juko | 66941b858a1c41375473c49bdc1fb5db641f484012fb4b38e48c1e5dd0be009e

General

Target
2026-07-04_1c5c25ec8c1a0ed4cc0147a43b748456_elex_wannacry.exe
Size 49KB
Sample260704-e2d5rsfs7j
SHA256 66941b858a1c41375473c49bdc1fb5db641f484012fb4b38e48c1e5dd0be009e
MD5 1c5c25ec8c1a0ed4cc0147a43b748456
SHA1 212f8e9d7be2f373cff682c1fb23d91c860358a5
SHA512 772a55449bd99c0dfc66b8d9e3f9dfe36e0a472af66b124eae6714e19ea4696aee8754def38337011adc86998a2083a6a51b28cc96a20531262a8491bbcc8790
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h25:VLy2Kerc64CiGImVucp4kojWh25
TLSH
T118334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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 8 IoCs

resource	yara_rule
behavioral1/memory/2336-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x001e000000016810-5.dat	family_juko
behavioral1/memory/3756-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2336-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3756-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0009000000024431-16.dat	family_juko
behavioral1/memory/2156-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2156-19-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 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-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	2026-07-04_1c5c25ec8c1a0ed4cc0147a43b748456_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
3756	WINWORD.exe
2156	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-1-5-21-204488895-2999877624-296153668-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-04_1c5c25ec8c1a0ed4cc0147a43b748456_elex_wannacry.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
3340	PING.EXE
3068	PING.EXE
2476	cmd.exe
5064	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5064	PING.EXE
3340	PING.EXE
3068	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2336 wrote to memory of 3756	2336	2026-07-04_1c5c25ec8c1a0ed4cc0147a43b748456_elex_wannacry.exe	86
PID 3756 wrote to memory of 2476	3756	WINWORD.exe	87
PID 2476 wrote to memory of 5064	2476	cmd.exe	89
PID 2476 wrote to memory of 3340	2476	cmd.exe	91
PID 2476 wrote to memory of 3068	2476	cmd.exe	92
PID 2476 wrote to memory of 2156	2476	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-04_1c5c25ec8c1a0ed4cc0147a43b748456_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-04_1c5c25ec8c1a0ed4cc0147a43b748456_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2336
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3756
- - 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\00002134" 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:2476
  - - 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:5064
  - - 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:3340
  - - 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:3068
  - - 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:2156

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00002134

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002134
Size 49KB
SHA256 e235d7d23db7fd4deb3bc954ee9b9aaea5d65eddfc14bbf55ed557c2a29e7bc9
MD5 a4fbb0c7130f512a23cc793dee207b1d
SHA1 31b28a88a1b2f5a98fcca810a6c3b27d0ddcac3b
SHA512 dfa5d57913e1e4de34458906c60593b488849d8ef8a053d8d1c319b9ae2e18c0630aa7a491636025f8041ae6786ca21b49448c8a19af70fdfadfb8be6f679630
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h21:VLy2Kerc64CiGImVucp4kojWh21
TLSH
T186334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 66941b858a1c41375473c49bdc1fb5db641f484012fb4b38e48c1e5dd0be009e
MD5 1c5c25ec8c1a0ed4cc0147a43b748456
SHA1 212f8e9d7be2f373cff682c1fb23d91c860358a5
SHA512 772a55449bd99c0dfc66b8d9e3f9dfe36e0a472af66b124eae6714e19ea4696aee8754def38337011adc86998a2083a6a51b28cc96a20531262a8491bbcc8790
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h25:VLy2Kerc64CiGImVucp4kojWh25
TLSH
T118334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2156-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2156-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2336-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2336-13-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3756-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3756-15-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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