juko | 733abeee6288343667ea74e4695792d66ac7802f65c381c7087c5770d9e91c00

General

Target
2026-07-19_25729ecd0ccfee76be5ba428993f2bff_elex_wannacry.exe
Size 94KB
Sample260719-dvbwdsdw4v
SHA256 733abeee6288343667ea74e4695792d66ac7802f65c381c7087c5770d9e91c00
MD5 25729ecd0ccfee76be5ba428993f2bff
SHA1 46e2ebaa6a8cc06ad8c74794bf2d28f66a58b6bc
SHA512 ec7de976216c61edda03419d864a9c62df5ad7ccc49342d9883e8c558d6cb6a04c8d0c063477cdad968de9fbc881a9dd7ca361024a22af32bbd092670ee38762
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/N9:RLy2Kerc64CiGImFYgUBWTb4/N9
TLSH
T172937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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
behavioral1/memory/60-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x00080000000243c3-5.dat	family_juko
behavioral1/memory/2700-11-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/60-13-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/2700-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x00080000000243c4-16.dat	family_juko
behavioral1/memory/5012-18-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/5012-19-0x0000000000400000-0x000000000042B000-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	2026-07-19_25729ecd0ccfee76be5ba428993f2bff_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
2700	WINWORD.exe
5012	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

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
4884	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	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	2026-07-19_25729ecd0ccfee76be5ba428993f2bff_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

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
4648	PING.EXE
828	PING.EXE
4884	cmd.exe
552	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
552	PING.EXE
4648	PING.EXE
828	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 60 wrote to memory of 2700	60	2026-07-19_25729ecd0ccfee76be5ba428993f2bff_elex_wannacry.exe	86
PID 2700 wrote to memory of 4884	2700	WINWORD.exe	87
PID 4884 wrote to memory of 552	4884	cmd.exe	89
PID 4884 wrote to memory of 4648	4884	cmd.exe	90
PID 4884 wrote to memory of 828	4884	cmd.exe	92
PID 4884 wrote to memory of 5012	4884	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-19_25729ecd0ccfee76be5ba428993f2bff_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-19_25729ecd0ccfee76be5ba428993f2bff_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:60
- 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:2700
- - 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\00007229" 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:4884
  - - 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:4648
  - - 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:828
  - - 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:5012

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

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

00007229

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007229
Size 94KB
SHA256 1843cad15092033a5ca6adbce363c75edc48cc14f8b283e3493b4ea88a1b4454
MD5 6fe0ac93597144862c3811d1013de2f7
SHA1 c5b805b3673e20f5a23bd6290b3f3581355c21bd
SHA512 53e4b0535ed72f3e95f2aaf3808846f11b25a0f39a577c2bbec3f36039617acc77ae0a59d8d72c711bc34f46cf9deee3e8a6c12f518fbff700270175c7b96063
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/N5:RLy2Kerc64CiGImFYgUBWTb4/N5
TLSH
T133937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 733abeee6288343667ea74e4695792d66ac7802f65c381c7087c5770d9e91c00
MD5 25729ecd0ccfee76be5ba428993f2bff
SHA1 46e2ebaa6a8cc06ad8c74794bf2d28f66a58b6bc
SHA512 ec7de976216c61edda03419d864a9c62df5ad7ccc49342d9883e8c558d6cb6a04c8d0c063477cdad968de9fbc881a9dd7ca361024a22af32bbd092670ee38762
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/N9:RLy2Kerc64CiGImFYgUBWTb4/N9
TLSH
T172937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/60-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/60-13-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2700-11-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2700-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5012-18-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5012-19-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads