juko | 4362e1f68f3edddf7e7f6825057499ce81f5abd5fdd682b31c02bbb3f0aa10e1

General

Target
2026-10-26_e1859dcb03f8b09b0ac5b65337b5c037_elex_wannacry.exe
Size 88KB
Sample261027-e8ygzscf74
SHA256 4362e1f68f3edddf7e7f6825057499ce81f5abd5fdd682b31c02bbb3f0aa10e1
MD5 e1859dcb03f8b09b0ac5b65337b5c037
SHA1 04f347a8e56429bc31e655c2f631c86fcab9eb86
SHA512 461d18aaff497fbe4e3b51b86d74aab847b478fe2ceee535ab0f62c5076fd7f17efacb599262872c8545d496b916fb04c4d01a4f5de4466d5699466f7662d6f8
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrW:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193e
TLSH
T184934B8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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/0x000500000002325d-3.dat	family_juko
behavioral1/files/0x0009000000024399-12.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-1-5-21-895009113-1202185046-1686627690-1000\Control Panel\International\Geo\Nation	2026-10-26_e1859dcb03f8b09b0ac5b65337b5c037_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-895009113-1202185046-1686627690-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4360	WINWORD.exe
4256	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-1-5-21-895009113-1202185046-1686627690-1000\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
3796	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-26_e1859dcb03f8b09b0ac5b65337b5c037_elex_wannacry.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
3796	cmd.exe
452	PING.EXE
3740	PING.EXE
4280	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
452	PING.EXE
3740	PING.EXE
4280	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 376 wrote to memory of 4360	376	2026-10-26_e1859dcb03f8b09b0ac5b65337b5c037_elex_wannacry.exe	84
PID 4360 wrote to memory of 3796	4360	WINWORD.exe	85
PID 3796 wrote to memory of 452	3796	cmd.exe	87
PID 3796 wrote to memory of 3740	3796	cmd.exe	88
PID 3796 wrote to memory of 4280	3796	cmd.exe	91
PID 3796 wrote to memory of 4256	3796	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-10-26_e1859dcb03f8b09b0ac5b65337b5c037_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-26_e1859dcb03f8b09b0ac5b65337b5c037_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:376
- 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:4360
- - 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\000057BE" 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:3796
  - - 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:452
  - - 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:3740
  - - 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:4280
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:4256

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000057BE

Path C:\Users\Admin\AppData\Roaming\Mozilla\000057BE
Size 88KB
SHA256 50b8c9bd52f37684b890a850a181afdeb2bf6e3c8d390b972f52cb8d86d6ac5a
MD5 aa32cf9810e2cd644a4e8a5fd42e729f
SHA1 eed60f03f6e18068b4f5ad7722fb4fc37eb559a3
SHA512 e0922c31182df197928dd1d16217203318fe44580a1f41a7ab50f3a280146ba3af20f434c745b04984bd09b7c2a39ba6be0083ec11fb36344f0b2e766c07df70
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrG:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193+
TLSH
T11D934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 4362e1f68f3edddf7e7f6825057499ce81f5abd5fdd682b31c02bbb3f0aa10e1
MD5 e1859dcb03f8b09b0ac5b65337b5c037
SHA1 04f347a8e56429bc31e655c2f631c86fcab9eb86
SHA512 461d18aaff497fbe4e3b51b86d74aab847b478fe2ceee535ab0f62c5076fd7f17efacb599262872c8545d496b916fb04c4d01a4f5de4466d5699466f7662d6f8
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrW:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193e
TLSH
T184934B8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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