juko | 11fb4419fd8a10cbe73add40662648b5776167f50033d6442fcd4901595e525b

General

Target
2026-08-10_64e4a5993085325ea507b7008231fccb_elex_wannacry.exe
Size 49KB
Sample260810-pas5qagq6v
SHA256 11fb4419fd8a10cbe73add40662648b5776167f50033d6442fcd4901595e525b
MD5 64e4a5993085325ea507b7008231fccb
SHA1 1e9699fbf1dd711079fd05a1e53369b7580e9c26
SHA512 0a4561a77d4a7a391c51ed1585b740afe68a5af64bab2d3ca26c207d7a8fc9eb2807842d56095e3d834337bd835dfacefbd61520126ea1ba5afcdefbce93a88e
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h25:VLy2Kerc64CiGImVucp4kojWh25
TLSH
T1F0334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/0x000a000000016cd6-5.dat	family_juko
behavioral2/memory/4416-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3184-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c50e-13.dat	family_juko
behavioral2/memory/2944-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2944-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3184	WINWORD.exe
2944	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-1-5-21-3989226554-2204910950-1522900112-1000\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
1204	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-10_64e4a5993085325ea507b7008231fccb_elex_wannacry.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
1204	cmd.exe
4580	PING.EXE
5024	PING.EXE
5052	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5024	PING.EXE
5052	PING.EXE
4580	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4416 wrote to memory of 3184	4416	2026-08-10_64e4a5993085325ea507b7008231fccb_elex_wannacry.exe	89
PID 3184 wrote to memory of 1204	3184	WINWORD.exe	90
PID 1204 wrote to memory of 4580	1204	cmd.exe	92
PID 1204 wrote to memory of 5024	1204	cmd.exe	93
PID 1204 wrote to memory of 5052	1204	cmd.exe	94
PID 1204 wrote to memory of 2944	1204	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-10_64e4a5993085325ea507b7008231fccb_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_64e4a5993085325ea507b7008231fccb_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:3184
- - 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\00006601" 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:1204
  - - 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:4580
  - - 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:5024
  - - 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:5052
  - - 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:2944

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

00006601

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006601
Size 49KB
SHA256 5d7111b200b212056296a56eeafa003dc0baed1bb55c43be63f30fba3aa28a01
MD5 fa4e7c4a0a50f9c8222c369ca5a9f636
SHA1 5bc7327569bb873099b96e716ec63b219ad6a473
SHA512 0848f1e1f223254500540b71794da663475072ba06321c35767de967382a30a0fda8c2f251df8b51d019f4de854076d609053bbe432e867a5569e41410067a04
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2C:VLy2Kerc64CiGImVucp4kojWh2C
TLSH
T1BC334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 11fb4419fd8a10cbe73add40662648b5776167f50033d6442fcd4901595e525b
MD5 64e4a5993085325ea507b7008231fccb
SHA1 1e9699fbf1dd711079fd05a1e53369b7580e9c26
SHA512 0a4561a77d4a7a391c51ed1585b740afe68a5af64bab2d3ca26c207d7a8fc9eb2807842d56095e3d834337bd835dfacefbd61520126ea1ba5afcdefbce93a88e
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h25:VLy2Kerc64CiGImVucp4kojWh25
TLSH
T1F0334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2944-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2944-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3184-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

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

Download

memory/4416-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads