juko | 52f2471e055f50dc1379aa24cf80011458b55fde81348b7850aeea7a280e227e

General

Target
2026-08-01_1a89764fc2d092af1bbea1ed40f75498_elex_wannacry.exe
Size 64KB
Sample260802-ey155avbnf
SHA256 52f2471e055f50dc1379aa24cf80011458b55fde81348b7850aeea7a280e227e
MD5 1a89764fc2d092af1bbea1ed40f75498
SHA1 f55b880c0271d03a7331587e7be74524385db306
SHA512 7bf7351fcf2cef882e9066ab293e803b617407945e9aa24ed8f95b35de4f2f0b8bd22efddcc3aad5fba64cd0222ddc6c604a34daafbfcc966e837573616306e3
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uh:sLy2Kerc64CiGIm8so28h
TLSH
T17A535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x000700000001b86d-4.dat	family_juko
behavioral2/files/0x001000000001c489-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3176	WINWORD.exe
3068	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-1-5-21-189034102-168398478-1159367937-1000\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
4512	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-01_1a89764fc2d092af1bbea1ed40f75498_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

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
1680	PING.EXE
5580	PING.EXE
5108	PING.EXE
4512	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1680	PING.EXE
5580	PING.EXE
5108	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4300 wrote to memory of 3176	4300	2026-08-01_1a89764fc2d092af1bbea1ed40f75498_elex_wannacry.exe	89
PID 3176 wrote to memory of 4512	3176	WINWORD.exe	90
PID 4512 wrote to memory of 1680	4512	cmd.exe	92
PID 4512 wrote to memory of 5580	4512	cmd.exe	93
PID 4512 wrote to memory of 5108	4512	cmd.exe	94
PID 4512 wrote to memory of 3068	4512	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_1a89764fc2d092af1bbea1ed40f75498_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_1a89764fc2d092af1bbea1ed40f75498_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4300
- 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:3176
- - 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\00007ADA" 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:4512
  - - 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:1680
  - - 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:5580
  - - 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:5108
  - - 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:3068

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

00007ADA

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007ADA
Size 64KB
SHA256 209bd69588c60444ec5376e69b272a65e647d2a89d8ce7b7c4caaa006ff4969e
MD5 edd8e18cea9e5b884d544f60b06fe808
SHA1 d0838b7c55446d7c6b12087509a29c3290a3ed4c
SHA512 e53d98bb59a6245f9004daa7f76c391fb5e01266700f9853f6d786a305c8071f34101229c04be63e399fcee2b9dd23c1868fd03491eab678942aa1e93064b028
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u2:sLy2Kerc64CiGIm8so282
TLSH
T10C535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 52f2471e055f50dc1379aa24cf80011458b55fde81348b7850aeea7a280e227e
MD5 1a89764fc2d092af1bbea1ed40f75498
SHA1 f55b880c0271d03a7331587e7be74524385db306
SHA512 7bf7351fcf2cef882e9066ab293e803b617407945e9aa24ed8f95b35de4f2f0b8bd22efddcc3aad5fba64cd0222ddc6c604a34daafbfcc966e837573616306e3
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uh:sLy2Kerc64CiGIm8so28h
TLSH
T17A535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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