juko | 2ce847e82c47c5575b6aabf983d953dd3efb2cd73dc40c29626143c0586a9912

General

Target
2026-04-15_238d741ff5c38520f08884517b4dd32f_elex_wannacry.exe
Size 48KB
Sample260415-21ca4sdz2x
SHA256 2ce847e82c47c5575b6aabf983d953dd3efb2cd73dc40c29626143c0586a9912
MD5 238d741ff5c38520f08884517b4dd32f
SHA1 f3e6f362f87b5dde6f5a0edaedacef3382c66f86
SHA512 7682440ab2537d28eb6af774205e5237a077701df7a8ab400aa9cdb8c638da2f6116ad23cb37442fa1b738f8728e669e3af22b908b85412f6969ab027c1c4440
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8x:bLy2Kerc64CiGImav42j05
TLSH
T15C234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252D76E23CF77D8D
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/4208-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x001400000001efa2-5.dat	family_juko
behavioral1/memory/4208-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3688-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3688-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000400000002316f-16.dat	family_juko
behavioral1/memory/5168-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/5168-19-0x0000000000400000-0x0000000000420000-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-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	2026-04-15_238d741ff5c38520f08884517b4dd32f_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3688	WINWORD.exe
5168	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-1-5-21-914486190-3969805341-592249730-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-15_238d741ff5c38520f08884517b4dd32f_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

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
1960	cmd.exe
2120	PING.EXE
2320	PING.EXE
3328	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2120	PING.EXE
2320	PING.EXE
3328	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4208 wrote to memory of 3688	4208	2026-04-15_238d741ff5c38520f08884517b4dd32f_elex_wannacry.exe	87
PID 3688 wrote to memory of 1960	3688	WINWORD.exe	88
PID 1960 wrote to memory of 2120	1960	cmd.exe	90
PID 1960 wrote to memory of 2320	1960	cmd.exe	91
PID 1960 wrote to memory of 3328	1960	cmd.exe	92
PID 1960 wrote to memory of 5168	1960	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-04-15_238d741ff5c38520f08884517b4dd32f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-15_238d741ff5c38520f08884517b4dd32f_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4208
- 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:3688
- - 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\00001FAF" 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:1960
  - - 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:2120
  - - 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:2320
  - - 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:3328
  - - 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:5168

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

00001FAF

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001FAF
Size 48KB
SHA256 8f570cf2676f2ba2a122c499092cf58b1a69c86909d6d80b0ddd055af43be989
MD5 f397c95f6b51a89ffb4b73bd70a8b191
SHA1 df50be5cf0993d8229dfed378a9c1c2ec88dbcce
SHA512 111b3c995ba7c2884f1cb2b0b16f5f2a4427eb4a5b7964001ad9765a30291179c75855557ac155fe59f160220d582ae9004a8297e908f7bd126becd29592543b
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8c:bLy2Kerc64CiGImav42j00
TLSH
T126234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 2ce847e82c47c5575b6aabf983d953dd3efb2cd73dc40c29626143c0586a9912
MD5 238d741ff5c38520f08884517b4dd32f
SHA1 f3e6f362f87b5dde6f5a0edaedacef3382c66f86
SHA512 7682440ab2537d28eb6af774205e5237a077701df7a8ab400aa9cdb8c638da2f6116ad23cb37442fa1b738f8728e669e3af22b908b85412f6969ab027c1c4440
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8x:bLy2Kerc64CiGImav42j05
TLSH
T15C234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252D76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3688-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3688-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4208-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4208-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5168-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5168-19-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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