juko | 773296e5cbdf636001263c9117d0f80d274c2e8aba48a5c2f2c49da379378be9

General

Target
2026-08-31_f57a6ecaac8a88cf47e512a7c518847a_elex_wannacry.exe
Size 52KB
Sample260831-pyvnfssckb
SHA256 773296e5cbdf636001263c9117d0f80d274c2e8aba48a5c2f2c49da379378be9
MD5 f57a6ecaac8a88cf47e512a7c518847a
SHA1 496a0173e2b67bb806741c66ffdd4911080a5c84
SHA512 458973b707de2dede7cef3e7f6c166e28624991d1e16df52147872cc3496500ed27ac72dab5d72b61e1ac6e64c76544808c77783d9d5e87c1eed702ed18a0da6
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsX:sLy2Kerc64CiGImVuX/N81rRLoT
TLSH
T11F336B06FAEC5FD0F55309B0EAA50E74707D5CF54267E42AE70036582876E22CF61B9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 6 IoCs

resource	yara_rule
behavioral2/memory/4900-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000b000000019caa-5.dat	family_juko
behavioral2/memory/4900-10-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/4092-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c61c-13.dat	family_juko
behavioral2/memory/4940-15-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4092	WINWORD.exe
4940	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2301830172-776172150-2531349243-1000\Software\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

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

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
1708	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-31_f57a6ecaac8a88cf47e512a7c518847a_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
1708	cmd.exe
3708	PING.EXE
3188	PING.EXE
3796	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3188	PING.EXE
3796	PING.EXE
3708	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4900 wrote to memory of 4092	4900	2026-08-31_f57a6ecaac8a88cf47e512a7c518847a_elex_wannacry.exe	89
PID 4092 wrote to memory of 1708	4092	WINWORD.exe	90
PID 1708 wrote to memory of 3708	1708	cmd.exe	92
PID 1708 wrote to memory of 3188	1708	cmd.exe	93
PID 1708 wrote to memory of 3796	1708	cmd.exe	94
PID 1708 wrote to memory of 4940	1708	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-31_f57a6ecaac8a88cf47e512a7c518847a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-31_f57a6ecaac8a88cf47e512a7c518847a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4900
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4092
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\000059BC" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:1708
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:3708
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:3188
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:3796
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:4940

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000059BC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000059BC
Size 52KB
SHA256 7401cae96cb4ea4ba76370f939cf2f9ce9e0017f2f10a50576d7acc4f74aff64
MD5 eb14e9ac7f87002547f99bf27c77cd85
SHA1 5858135ba2908c1fa964f7d25467e48785b03979
SHA512 709aa2fbfcf8a23e4f908dd8de58e94ca908f73c8b6c887e5cab047b1f86a90f9d64a6b70f530583d3e81f7c8e5cd18f18a182e84fd61bca9713a0c4c8c48516
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsJ:sLy2Kerc64CiGImVuX/N81rRLot
TLSH
T1AF336B06FAEC5FD0F55309B0EAA50E74707E5CF54267E42AE70036582876E22CF61B9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 52KB
SHA256 773296e5cbdf636001263c9117d0f80d274c2e8aba48a5c2f2c49da379378be9
MD5 f57a6ecaac8a88cf47e512a7c518847a
SHA1 496a0173e2b67bb806741c66ffdd4911080a5c84
SHA512 458973b707de2dede7cef3e7f6c166e28624991d1e16df52147872cc3496500ed27ac72dab5d72b61e1ac6e64c76544808c77783d9d5e87c1eed702ed18a0da6
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsX:sLy2Kerc64CiGImVuX/N81rRLoT
TLSH
T11F336B06FAEC5FD0F55309B0EAA50E74707D5CF54267E42AE70036582876E22CF61B9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4092-12-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/4900-0-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/4900-10-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/4940-15-0x0000000000400000-0x000000000041C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads