juko | b3cb62274d15406ad0d222913b9870c012079d779232ca6cb53a472b4e1e424d

General

Target
2026-04-26_7b08c1f36b8b037fd66303da576a219a_elex_wannacry.exe
Size 94KB
Sample260426-t2fe6abt21
SHA256 b3cb62274d15406ad0d222913b9870c012079d779232ca6cb53a472b4e1e424d
MD5 7b08c1f36b8b037fd66303da576a219a
SHA1 1e6000794e7bbc86aafbf6889e307127ad59e31f
SHA512 f60465e4ef2e08148edbd93233df01b52d52ed2d8f7c965316cd47c2aeeaf63cf1de5150400fe8d15bfb7eb741b15a24d55d8e1b15a40a24a4450950eda94a9b
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Ni:RLy2Kerc64CiGImFYgUBWTb4/Ni
TLSH
T1F9937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/1796-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x009900000001b598-6.dat	family_juko
behavioral1/memory/1796-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/4068-14-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x0008000000024341-15.dat	family_juko
behavioral1/memory/4960-17-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/4960-19-0x0000000000400000-0x000000000042B000-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-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	2026-04-26_7b08c1f36b8b037fd66303da576a219a_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4068	WINWORD.exe
4960	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-1-5-21-2714754311-527593155-1440850301-1000\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	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	2026-04-26_7b08c1f36b8b037fd66303da576a219a_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
3532	cmd.exe
4532	PING.EXE
1604	PING.EXE
3240	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4532	PING.EXE
1604	PING.EXE
3240	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1796 wrote to memory of 4068	1796	2026-04-26_7b08c1f36b8b037fd66303da576a219a_elex_wannacry.exe	84
PID 4068 wrote to memory of 3532	4068	WINWORD.exe	85
PID 3532 wrote to memory of 4532	3532	cmd.exe	87
PID 3532 wrote to memory of 1604	3532	cmd.exe	88
PID 3532 wrote to memory of 3240	3532	cmd.exe	89
PID 3532 wrote to memory of 4960	3532	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-04-26_7b08c1f36b8b037fd66303da576a219a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-26_7b08c1f36b8b037fd66303da576a219a_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1796
- 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:4068
- - 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\00006D94" 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:3532
  - - 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:4532
  - - 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:1604
  - - 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:3240
  - - 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:4960

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

00006D94

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006D94
Size 94KB
SHA256 b8df24750bfe80d679b0f76344680a0611ceabd5b6cf3307b332886cca610379
MD5 0d706958844b93353c0078220755e07d
SHA1 2a74eb6caef53ec20f8121f26ac2a568c9c9b285
SHA512 a11084c6a8e5b2aec0ab714967b210c3e5f1a7e0d81040eef3781a40fe530215e4512730401403a27ef7101a251eda846da969c58e31bf7f1275c2eba8380068
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/N4:RLy2Kerc64CiGImFYgUBWTb4/N4
TLSH
T13E937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 b3cb62274d15406ad0d222913b9870c012079d779232ca6cb53a472b4e1e424d
MD5 7b08c1f36b8b037fd66303da576a219a
SHA1 1e6000794e7bbc86aafbf6889e307127ad59e31f
SHA512 f60465e4ef2e08148edbd93233df01b52d52ed2d8f7c965316cd47c2aeeaf63cf1de5150400fe8d15bfb7eb741b15a24d55d8e1b15a40a24a4450950eda94a9b
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Ni:RLy2Kerc64CiGImFYgUBWTb4/Ni
TLSH
T1F9937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1796-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1796-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4068-14-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4960-17-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4960-18-0x0000000002D10000-0x0000000002D29000-memory.dmp

Download

memory/4960-19-0x0000000000400000-0x000000000042B000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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