quasar | 6c53c6883113580b6118856a433c5b2fb49a208e33d2faedb77d1e8609919af9

Analysis

max time kernel
134s
max time network
138s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
24/11/2024, 16:43

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General

Target
39234b4b1387d417161e87d99f46f5d4.exe
Size 3.2MB
Sample241124-t8d6nsymft
SHA256 6c53c6883113580b6118856a433c5b2fb49a208e33d2faedb77d1e8609919af9
MD5 39234b4b1387d417161e87d99f46f5d4
SHA1 1b9239eea2e7cbf721cc4b71a7397ea49d3d0348
SHA512 0afaf23be317dafb306365e21134a00aeb650b5bb1749d8e65f9361a67200c417c042233704f01628609ca3f2c2ed9295cdcb0b945a74b99ef9e1dee541a3817
SSDEEP 49152:lnvnI22SsaNYfdPBldt698dBcjHGcHZmzO8oGdG6THHB72eh2NT:lnvI22SsaNYfdPBldt6+dBcjHGcHQ
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar ddns discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

DDNS

193.161.193.99:32471

Mutex

807f3187-d087-4fff-beff-e73293a32af8

Attributes

encryption_key
81A0C14D4C705B3C678E573C849DE7F6A3671A8B
install_name
jusched.exe
log_directory
CachedLogs
reconnect_delay
3000
startup_key
Java Update Scheduler
subdirectory
Java

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/files/0x000d000000023b33-4.dat	family_quasar
behavioral2/memory/2888-14-0x0000000000B90000-0x0000000000EB4000-memory.dmp	family_quasar

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	39234b4b1387d417161e87d99f46f5d4.exe

Executes dropped EXE 2 IoCs

pid	Process
2888	JUSCHED.EXE
3196	jusched.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 1 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	39234b4b1387d417161e87d99f46f5d4.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000_Classes\Local Settings	39234b4b1387d417161e87d99f46f5d4.exe
Key created	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000_Classes\Local Settings	OpenWith.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
828	schtasks.exe
4692	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2888	JUSCHED.EXE
Token: SeDebugPrivilege	3196	jusched.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
3196	jusched.exe
3196	jusched.exe

Suspicious use of SendNotifyMessage 2 IoCs

pid	Process
3196	jusched.exe
3196	jusched.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
216	OpenWith.exe
3196	jusched.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4620 wrote to memory of 2888	4620	39234b4b1387d417161e87d99f46f5d4.exe	84
PID 4620 wrote to memory of 2888	4620	39234b4b1387d417161e87d99f46f5d4.exe	84
PID 2888 wrote to memory of 828	2888	JUSCHED.EXE	86
PID 2888 wrote to memory of 828	2888	JUSCHED.EXE	86
PID 2888 wrote to memory of 3196	2888	JUSCHED.EXE	88
PID 2888 wrote to memory of 3196	2888	JUSCHED.EXE	88
PID 3196 wrote to memory of 4692	3196	jusched.exe	89
PID 3196 wrote to memory of 4692	3196	jusched.exe	89

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\39234b4b1387d417161e87d99f46f5d4.exe
"C:\Users\Admin\AppData\Local\Temp\39234b4b1387d417161e87d99f46f5d4.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4620
- C:\Users\Admin\AppData\Local\Temp\JUSCHED.EXE
  "C:\Users\Admin\AppData\Local\Temp\JUSCHED.EXE"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2888
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Java Update Scheduler" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Java\jusched.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:828
- - C:\Users\Admin\AppData\Roaming\Java\jusched.exe
    "C:\Users\Admin\AppData\Roaming\Java\jusched.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3196
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Java Update Scheduler" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Java\jusched.exe" /rl HIGHEST /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4692

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:216

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

jusched.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\jusched.exe.log
Size 1KB
SHA256 ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924
MD5 baf55b95da4a601229647f25dad12878
SHA1 abc16954ebfd213733c4493fc1910164d825cac8
SHA512 24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545
MD5 SHA1 SHA512

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JUSCHED.EXE

Path C:\Users\Admin\AppData\Local\Temp\JUSCHED.EXE
Size 3.1MB
SHA256 acfffb20520bcc954ecf5cc107521efa96c76b0a43e61a83628f580dae87c996
MD5 de7dbb5ed397ff41da4b1de1af4fbac5
SHA1 fcf8b29628d4cae9109b642c3a65a20178cca98a
SHA512 182afaabf28848d5ea2f2a55dc6e7ac5d1903f97e0f0640710e1ff8470c31f01ba68c0d8c548f16261a13a29488c34c91b61a2f8b958736eae126b766a42c5d8
SSDEEP 49152:pvnI22SsaNYfdPBldt698dBcjHGcHZmzO8oGdG6THHB72eh2NT:pvI22SsaNYfdPBldt6+dBcjHGcHQ
MD5 SHA1 SHA512 SSDEEP

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memory/2888-13-0x00007FFA367A3000-0x00007FFA367A5000-memory.dmp

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memory/2888-14-0x0000000000B90000-0x0000000000EB4000-memory.dmp

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memory/2888-15-0x00007FFA367A0000-0x00007FFA37261000-memory.dmp

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memory/2888-23-0x00007FFA367A0000-0x00007FFA37261000-memory.dmp

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memory/3196-24-0x000000001C0C0000-0x000000001C110000-memory.dmp

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memory/3196-25-0x000000001C1D0000-0x000000001C282000-memory.dmp

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memory/3196-28-0x000000001C170000-0x000000001C182000-memory.dmp

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memory/3196-29-0x000000001C8D0000-0x000000001C90C000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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