-memory.dmp

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memory/4936-8-0x0000000074F80000-0x0000000075730000-memory.dmp

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memory/4936-16-0x0000000074F80000-0x0000000075730000-memory.dmp

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memory/4936-7-0x0000000074F8E000-0x0000000074F8F000-memory.dmp

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memory/4936-6-0x0000000004F20000-0x0000000004F32000-memory.dmp

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memory/4936-5-0x0000000074F80000-0x0000000075730000-memory.dmp

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memory/4936-0-0x0000000074F8E000-0x0000000074F8F000-memory.dmp

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memory/4936-3-0x00000000049C0000-0x0000000004A52000-memory.dmp

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memory/4936-2-0x0000000004F70000-0x0000000005514000-memory.dmp

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memory/4936-1-0x00000000000B0000-0x00000000000F8000-memory.dmp

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Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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