quasar | 4bcbb8983fe7425976c5a1789deff73fb138e80981f5ebfef1f835bcc6757760

Resubmissions

14/04/2025, 07:51

250414-jp1kfssjz9 10

14/04/2025, 07:46

250414-jl9nyssjt9 10

08/04/2025, 15:58

250408-tevasswl18 10

08/04/2025, 14:19

250408-rm2nqsvqw2 10

Analysis

max time kernel
134s
max time network
146s
platform
windows10-ltsc_2021_x64
resource
win10ltsc2021-20250314-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250314-enlocale:en-usos:windows10-ltsc_2021-x64system
submitted
14/04/2025, 07:51

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General

Target

f5cb51ffdb87e6d78da4a60b2a83a2c0.exe
Size

271KB
MD5

f5cb51ffdb87e6d78da4a60b2a83a2c0
SHA1

f707cebf3b837c0f5b7724f125a5eb5acf622e6b
SHA256

cc18af46043434e99591546067f4ac5c031656cc3493d80396c4eb461e2d6cc9
SHA512

883970f6caecb15195108d25014a5faeaf2a1ce3a0c3f888da7d51bee3ad57f95abdf55a14748e25af39d0697fab6c1ad9fd5958efc2cc14ea279e099baf0610
SSDEEP

3072:7aaXQh1zKfB0OZpbsxFqc9pI9sjBO1z+5X0uuMmk9b+3ZrQE8Ne5oKk3XsXMSrZS:7aaXMzUmOZoqEIaNOyEObyQEJ5o5eM

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/4580-1-0x00000000005D0000-0x0000000000618000-memory.dmp	family_quasar
behavioral2/files/0x000800000002818c-7.dat	family_quasar

Executes dropped EXE 2 IoCs

pid	Process
6084	strln32.exe
348	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 1 IoCs

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

flow	ioc
23	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	strln32.exe
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

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4580	f5cb51ffdb87e6d78da4a60b2a83a2c0.exe
Token: SeDebugPrivilege	6084	strln32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
6084	strln32.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4580 wrote to memory of 6084	4580	f5cb51ffdb87e6d78da4a60b2a83a2c0.exe	84
PID 4580 wrote to memory of 6084	4580	f5cb51ffdb87e6d78da4a60b2a83a2c0.exe	84
PID 4580 wrote to memory of 6084	4580	f5cb51ffdb87e6d78da4a60b2a83a2c0.exe	84
PID 3584 wrote to memory of 6020	3584	cmd.exe	85
PID 3584 wrote to memory of 6020	3584	cmd.exe	85
PID 3584 wrote to memory of 6020	3584	cmd.exe	85
PID 3028 wrote to memory of 348	3028	cmd.exe	90
PID 3028 wrote to memory of 348	3028	cmd.exe	90
PID 3028 wrote to memory of 348	3028	cmd.exe	90

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:4580
- 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:6084

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:3584
- C:\Users\Admin\AppData\Local\Temp\f5cb51ffdb87e6d78da4a60b2a83a2c0.exe
  C:\Users\Admin\AppData\Local\Temp\f5cb51ffdb87e6d78da4a60b2a83a2c0.exe
  2⤵
  - System Location Discovery: System Language Discovery
  PID:6020

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:3028
- 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:348

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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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\f5cb51ffdb87e6d78da4a60b2a83a2c0.exe.log

Filesize
1KB

MD5
9f1a962f65a4656f4794a75a9f611c12

SHA1
0d6f96cd188b26b4e44e8e242a44b24733e6a53f

SHA256
5608fc7631b1c335e59b3ebd301e736149d667e45cf728cfb67a2a2c9a67ff8e

SHA512
939005bcfc3e6710363da0e7a049fa326869619744c11ac296b64d3e3cb7e0b76022dadc40ab1e37fb9d979f0df45ae53a8c95b92b5ee1a4840337b7d28fb4e3

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\strln32.exe

Filesize
271KB

MD5
f5cb51ffdb87e6d78da4a60b2a83a2c0

SHA1
f707cebf3b837c0f5b7724f125a5eb5acf622e6b

SHA256
cc18af46043434e99591546067f4ac5c031656cc3493d80396c4eb461e2d6cc9

SHA512
883970f6caecb15195108d25014a5faeaf2a1ce3a0c3f888da7d51bee3ad57f95abdf55a14748e25af39d0697fab6c1ad9fd5958efc2cc14ea279e099baf0610

Download Submit
memory/4580-6-0x0000000005D30000-0x0000000005D42000-memory.dmp

Filesize
72KB

Download
memory/4580-3-0x00000000050B0000-0x0000000005142000-memory.dmp

Filesize
584KB

Download
memory/4580-4-0x0000000005000000-0x0000000005066000-memory.dmp

Filesize
408KB

Download
memory/4580-5-0x0000000074980000-0x0000000075131000-memory.dmp

Filesize
7.7MB

Download
memory/4580-2-0x0000000005660000-0x0000000005C06000-memory.dmp

Filesize
5.6MB

Download
memory/4580-0-0x000000007498E000-0x000000007498F000-memory.dmp

Filesize
4KB

Download
memory/4580-9-0x0000000074980000-0x0000000075131000-memory.dmp

Filesize
7.7MB

Download
memory/4580-1-0x00000000005D0000-0x0000000000618000-memory.dmp

Filesize
288KB

Download
memory/6020-14-0x0000000074980000-0x0000000075131000-memory.dmp

Filesize
7.7MB

Download
memory/6020-12-0x0000000074980000-0x0000000075131000-memory.dmp

Filesize
7.7MB

Download
memory/6020-15-0x0000000074980000-0x0000000075131000-memory.dmp

Filesize
7.7MB

Download
memory/6084-10-0x0000000074980000-0x0000000075131000-memory.dmp

Filesize
7.7MB

Download
memory/6084-13-0x0000000074980000-0x0000000075131000-memory.dmp

Filesize
7.7MB

Download
memory/6084-17-0x0000000006B40000-0x0000000006B4A000-memory.dmp

Filesize
40KB

Download
memory/6084-20-0x0000000074980000-0x0000000075131000-memory.dmp

Filesize
7.7MB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads