juko | 3854ff63837168863cf7deb01f0091cab5eea8387ea32f7642399f071237d3f3

General

Target
2026-08-09_d755ad2ff122eecc87af3e78af83e2d1_elex_wannacry.exe
Size 30KB
Sample260809-tcd6sshm9w
SHA256 3854ff63837168863cf7deb01f0091cab5eea8387ea32f7642399f071237d3f3
MD5 d755ad2ff122eecc87af3e78af83e2d1
SHA1 9e74e1c5acc82255a197d5a511706f8c94fb69a9
SHA512 4e6ae35d4d38bdaef73067864d5dc86d8dfb121f9256bc866b1f593161c751037e7a1f2a8f9999d47c1044df687533f0771be6d8016a8104e769b8c7832c787d
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrw:OLsF2Kerc64sTiX2IV0DkFMw
TLSH
T187E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
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 2 IoCs

resource	yara_rule
behavioral1/files/0x000800000002449e-4.dat	family_juko
behavioral1/files/0x000900000002449f-9.dat	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-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	2026-08-09_d755ad2ff122eecc87af3e78af83e2d1_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4616	WINWORD.exe
2516	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-1-5-21-1788976790-1541110888-1636651838-1000\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
3944	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	2026-08-09_d755ad2ff122eecc87af3e78af83e2d1_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
3944	cmd.exe
4444	PING.EXE
1916	PING.EXE
2300	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4444	PING.EXE
1916	PING.EXE
2300	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5080 wrote to memory of 4616	5080	2026-08-09_d755ad2ff122eecc87af3e78af83e2d1_elex_wannacry.exe	84
PID 4616 wrote to memory of 3944	4616	WINWORD.exe	85
PID 3944 wrote to memory of 4444	3944	cmd.exe	87
PID 3944 wrote to memory of 1916	3944	cmd.exe	90
PID 3944 wrote to memory of 2300	3944	cmd.exe	93
PID 3944 wrote to memory of 2516	3944	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-09_d755ad2ff122eecc87af3e78af83e2d1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_d755ad2ff122eecc87af3e78af83e2d1_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5080
- 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:4616
- - 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\00003404" 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:3944
  - - 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:4444
  - - 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:1916
  - - 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:2300
  - - 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:2516

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

00003404

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003404
Size 30KB
SHA256 c42205717149e376da1a27392e090200714fc2fe662f0b1c638dd98aa2e8c654
MD5 a42353bdefabf4914db99bf98d7431ad
SHA1 e8b3446c4c0859d671781cbd0f901b03f0667598
SHA512 8d9e1c3c32c6cc013f56d1a08d55198bfbed6e760d51c6a013219645606273c255468c858598b0549cdfa209150ce5fd21b58717a67afa35ed9c6d4b90aeab15
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrI:OLsF2Kerc64sTiX2IV0DkFMI
TLSH
T1C2E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 3854ff63837168863cf7deb01f0091cab5eea8387ea32f7642399f071237d3f3
MD5 d755ad2ff122eecc87af3e78af83e2d1
SHA1 9e74e1c5acc82255a197d5a511706f8c94fb69a9
SHA512 4e6ae35d4d38bdaef73067864d5dc86d8dfb121f9256bc866b1f593161c751037e7a1f2a8f9999d47c1044df687533f0771be6d8016a8104e769b8c7832c787d
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrw:OLsF2Kerc64sTiX2IV0DkFMw
TLSH
T187E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads