juko | 9399daf23f4cacf40bf3aaec37f91050b3edccee9f592a346231cbea3d1d79df

General

Target
2026-05-10_d97f92b4eea5354622addb535f69a0e2_elex_wannacry.exe
Size 39KB
Sample260510-kqtc7se19k
SHA256 9399daf23f4cacf40bf3aaec37f91050b3edccee9f592a346231cbea3d1d79df
MD5 d97f92b4eea5354622addb535f69a0e2
SHA1 8b447b7b9684c4a7eb945c4451bedd59e4a6783e
SHA512 b9023e5c45f92ac24c84aa1d899f53b1ec4a301f16d68a56e2df7b4a75b6c478bd986c2b2be8385175cdf5cdd8283db18fc16dff7d8820b14d0b191ffe08b360
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBj:aLsF2Kerc64sTiX2IV0DVyIGFo
TLSH
T1CD036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/5108-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x002b00000002b142-5.dat	family_juko
behavioral2/memory/5108-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3708-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x002000000002b14f-15.dat	family_juko
behavioral2/memory/3356-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3356-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3708	WINWORD.exe
3356	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-1-5-21-1383858298-2057492509-1726743289-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-10_d97f92b4eea5354622addb535f69a0e2_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

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
4948	PING.EXE
3176	PING.EXE
3504	PING.EXE
2512	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4948	PING.EXE
3176	PING.EXE
3504	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5108 wrote to memory of 3708	5108	2026-05-10_d97f92b4eea5354622addb535f69a0e2_elex_wannacry.exe	80
PID 3708 wrote to memory of 2512	3708	WINWORD.exe	81
PID 2512 wrote to memory of 4948	2512	cmd.exe	83
PID 2512 wrote to memory of 3176	2512	cmd.exe	84
PID 2512 wrote to memory of 3504	2512	cmd.exe	85
PID 2512 wrote to memory of 3356	2512	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-10_d97f92b4eea5354622addb535f69a0e2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-10_d97f92b4eea5354622addb535f69a0e2_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5108
- 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:3708
- - 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\00002E66" 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:2512
  - - 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:4948
  - - 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:3176
  - - 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:3504
  - - 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:3356

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

00002E66

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002E66
Size 39KB
SHA256 e446cbaf5dae308a13bd34ca12678ced46a150ad826a825a19a23a7df2d09516
MD5 99aa4fa114bf7e073ed7e17033e2cb5e
SHA1 43469f2360f93d439f565060e5e39f1da893b53b
SHA512 cf3c76636c88e0034647c57ec56476e1812f44b912455744bf9c290337984c9b110852ee3e473026c6bfc014df8aaf79fe512b0139c78e93d2b325637b9c641d
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBS:aLsF2Kerc64sTiX2IV0DVyIGFt
TLSH
T18A036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 9399daf23f4cacf40bf3aaec37f91050b3edccee9f592a346231cbea3d1d79df
MD5 d97f92b4eea5354622addb535f69a0e2
SHA1 8b447b7b9684c4a7eb945c4451bedd59e4a6783e
SHA512 b9023e5c45f92ac24c84aa1d899f53b1ec4a301f16d68a56e2df7b4a75b6c478bd986c2b2be8385175cdf5cdd8283db18fc16dff7d8820b14d0b191ffe08b360
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBj:aLsF2Kerc64sTiX2IV0DVyIGFo
TLSH
T1CD036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3356-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3356-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3708-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5108-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5108-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads