juko | 42b0ca6b3dd0b457db06ed63cb9c439a70e3fb63b31eba2a50716f264c13499b

General

Target
2026-08-09_2c48a0af14f12b5ff235dad3611e0aa2_elex_wannacry.exe
Size 49KB
Sample260809-esmesazerg
SHA256 42b0ca6b3dd0b457db06ed63cb9c439a70e3fb63b31eba2a50716f264c13499b
MD5 2c48a0af14f12b5ff235dad3611e0aa2
SHA1 9a5210ecbe913dad9e3fbcb04cb780163924e15f
SHA512 b60a319075b4220ae8452a5714006ad91ceb2cd1d2fa5f66050842d2eab43e608dab4a880ca2ba814752e090bed3e6d0c791b34e08e9138b505c62a1d91c91e6
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2A:VLy2Kerc64CiGImVucp4kojWh2A
TLSH
T192334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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 8 IoCs

resource	yara_rule
behavioral2/memory/4468-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d000000016cdc-5.dat	family_juko
behavioral2/memory/5804-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4468-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5804-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c5d1-14.dat	family_juko
behavioral2/memory/2284-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2284-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5804	WINWORD.exe
2284	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-1-5-21-552508041-2681165170-3229858294-1000\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
5136	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	2026-08-09_2c48a0af14f12b5ff235dad3611e0aa2_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
4876	PING.EXE
2512	PING.EXE
5136	cmd.exe
4604	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4604	PING.EXE
4876	PING.EXE
2512	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4468 wrote to memory of 5804	4468	2026-08-09_2c48a0af14f12b5ff235dad3611e0aa2_elex_wannacry.exe	89
PID 5804 wrote to memory of 5136	5804	WINWORD.exe	90
PID 5136 wrote to memory of 4604	5136	cmd.exe	92
PID 5136 wrote to memory of 4876	5136	cmd.exe	93
PID 5136 wrote to memory of 2512	5136	cmd.exe	94
PID 5136 wrote to memory of 2284	5136	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_2c48a0af14f12b5ff235dad3611e0aa2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_2c48a0af14f12b5ff235dad3611e0aa2_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4468
- 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:5804
- - 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\00004449" 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:5136
  - - 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:4604
  - - 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:4876
  - - 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:2512
  - - 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:2284

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

00004449

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004449
Size 49KB
SHA256 ae4903bac77cb6a35695a2fdb0cd187ed942a3f17b162ac1e2e0c31d7849255e
MD5 3cb0f88c68c840dbfc0ef7d437df0d28
SHA1 8c93618de9c56daa07428d83838a1f1ce7d62db0
SHA512 c4ec9e08ddc4793c98d5b1fd340d12f4acef8b6b1cb26a8fce5f17a194b531064220a1b93e04f35fbc4c6c083486e2039e1b3a6130b329847ff959849d2eadc8
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2F:VLy2Kerc64CiGImVucp4kojWh2F
TLSH
T169334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA750765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 42b0ca6b3dd0b457db06ed63cb9c439a70e3fb63b31eba2a50716f264c13499b
MD5 2c48a0af14f12b5ff235dad3611e0aa2
SHA1 9a5210ecbe913dad9e3fbcb04cb780163924e15f
SHA512 b60a319075b4220ae8452a5714006ad91ceb2cd1d2fa5f66050842d2eab43e608dab4a880ca2ba814752e090bed3e6d0c791b34e08e9138b505c62a1d91c91e6
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2A:VLy2Kerc64CiGImVucp4kojWh2A
TLSH
T192334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2284-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2284-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4468-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4468-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5804-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5804-13-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads