juko | 204ed37df771cc51cca3323dd5c7fea3cf641d5dbbe55b19055298930f10fd46

General

Target
2026-08-08_772e33ff8889b088fcd9dbad69ef639a_elex_wannacry.exe
Size 64KB
Sample260808-mxd8zavglb
SHA256 204ed37df771cc51cca3323dd5c7fea3cf641d5dbbe55b19055298930f10fd46
MD5 772e33ff8889b088fcd9dbad69ef639a
SHA1 fc73ebc31dbf4bb2f83483529196e0be9a644545
SHA512 4db0bf85efee80b39ac80f0695f77822a081da7ed41893ac8af83d3b4e44615ef0414e7e0e13f314c9199cc4f684f9bbe76b94bfcf0576eb37b1b57706d76f70
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uy:sLy2Kerc64CiGIm8so28y
TLSH
T1CC535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x00080000000187d5-3.dat	family_juko
behavioral2/files/0x001300000001c43e-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5656	WINWORD.exe
4792	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-1-5-21-1875162379-3804078649-638427191-1000\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
4260	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	2026-08-08_772e33ff8889b088fcd9dbad69ef639a_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
4260	cmd.exe
2396	PING.EXE
3916	PING.EXE
1776	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3916	PING.EXE
1776	PING.EXE
2396	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4900 wrote to memory of 5656	4900	2026-08-08_772e33ff8889b088fcd9dbad69ef639a_elex_wannacry.exe	90
PID 5656 wrote to memory of 4260	5656	WINWORD.exe	91
PID 4260 wrote to memory of 2396	4260	cmd.exe	93
PID 4260 wrote to memory of 3916	4260	cmd.exe	94
PID 4260 wrote to memory of 1776	4260	cmd.exe	95
PID 4260 wrote to memory of 4792	4260	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-08_772e33ff8889b088fcd9dbad69ef639a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_772e33ff8889b088fcd9dbad69ef639a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4900
- 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:5656
- - 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\0000139E" 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:4260
  - - 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:2396
  - - 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:3916
  - - 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:1776
  - - 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:4792

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

0000139E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000139E
Size 64KB
SHA256 9bcba88aae5f76e9d597d59304f4f7c3bb6fc1aef0e0d653db9b461042797b49
MD5 c638566c4cb5dab3994ffbf99a6a5d91
SHA1 1ccf791abd2b40de7e3bc1f7371a65c9066a50f8
SHA512 65273e11d02a0908257d904b0ad25c93845580129fa51d3b6463753390f6137fd60b45fe9c1318ef8c4f3cfa3a830f7da7cad9adf5916a8214e44e071f610c43
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uT:sLy2Kerc64CiGIm8so28T
TLSH
T193535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 204ed37df771cc51cca3323dd5c7fea3cf641d5dbbe55b19055298930f10fd46
MD5 772e33ff8889b088fcd9dbad69ef639a
SHA1 fc73ebc31dbf4bb2f83483529196e0be9a644545
SHA512 4db0bf85efee80b39ac80f0695f77822a081da7ed41893ac8af83d3b4e44615ef0414e7e0e13f314c9199cc4f684f9bbe76b94bfcf0576eb37b1b57706d76f70
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uy:sLy2Kerc64CiGIm8so28y
TLSH
T1CC535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads