juko | 34116fad3543b28d29d20e4105e372cf00def71a83d92b7c48e69dfe0f376f32

General

Target
2026-05-19_c04675f6702cad03e0cd44372801112f_elex_wannacry.exe
Size 49KB
Sample260519-rx1t7ae151
SHA256 34116fad3543b28d29d20e4105e372cf00def71a83d92b7c48e69dfe0f376f32
MD5 c04675f6702cad03e0cd44372801112f
SHA1 a155d58359891041ff6d862009c266fca32de964
SHA512 61ef82ca2171e1da6702566c463d100623274ff0351246d3b45d4ba1381747873d39d63e631afcb8361d649a4123b9a83b2b08baa4805baa39a9fc4d4ac7dbb0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2l:VLy2Kerc64CiGImVucp4kojWh2l
TLSH
T1ED334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA740765A1C72D6BCF30E9E
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
behavioral2/memory/4168-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001f00000002b275-5.dat	family_juko
behavioral2/memory/4168-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4128-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001c00000002b3ac-15.dat	family_juko
behavioral2/memory/2220-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2220-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4128	WINWORD.exe
2220	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-1-5-21-1636999435-3883760687-346127294-1000\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	2026-05-19_c04675f6702cad03e0cd44372801112f_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
2260	PING.EXE
4476	PING.EXE
3380	PING.EXE
4524	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2260	PING.EXE
4476	PING.EXE
3380	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4168 wrote to memory of 4128	4168	2026-05-19_c04675f6702cad03e0cd44372801112f_elex_wannacry.exe	80
PID 4128 wrote to memory of 4524	4128	WINWORD.exe	81
PID 4524 wrote to memory of 2260	4524	cmd.exe	83
PID 4524 wrote to memory of 4476	4524	cmd.exe	84
PID 4524 wrote to memory of 3380	4524	cmd.exe	85
PID 4524 wrote to memory of 2220	4524	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-19_c04675f6702cad03e0cd44372801112f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-19_c04675f6702cad03e0cd44372801112f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4168
- 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:4128
- - 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\000049BD" 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:4524
  - - 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:2260
  - - 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:4476
  - - 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:3380
  - - 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:2220

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

000049BD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000049BD
Size 49KB
SHA256 6f2f974a6515696550bea65e49c6ee169d94288894d1ab1f33afc91f9f5333e4
MD5 473fc0a482fe02fd86260133028e7b3a
SHA1 f6adb9c21332a51cb90d80bedffe4b936f3fccb8
SHA512 14dfb81c0a7c61a6dcdddeae9943c2d4ff28e94847202cf027b78855696f6ee2f7aaf576ae8e5c41eca7af018da65c546e9f8573333511998ab035b15c1f2ab2
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2I:VLy2Kerc64CiGImVucp4kojWh2I
TLSH
T1B3334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 34116fad3543b28d29d20e4105e372cf00def71a83d92b7c48e69dfe0f376f32
MD5 c04675f6702cad03e0cd44372801112f
SHA1 a155d58359891041ff6d862009c266fca32de964
SHA512 61ef82ca2171e1da6702566c463d100623274ff0351246d3b45d4ba1381747873d39d63e631afcb8361d649a4123b9a83b2b08baa4805baa39a9fc4d4ac7dbb0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2l:VLy2Kerc64CiGImVucp4kojWh2l
TLSH
T1ED334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2220-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2220-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4128-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4168-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4168-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads