juko | 02f1e0739fe8b028874ba822a11ed0d8e033fafcb6b4a34a518045970d9fc5f6

General

Target
2026-08-02_ffffb86b84afd5ca759581e7c15e442f_elex_wannacry.exe
Size 48KB
Sample260802-jhjclaeq21
SHA256 02f1e0739fe8b028874ba822a11ed0d8e033fafcb6b4a34a518045970d9fc5f6
MD5 ffffb86b84afd5ca759581e7c15e442f
SHA1 35f69428c0e96ce3b289ec4866917018f53532c4
SHA512 dd142e11e600589ca27d23f4aec42e4309bad0e69b815b3b1e83996ca1a2f59110a7e7954fff2101b104bb5f809db3584bba3c0ba737572cb41ca02886f6677a
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8Y:bLy2Kerc64CiGImav42j0w
TLSH
T1D7234A2EB5A26068C55390B0E9EA3E31D4357C75013B712AA700BB252E76E23CF77D8D
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/456-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0005000000023208-5.dat	family_juko
behavioral1/memory/2636-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/456-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2636-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000800000002461e-16.dat	family_juko
behavioral1/memory/2236-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2236-19-0x0000000000400000-0x0000000000420000-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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	2026-08-02_ffffb86b84afd5ca759581e7c15e442f_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2636	WINWORD.exe
2236	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-1-5-21-1074038928-2032447174-945360078-1000\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
3448	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-02_ffffb86b84afd5ca759581e7c15e442f_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

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
5000	PING.EXE
3448	cmd.exe
2408	PING.EXE
864	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2408	PING.EXE
864	PING.EXE
5000	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 456 wrote to memory of 2636	456	2026-08-02_ffffb86b84afd5ca759581e7c15e442f_elex_wannacry.exe	85
PID 2636 wrote to memory of 3448	2636	WINWORD.exe	86
PID 3448 wrote to memory of 2408	3448	cmd.exe	88
PID 3448 wrote to memory of 864	3448	cmd.exe	91
PID 3448 wrote to memory of 5000	3448	cmd.exe	94
PID 3448 wrote to memory of 2236	3448	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_ffffb86b84afd5ca759581e7c15e442f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_ffffb86b84afd5ca759581e7c15e442f_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:456
- 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:2636
- - 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\00007FE1" 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:3448
  - - 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:2408
  - - 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:864
  - - 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:5000
  - - 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:2236

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

00007FE1

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007FE1
Size 48KB
SHA256 6758a59f9c82c2024c8001a818836a014d550f15d4c164ec27bd2b9e98e3bb60
MD5 e402770aa8a332e82b8fd4dc63c5242a
SHA1 2d1913a5c55636504975b53bea953c5f9f139f1d
SHA512 417bfd4cabded2fa329564608492dcc498dac18fc73bc98b4f4b466f4b4801247e86bd27a1d76ee5a743a78d68f2492006306c308afe5c340761332e1d75f7e3
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8q:bLy2Kerc64CiGImav42j0C
TLSH
T1EC234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 02f1e0739fe8b028874ba822a11ed0d8e033fafcb6b4a34a518045970d9fc5f6
MD5 ffffb86b84afd5ca759581e7c15e442f
SHA1 35f69428c0e96ce3b289ec4866917018f53532c4
SHA512 dd142e11e600589ca27d23f4aec42e4309bad0e69b815b3b1e83996ca1a2f59110a7e7954fff2101b104bb5f809db3584bba3c0ba737572cb41ca02886f6677a
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8Y:bLy2Kerc64CiGImav42j0w
TLSH
T1D7234A2EB5A26068C55390B0E9EA3E31D4357C75013B712AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/456-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/456-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2236-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2236-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2636-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2636-15-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads