juko | 8106bcfbe36ef179bdffa34c5e0e3693d72a8290a92b0d1c14b87da644936f31

General

Target
2026-08-08_2b698910726054ce5c0edae85a8da763_elex_wannacry.exe
Size 49KB
Sample260808-kxtmjscm91
SHA256 8106bcfbe36ef179bdffa34c5e0e3693d72a8290a92b0d1c14b87da644936f31
MD5 2b698910726054ce5c0edae85a8da763
SHA1 84f25fa6732ad6d9aa0fef08e99441cb6464d0f1
SHA512 a27df889f8973b5b5f7fe640c1766b8dab7fe78dd17d322cd36c3083dff71184bf7f32e1215474bc8fe7d94512af0b8ca6961970f44b4702df442d9714a01ee7
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2e:4Ly2Kerc64CiGImVu8p4kojWh2e
TLSH
T1AB334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/4416-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001000000001b1d0-5.dat	family_juko
behavioral2/memory/4416-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4072-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001600000001c4a0-13.dat	family_juko
behavioral2/memory/4092-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4092-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4072	WINWORD.exe
4092	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
2672	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	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	2026-08-08_2b698910726054ce5c0edae85a8da763_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
2672	cmd.exe
932	PING.EXE
4220	PING.EXE
560	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
932	PING.EXE
4220	PING.EXE
560	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4416 wrote to memory of 4072	4416	2026-08-08_2b698910726054ce5c0edae85a8da763_elex_wannacry.exe	89
PID 4072 wrote to memory of 2672	4072	WINWORD.exe	90
PID 2672 wrote to memory of 932	2672	cmd.exe	92
PID 2672 wrote to memory of 4220	2672	cmd.exe	93
PID 2672 wrote to memory of 560	2672	cmd.exe	94
PID 2672 wrote to memory of 4092	2672	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-08_2b698910726054ce5c0edae85a8da763_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_2b698910726054ce5c0edae85a8da763_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4416
- 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:4072
- - 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\00005E32" 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:2672
  - - 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:932
  - - 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:4220
  - - 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:560
  - - 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:4092

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

00005E32

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005E32
Size 49KB
SHA256 dfe01659bd13ff8fcac0f06db58ffa3ec3b12b3086fd31b2bd672736ee29ca65
MD5 6b4096562c11db2e79297f8f1c45e8bf
SHA1 78cfbb0a1c5939146492848059ce381847d1c31c
SHA512 e94f5d01aa64e33880faf83fecb88af67616adec77ef4a970765bfa723e1890db5b3959d45834c38d326c4c6fd70ea2ab322c46930defb3bedca359c95116bf3
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2o:4Ly2Kerc64CiGImVu8p4kojWh2o
TLSH
T1BE334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 8106bcfbe36ef179bdffa34c5e0e3693d72a8290a92b0d1c14b87da644936f31
MD5 2b698910726054ce5c0edae85a8da763
SHA1 84f25fa6732ad6d9aa0fef08e99441cb6464d0f1
SHA512 a27df889f8973b5b5f7fe640c1766b8dab7fe78dd17d322cd36c3083dff71184bf7f32e1215474bc8fe7d94512af0b8ca6961970f44b4702df442d9714a01ee7
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2e:4Ly2Kerc64CiGImVu8p4kojWh2e
TLSH
T1AB334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4072-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4092-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4092-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4416-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4416-10-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads