juko | e757eae7d1486c3c702d569d356a2a27f0928a0de43678df269c1087dd4332ec

General

Target
2026-05-10_a173fa45409324ae5f660bf36d5e94fb_elex_wannacry.exe
Size 30KB
Sample260510-nc9ptaev6t
SHA256 e757eae7d1486c3c702d569d356a2a27f0928a0de43678df269c1087dd4332ec
MD5 a173fa45409324ae5f660bf36d5e94fb
SHA1 2895ecc7ed1451abcd21bdf467851443a7db1297
SHA512 0a0fa8f84e4311f7801e44322511ddb9e5d72c1bb61bd319474c4fccbbfec966db60b83278ede845e0323a9bbd037083d0630d8162f2c01cc239e4d8ba8056b0
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX5:tLsF2Kerc64sTiX2IV0Dzlo5
TLSH
T13CE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x001f00000002b0b6-4.dat	family_juko
behavioral2/files/0x001b00000002b3b0-11.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1784	WINWORD.exe
4872	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-1-5-21-3119821332-640943685-2562343641-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-10_a173fa45409324ae5f660bf36d5e94fb_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

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
1096	cmd.exe
3116	PING.EXE
2112	PING.EXE
3288	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3116	PING.EXE
2112	PING.EXE
3288	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1920 wrote to memory of 1784	1920	2026-05-10_a173fa45409324ae5f660bf36d5e94fb_elex_wannacry.exe	79
PID 1784 wrote to memory of 1096	1784	WINWORD.exe	80
PID 1096 wrote to memory of 3116	1096	cmd.exe	82
PID 1096 wrote to memory of 2112	1096	cmd.exe	83
PID 1096 wrote to memory of 3288	1096	cmd.exe	84
PID 1096 wrote to memory of 4872	1096	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-10_a173fa45409324ae5f660bf36d5e94fb_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-10_a173fa45409324ae5f660bf36d5e94fb_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1920
- 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:1784
- - 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\0000013D" 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:1096
  - - 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:3116
  - - 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:2112
  - - 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:3288
  - - 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:4872

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

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

0000013D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000013D
Size 30KB
SHA256 5482d8b9b2f6de01b3bdfb3775d40cd4971dfb407ad64425f0df9a9ff85a2517
MD5 868da981ff77cae94ba828ab75ca8a9d
SHA1 6ab43c4672f15db7000129e73a9a69b5d50e3e1f
SHA512 fb5cb098c35947e1e789289b0c05bb222eff99b0d9f69c7ada2c70bb8f5966d0ae52e80af6db155ccad50b2b98e071481dc6264bb86d44f321442a1d84d18668
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXh:tLsF2Kerc64sTiX2IV0Dzloh
TLSH
T106E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 e757eae7d1486c3c702d569d356a2a27f0928a0de43678df269c1087dd4332ec
MD5 a173fa45409324ae5f660bf36d5e94fb
SHA1 2895ecc7ed1451abcd21bdf467851443a7db1297
SHA512 0a0fa8f84e4311f7801e44322511ddb9e5d72c1bb61bd319474c4fccbbfec966db60b83278ede845e0323a9bbd037083d0630d8162f2c01cc239e4d8ba8056b0
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX5:tLsF2Kerc64sTiX2IV0Dzlo5
TLSH
T13CE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1784-10-0x00000000005F0000-0x00000000005F6000-memory.dmp

Download

memory/1920-7-0x0000000000970000-0x0000000000976000-memory.dmp

Download

memory/4872-13-0x0000000000630000-0x0000000000636000-memory.dmp

Download

memory/4872-14-0x0000000002B40000-0x0000000002B47000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads