juko | 9b3c9de6b966ec425bf10cbc95d226a2dd79279d37755a1dc448525570a6d96c

General

Target
2026-09-01_27fa9ba1c75f1d92ed87d515daa84947_elex_wannacry.exe
Size 61KB
Sample260901-y63hpsef47
SHA256 9b3c9de6b966ec425bf10cbc95d226a2dd79279d37755a1dc448525570a6d96c
MD5 27fa9ba1c75f1d92ed87d515daa84947
SHA1 2eeb9d08ba6edf9c58c4c99d51166ea40607fb74
SHA512 89edd8931d27af9db26e0d2052d7644fdc60398a9c21fc84432923768e3e20b4ec0b99e11eebad94c3c9638ab7b72b44ad3c33ef20e281446d259df7665d84cf
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQZ:yLy2Kerc64CiGImVZuyp8Tu
TLSH
T110532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
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/4792-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000c00000001b1a4-5.dat	family_juko
behavioral2/memory/4792-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/1880-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5b7-13.dat	family_juko
behavioral2/memory/260-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/260-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1880	WINWORD.exe
260	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-1-5-21-1079202589-886135813-2527035092-1000\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
4992	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-01_27fa9ba1c75f1d92ed87d515daa84947_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

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
3312	PING.EXE
2340	PING.EXE
4992	cmd.exe
3984	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3984	PING.EXE
3312	PING.EXE
2340	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4792 wrote to memory of 1880	4792	2026-09-01_27fa9ba1c75f1d92ed87d515daa84947_elex_wannacry.exe	89
PID 1880 wrote to memory of 4992	1880	WINWORD.exe	90
PID 4992 wrote to memory of 3984	4992	cmd.exe	92
PID 4992 wrote to memory of 3312	4992	cmd.exe	93
PID 4992 wrote to memory of 2340	4992	cmd.exe	94
PID 4992 wrote to memory of 260	4992	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-09-01_27fa9ba1c75f1d92ed87d515daa84947_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-01_27fa9ba1c75f1d92ed87d515daa84947_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4792
- 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:1880
- - 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\00003E30" 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:4992
  - - 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:3984
  - - 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:3312
  - - 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:2340
  - - 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:260

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

00003E30

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003E30
Size 61KB
SHA256 29c1a8ae43428acc3e2b673a2529fc07b3f26a61d068cf86222346443bb493f3
MD5 439833056e5a5a496bb9b1a68be8cf00
SHA1 860d7d6b26a3c3215c883d0dc7777f03641d2f16
SHA512 ad832eaae4a33e236e475ee23c70e215b6391dbc9183eef5f8d0a0831c1625c1c5e63838bf80903cb42192a9c0d824a3da51c3c1736c7c95faebef65464e4720
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQz:yLy2Kerc64CiGImVZuyp8TA
TLSH
T186532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 61KB
SHA256 9b3c9de6b966ec425bf10cbc95d226a2dd79279d37755a1dc448525570a6d96c
MD5 27fa9ba1c75f1d92ed87d515daa84947
SHA1 2eeb9d08ba6edf9c58c4c99d51166ea40607fb74
SHA512 89edd8931d27af9db26e0d2052d7644fdc60398a9c21fc84432923768e3e20b4ec0b99e11eebad94c3c9638ab7b72b44ad3c33ef20e281446d259df7665d84cf
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQZ:yLy2Kerc64CiGImVZuyp8Tu
TLSH
T110532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/260-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/260-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/1880-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4792-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4792-10-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads