juko | 5670ac768c533361d0abacfed1f8b85470200b398e3570a795136e6ac895df3b

Analysis

max time kernel
149s
max time network
147s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
02/05/2026, 12:17

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General

Target
2026-05-02_b12fbf17cb29ccca41f0da52d3d40119_elex_wannacry.exe
Size 88KB
Sample260502-pgcfjse12x
SHA256 5670ac768c533361d0abacfed1f8b85470200b398e3570a795136e6ac895df3b
MD5 b12fbf17cb29ccca41f0da52d3d40119
SHA1 31aacbe9b42b501f6cdb2ccaf09e731c506065a8
SHA512 22c1500b76bdda1ae3c8f5766e4a574d7d7259e8173fab2a086cde7fe105bbd3b98c24ff9ef6369f4c1d657c3a6f6e278d1b1af66eb004177f9e5947a8ebd709
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs4:zLy2Kerc64CiGImHc/28wzCBlycJWeeP
TLSH
T1C2933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/1832-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x0017000000025a2d-5.dat	family_juko
behavioral2/memory/1832-13-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/2324-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b2f8-17.dat	family_juko
behavioral2/memory/4776-19-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/4776-28-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2324	WINWORD.exe
4776	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-1-5-21-3847269522-1618051987-1942096715-1000\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	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	2026-05-02_b12fbf17cb29ccca41f0da52d3d40119_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
5052	PING.EXE
2296	PING.EXE
3444	cmd.exe
2156	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2156	PING.EXE
5052	PING.EXE
2296	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1832 wrote to memory of 2324	1832	2026-05-02_b12fbf17cb29ccca41f0da52d3d40119_elex_wannacry.exe	80
PID 2324 wrote to memory of 3444	2324	WINWORD.exe	81
PID 3444 wrote to memory of 2156	3444	cmd.exe	83
PID 3444 wrote to memory of 5052	3444	cmd.exe	84
PID 3444 wrote to memory of 2296	3444	cmd.exe	85
PID 3444 wrote to memory of 4776	3444	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-02_b12fbf17cb29ccca41f0da52d3d40119_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-02_b12fbf17cb29ccca41f0da52d3d40119_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1832
- 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:2324
- - 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\00005FAB" 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:3444
  - - 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:2156
  - - 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:\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:2296
  - - 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:4776

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00005FAB

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005FAB
Size 88KB
SHA256 20882fee43b076b8713ebf190fa9c013abb0055cfc1f8ebdefa9fdd6da4fe3ce
MD5 f2680a42adf6ceaab63964a81007a0ee
SHA1 b68c34b419092dd62b9073fa772d772504ef2b3f
SHA512 14f7a18d35ad6bbb8882ebd5ab0fedb7f7cd175441182a0aba21911f207c33035acca546667e132c0a92dd9137593d78ea14e3b00d3b1d79f8f0c80f02b05cad
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsU:zLy2Kerc64CiGImHc/28wzCBlycJWee/
TLSH
T12D933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 5670ac768c533361d0abacfed1f8b85470200b398e3570a795136e6ac895df3b
MD5 b12fbf17cb29ccca41f0da52d3d40119
SHA1 31aacbe9b42b501f6cdb2ccaf09e731c506065a8
SHA512 22c1500b76bdda1ae3c8f5766e4a574d7d7259e8173fab2a086cde7fe105bbd3b98c24ff9ef6369f4c1d657c3a6f6e278d1b1af66eb004177f9e5947a8ebd709
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs4:zLy2Kerc64CiGImHc/28wzCBlycJWeeP
TLSH
T1C2933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1832-0-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/1832-12-0x0000000000650000-0x00000000006CA000-memory.dmp

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memory/1832-13-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/2324-15-0x0000000000690000-0x000000000070A000-memory.dmp

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memory/2324-16-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4776-19-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4776-20-0x00000000005C0000-0x000000000063A000-memory.dmp

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memory/4776-28-0x0000000000400000-0x000000000042A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads