juko | ecc3329dc9e4d3df919ffb829616c43035b5629b51d8f5d462d638381aab091c

General

Target
2026-04-24_9c9374c69bd29af188c22bc8c3720f9b_elex_wannacry.exe
Size 138KB
Sample260424-q643jacw2x
SHA256 ecc3329dc9e4d3df919ffb829616c43035b5629b51d8f5d462d638381aab091c
MD5 9c9374c69bd29af188c22bc8c3720f9b
SHA1 5bfb88a36882dcd84cd683c18b7ec28ba574cb5a
SHA512 578885d689653dec08d1a813723c8d32193399aeec1ea1e170bccb45a36031b2b927ff2cfca79fec2ae971aa1e1e61129076831b70620dcf29b0439939c9c472
SSDEEP 3072:sLy2Kerc64CiGIm8aRgqG91AJ0qVIdWkDnRqkXCMFJBrXWWestyFG7G:sLy2Kwc64YIZ+C2JisNM5XWWe0Ly
TLSH
T13FD33A1563FA461AE5FF06BCA930103F0576BF221917E59F394831FD0B79781CAA23A6
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/4156-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/files/0x0010000000024189-5.dat	family_juko
behavioral1/memory/4156-12-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/memory/4124-14-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/files/0x0009000000024463-15.dat	family_juko
behavioral1/memory/716-17-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/memory/716-18-0x0000000000400000-0x0000000000436000-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-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	2026-04-24_9c9374c69bd29af188c22bc8c3720f9b_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4124	WINWORD.exe
716	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-1-5-21-312252282-3884318443-358092420-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-24_9c9374c69bd29af188c22bc8c3720f9b_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

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
1428	cmd.exe
2556	PING.EXE
3268	PING.EXE
3520	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2556	PING.EXE
3268	PING.EXE
3520	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4156 wrote to memory of 4124	4156	2026-04-24_9c9374c69bd29af188c22bc8c3720f9b_elex_wannacry.exe	84
PID 4124 wrote to memory of 1428	4124	WINWORD.exe	85
PID 1428 wrote to memory of 2556	1428	cmd.exe	87
PID 1428 wrote to memory of 3268	1428	cmd.exe	88
PID 1428 wrote to memory of 3520	1428	cmd.exe	89
PID 1428 wrote to memory of 716	1428	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-04-24_9c9374c69bd29af188c22bc8c3720f9b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-24_9c9374c69bd29af188c22bc8c3720f9b_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4156
- 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:4124
- - 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\0000776D" 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:1428
  - - 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:2556
  - - 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:3268
  - - 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:3520
  - - 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:716

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

0000776D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000776D
Size 138KB
SHA256 7e131e11fe56821fd22b75117a3deade8f11d012c2dbed94e11b4576ff77a22b
MD5 5f05b8e0094dc65f815398cce605058c
SHA1 e47a705f20a83f16b6f0c92b58a3ccd9047a8030
SHA512 96a6ebf530fdc9886de9991b1c14373d3d82e588da09af30218b714b08f7cc04c68170ff4041d5dcc1e2f55cae7e152cc1126d00d97f3b55bd566854e803a424
SSDEEP 3072:sLy2Kerc64CiGIm8aRgqG91AJ0qVIdWkDnRqkXCMFJBrXWWestyFG7h:sLy2Kwc64YIZ+C2JisNM5XWWe0L1
TLSH
T1D3D33A1563FA461AE5FF06BCA930103F0576BF221917E59F394831FD0B79781CAA23A6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 138KB
SHA256 ecc3329dc9e4d3df919ffb829616c43035b5629b51d8f5d462d638381aab091c
MD5 9c9374c69bd29af188c22bc8c3720f9b
SHA1 5bfb88a36882dcd84cd683c18b7ec28ba574cb5a
SHA512 578885d689653dec08d1a813723c8d32193399aeec1ea1e170bccb45a36031b2b927ff2cfca79fec2ae971aa1e1e61129076831b70620dcf29b0439939c9c472
SSDEEP 3072:sLy2Kerc64CiGIm8aRgqG91AJ0qVIdWkDnRqkXCMFJBrXWWestyFG7G:sLy2Kwc64YIZ+C2JisNM5XWWe0Ly
TLSH
T13FD33A1563FA461AE5FF06BCA930103F0576BF221917E59F394831FD0B79781CAA23A6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/716-17-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/716-18-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4124-14-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4156-0-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4156-12-0x0000000000400000-0x0000000000436000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads