juko | 34116fad3543b28d29d20e4105e372cf00def71a83d92b7c48e69dfe0f376f32

General

Target
2026-05-19_c04675f6702cad03e0cd44372801112f_elex_wannacry.exe
Size 49KB
Sample260519-rx1t7ae151
SHA256 34116fad3543b28d29d20e4105e372cf00def71a83d92b7c48e69dfe0f376f32
MD5 c04675f6702cad03e0cd44372801112f
SHA1 a155d58359891041ff6d862009c266fca32de964
SHA512 61ef82ca2171e1da6702566c463d100623274ff0351246d3b45d4ba1381747873d39d63e631afcb8361d649a4123b9a83b2b08baa4805baa39a9fc4d4ac7dbb0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2l:VLy2Kerc64CiGImVucp4kojWh2l
TLSH
T1ED334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA740765A1C72D6BCF30E9E
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
behavioral1/memory/3296-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00080000000242ee-5.dat	family_juko
behavioral1/memory/3296-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3604-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00090000000242f1-15.dat	family_juko
behavioral1/memory/1640-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1640-18-0x0000000000400000-0x0000000000420000-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	2026-05-19_c04675f6702cad03e0cd44372801112f_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3604	WINWORD.exe
1640	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	2026-05-19_c04675f6702cad03e0cd44372801112f_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
332	PING.EXE
540	cmd.exe
3760	PING.EXE
552	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3760	PING.EXE
552	PING.EXE
332	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3296 wrote to memory of 3604	3296	2026-05-19_c04675f6702cad03e0cd44372801112f_elex_wannacry.exe	88
PID 3604 wrote to memory of 540	3604	WINWORD.exe	89
PID 540 wrote to memory of 3760	540	cmd.exe	91
PID 540 wrote to memory of 552	540	cmd.exe	92
PID 540 wrote to memory of 332	540	cmd.exe	93
PID 540 wrote to memory of 1640	540	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-05-19_c04675f6702cad03e0cd44372801112f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-19_c04675f6702cad03e0cd44372801112f_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3296
- 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:3604
- - 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\00007A56" 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:540
  - - 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:3760
  - - 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:552
  - - 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:332
  - - 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:1640

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

00007A56

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007A56
Size 49KB
SHA256 674dd9003f81226349b8f8319bb9ff8eb3b1a2504a8f9fd2af81ef33b3183ae5
MD5 66c59c03fa777ad5e229271067095637
SHA1 9b15251baa15c82ee495a0f019e11b5f2096d923
SHA512 807a91ad2b3cc6c79d2bcc50483f013fa6aae1aaab2293b622383a4f550386d6dc4e200ae14d3785fa9f73062c2faad0fe6dde8e3ecf71a9569a0095129d3669
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h26:VLy2Kerc64CiGImVucp4kojWh26
TLSH
T144334B0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 34116fad3543b28d29d20e4105e372cf00def71a83d92b7c48e69dfe0f376f32
MD5 c04675f6702cad03e0cd44372801112f
SHA1 a155d58359891041ff6d862009c266fca32de964
SHA512 61ef82ca2171e1da6702566c463d100623274ff0351246d3b45d4ba1381747873d39d63e631afcb8361d649a4123b9a83b2b08baa4805baa39a9fc4d4ac7dbb0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2l:VLy2Kerc64CiGImVucp4kojWh2l
TLSH
T1ED334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1640-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1640-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3296-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3296-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3604-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads