juko | ce2346e84b2c7794d00f5a6f327085f840edb1386cefa9e71b52b048bd8d97c4

General

Target
2026-05-27_b17a65d2c518332615f837ccac61849c_elex_wannacry.exe
Size 88KB
Sample260527-e9b1dahw5x
SHA256 ce2346e84b2c7794d00f5a6f327085f840edb1386cefa9e71b52b048bd8d97c4
MD5 b17a65d2c518332615f837ccac61849c
SHA1 45c4c2e5ad4af7b66de2d0f24cb6555c89fbc42d
SHA512 0595a9d37e9d121a42c936615e97d0edae2c26c9e6da6b8a20bbce083a6dc8e06af45497160a3a72e342bd37ba3b26d3964a17c739d142be0be653d31d447772
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsY:zLy2Kerc64CiGImHc/28wzCBlycJWee/
TLSH
T174933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

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

Detects Juko 7 IoCs

resource	yara_rule
behavioral2/memory/5020-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000c00000002aead-5.dat	family_juko
behavioral2/memory/5020-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/3220-14-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b44e-15.dat	family_juko
behavioral2/memory/3836-17-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/3836-18-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3220	WINWORD.exe
3836	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-1-5-21-2654269261-3199571979-4291878722-1000\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

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	2026-05-27_b17a65d2c518332615f837ccac61849c_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
4948	cmd.exe
3416	PING.EXE
408	PING.EXE
1272	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3416	PING.EXE
408	PING.EXE
1272	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5020 wrote to memory of 3220	5020	2026-05-27_b17a65d2c518332615f837ccac61849c_elex_wannacry.exe	81
PID 3220 wrote to memory of 4948	3220	WINWORD.exe	82
PID 4948 wrote to memory of 3416	4948	cmd.exe	84
PID 4948 wrote to memory of 408	4948	cmd.exe	85
PID 4948 wrote to memory of 1272	4948	cmd.exe	86
PID 4948 wrote to memory of 3836	4948	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-05-27_b17a65d2c518332615f837ccac61849c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-27_b17a65d2c518332615f837ccac61849c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5020
- 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:3220
- - 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\0000125F" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4948
  - - 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:3416
  - - 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:408
  - - 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:1272
  - - 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:3836

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

0000125F

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000125F
Size 88KB
SHA256 b07e09462f432920df8c4001f281979846a1b21382cd1a052351cb5f7ada08a5
MD5 0257ed92fe0a8f40416578fca439b6a9
SHA1 ba888d9dc555eb0e93b409152665ad33053b3f91
SHA512 45e4f0e8b373b224a0abaf89054c67424a7f65435d96efbbf18c10039af5e2b8585a2b9500d138f9887307390c56dcc011791eff04d4f79bc86e89d290e2db95
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs6:zLy2Kerc64CiGImHc/28wzCBlycJWeeB
TLSH
T112933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 ce2346e84b2c7794d00f5a6f327085f840edb1386cefa9e71b52b048bd8d97c4
MD5 b17a65d2c518332615f837ccac61849c
SHA1 45c4c2e5ad4af7b66de2d0f24cb6555c89fbc42d
SHA512 0595a9d37e9d121a42c936615e97d0edae2c26c9e6da6b8a20bbce083a6dc8e06af45497160a3a72e342bd37ba3b26d3964a17c739d142be0be653d31d447772
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsY:zLy2Kerc64CiGImHc/28wzCBlycJWee/
TLSH
T174933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3220-14-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3836-17-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3836-18-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5020-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5020-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads