juko | 6ab0fa611a38c59f8b148fbd56a974f23aa3a8904d719c6a58bf59809d803f23

General

Target
2026-04-15_c6582e9d6f48de47d96784ecb0ffd329_elex_wannacry.exe
Size 57KB
Sample260416-aptmgacy8p
SHA256 6ab0fa611a38c59f8b148fbd56a974f23aa3a8904d719c6a58bf59809d803f23
MD5 c6582e9d6f48de47d96784ecb0ffd329
SHA1 82600e74139adafc6ab0e585c2d5da241427cead
SHA512 3b5d991fbf2024b01b0328fc16129e0bbf20fbf0d1bf54008df62057b9af823838ed0179bc1cbf8ac9e16c58ced0b1b08a25ca8a5e7f42180bfb1bd53a840548
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQV:qLy2Kerc64CiGImklNUyp8Tq
TLSH
T13F433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
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/4896-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x000a00000002166e-5.dat	family_juko
behavioral1/memory/4896-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/4836-14-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x0003000000023140-15.dat	family_juko
behavioral1/memory/3356-17-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/3356-18-0x0000000000400000-0x0000000000422000-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-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	2026-04-15_c6582e9d6f48de47d96784ecb0ffd329_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4836	WINWORD.exe
3356	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-1-5-21-914486190-3969805341-592249730-1000\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	2026-04-15_c6582e9d6f48de47d96784ecb0ffd329_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
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

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
4004	PING.EXE
4660	PING.EXE
3192	PING.EXE
5104	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4004	PING.EXE
4660	PING.EXE
3192	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4896 wrote to memory of 4836	4896	2026-04-15_c6582e9d6f48de47d96784ecb0ffd329_elex_wannacry.exe	85
PID 4836 wrote to memory of 5104	4836	WINWORD.exe	86
PID 5104 wrote to memory of 4004	5104	cmd.exe	88
PID 5104 wrote to memory of 4660	5104	cmd.exe	89
PID 5104 wrote to memory of 3192	5104	cmd.exe	91
PID 5104 wrote to memory of 3356	5104	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-04-15_c6582e9d6f48de47d96784ecb0ffd329_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-15_c6582e9d6f48de47d96784ecb0ffd329_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4896
- 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:4836
- - 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\00003EFD" 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:5104
  - - 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:4004
  - - 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:4660
  - - 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:3192
  - - 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:3356

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

00003EFD

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003EFD
Size 57KB
SHA256 58ecf47fe1842ed749e7e966f9fda84f39de34b6f61d64d80bb9e5b2a569f1d0
MD5 3ecc263db4d20e541d56ff618f6aafbb
SHA1 b3b31f0b9ac07bbb4f48e5d55d136c5d6bced844
SHA512 70328a5bbebc2482b57c6bfd43a4605afc26bec95a482c36cd8ff84c499c79d8025962fa3a9bdd8c7bd7c6cca4825a78cc154586ffdb60445f6d400db7f4acdc
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQ0:qLy2Kerc64CiGImklNUyp8Tf
TLSH
T137433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 6ab0fa611a38c59f8b148fbd56a974f23aa3a8904d719c6a58bf59809d803f23
MD5 c6582e9d6f48de47d96784ecb0ffd329
SHA1 82600e74139adafc6ab0e585c2d5da241427cead
SHA512 3b5d991fbf2024b01b0328fc16129e0bbf20fbf0d1bf54008df62057b9af823838ed0179bc1cbf8ac9e16c58ced0b1b08a25ca8a5e7f42180bfb1bd53a840548
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQV:qLy2Kerc64CiGImklNUyp8Tq
TLSH
T13F433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3356-17-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3356-18-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4836-14-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4896-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4896-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads