juko | 7ac8512f23d0a6ba6557ec2fcd01b27fedb1cd5003dfd000ad207397d361e7a7

General

Target
2026-09-04_7b3954a89235d740369ff42a66b1c9e0_elex_wannacry.exe
Size 88KB
Sample260905-gp615afl6z
SHA256 7ac8512f23d0a6ba6557ec2fcd01b27fedb1cd5003dfd000ad207397d361e7a7
MD5 7b3954a89235d740369ff42a66b1c9e0
SHA1 b2f9f80545160e10c9e6d5c8971ddcdcdef23578
SHA512 5ac61dfca9a6fa5b16b4fb8defd3e70b75d9495e4a57efcce45316654ad96c9ee8965a3068f7a9f363b68ab6cc3c0119f16ff8c92ed260834f089310b3511147
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs+:zLy2Kerc64CiGImHc/28wzCBlycJWeeJ
TLSH
T1F9933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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 8 IoCs

resource	yara_rule
behavioral2/memory/800-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000900000001b85f-5.dat	family_juko
behavioral2/memory/800-11-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/4284-10-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/4284-13-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c45b-14.dat	family_juko
behavioral2/memory/3556-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/3556-17-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4284	WINWORD.exe
3556	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-1-5-21-3797332335-34111092-3597280141-1000\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
3352	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-04_7b3954a89235d740369ff42a66b1c9e0_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
5432	PING.EXE
3352	cmd.exe
1120	PING.EXE
2324	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1120	PING.EXE
2324	PING.EXE
5432	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 800 wrote to memory of 4284	800	2026-09-04_7b3954a89235d740369ff42a66b1c9e0_elex_wannacry.exe	89
PID 4284 wrote to memory of 3352	4284	WINWORD.exe	90
PID 3352 wrote to memory of 1120	3352	cmd.exe	92
PID 3352 wrote to memory of 2324	3352	cmd.exe	93
PID 3352 wrote to memory of 5432	3352	cmd.exe	94
PID 3352 wrote to memory of 3556	3352	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-09-04_7b3954a89235d740369ff42a66b1c9e0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-04_7b3954a89235d740369ff42a66b1c9e0_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:800
- 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:4284
- - 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\00004038" 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:3352
  - - 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:1120
  - - 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:2324
  - - 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:5432
  - - 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:3556

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

00004038

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004038
Size 88KB
SHA256 57731d95bdaf0c9cee85f50f450175263cda992b6400e2ee9c29d3d392e31a23
MD5 92cb3cf3f262befb983cf2b0ab09477b
SHA1 c4379e719a64944343d9d0c2c77e371cd6d8fb20
SHA512 2c1074d8257c8875a9a0cbdf5ad922828da937488723522d70e2b9ba01fd8aacd64793987b7d274135215ce4afbf485bd4239faefb365982c2a127f8395517dd
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs3:zLy2Kerc64CiGImHc/28wzCBlycJWees
TLSH
T111933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 7ac8512f23d0a6ba6557ec2fcd01b27fedb1cd5003dfd000ad207397d361e7a7
MD5 7b3954a89235d740369ff42a66b1c9e0
SHA1 b2f9f80545160e10c9e6d5c8971ddcdcdef23578
SHA512 5ac61dfca9a6fa5b16b4fb8defd3e70b75d9495e4a57efcce45316654ad96c9ee8965a3068f7a9f363b68ab6cc3c0119f16ff8c92ed260834f089310b3511147
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs+:zLy2Kerc64CiGImHc/28wzCBlycJWeeJ
TLSH
T1F9933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/800-0-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/800-11-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/3556-16-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/3556-17-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4284-10-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4284-13-0x0000000000400000-0x000000000042A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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