juko | bd4526677012b5a305860cb6dab0f266de3fb0a13380d74dd1c1cc64bd3d78ee

General

Target
2026-08-03_817338bf3bb198fd82efc8ebfd296af8_elex_wannacry.exe
Size 57KB
Sample260803-k26gxafk21
SHA256 bd4526677012b5a305860cb6dab0f266de3fb0a13380d74dd1c1cc64bd3d78ee
MD5 817338bf3bb198fd82efc8ebfd296af8
SHA1 31b41ab5fe64a49ecf3206e89e0abc15d68f5f9b
SHA512 e0dec66c5c3a476ed941810bc86ea28fb5288dda75a0714f08b580d1bbc64a049f329c3dbbdc6f7a1ec8f870f4ab06948580aecee67620293b01911a55e0b0a5
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9DmqaD:wLy2Kerc64CiGImEsoDfaD
TLSH
T132433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
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 7 IoCs

resource	yara_rule
behavioral2/memory/5908-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x000d000000019cc9-5.dat	family_juko
behavioral2/memory/5908-9-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/1668-12-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c586-13.dat	family_juko
behavioral2/memory/1856-15-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/1856-16-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1668	WINWORD.exe
1856	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-1-5-21-1738198120-2966725515-3980530802-1000\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
4068	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	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	2026-08-03_817338bf3bb198fd82efc8ebfd296af8_elex_wannacry.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
1384	PING.EXE
2992	PING.EXE
4068	cmd.exe
6108	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6108	PING.EXE
1384	PING.EXE
2992	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5908 wrote to memory of 1668	5908	2026-08-03_817338bf3bb198fd82efc8ebfd296af8_elex_wannacry.exe	89
PID 1668 wrote to memory of 4068	1668	WINWORD.exe	90
PID 4068 wrote to memory of 6108	4068	cmd.exe	92
PID 4068 wrote to memory of 1384	4068	cmd.exe	93
PID 4068 wrote to memory of 2992	4068	cmd.exe	94
PID 4068 wrote to memory of 1856	4068	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-03_817338bf3bb198fd82efc8ebfd296af8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_817338bf3bb198fd82efc8ebfd296af8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5908
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1668
- - 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\00002E51" 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:4068
  - - 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:6108
  - - 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:1384
  - - 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:2992
  - - 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:1856

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

00002E51

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002E51
Size 57KB
SHA256 965dec72a2e04477441942d3a337a6a2388b2be41761e254914bd116db7b6b34
MD5 6915279e4475a038ad499fc3b33bbce4
SHA1 caed1657215689a89b2eae27586bcfe4a9daa22e
SHA512 e05389f118484747b3c898a521d64a5651bde45db49e5b221be4e94bdc1cc4914afafbf5ad3b71a867521ec0c5bf7e1f5ec09c7d269e881d5687abf54877e241
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqao:wLy2Kerc64CiGImEsoDfao
TLSH
T1BC433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 bd4526677012b5a305860cb6dab0f266de3fb0a13380d74dd1c1cc64bd3d78ee
MD5 817338bf3bb198fd82efc8ebfd296af8
SHA1 31b41ab5fe64a49ecf3206e89e0abc15d68f5f9b
SHA512 e0dec66c5c3a476ed941810bc86ea28fb5288dda75a0714f08b580d1bbc64a049f329c3dbbdc6f7a1ec8f870f4ab06948580aecee67620293b01911a55e0b0a5
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9DmqaD:wLy2Kerc64CiGImEsoDfaD
TLSH
T132433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1668-12-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/1856-15-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/1856-16-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5908-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5908-9-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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