juko | 2cca178952faed91af1ca285e432c0d2201a47d8ab3f54def20e5165ef440770

General

Target
2026-07-30_c23031ab0616933df4c460280a28e722_elex_wannacry.exe
Size 49KB
Sample260730-ls8fksfc78
SHA256 2cca178952faed91af1ca285e432c0d2201a47d8ab3f54def20e5165ef440770
MD5 c23031ab0616933df4c460280a28e722
SHA1 a40121408e66aec65ad176a97df2f9171c496648
SHA512 45da33b269d31e140308e0cbf1028faf672f61d1c31943dbc5c86f297796f05df514547e82042bd3d6d38a1af310756d527d45022a35c36e7555ac969edd1217
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h20:VLy2Kerc64CiGImVucp4kojWh20
TLSH
T1A2334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/1256-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-5.dat	family_juko
behavioral2/memory/1256-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4552-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0005000000016cbe-13.dat	family_juko
behavioral2/memory/1964-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1964-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4552	WINWORD.exe
1964	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-1-5-21-1738198120-2966725515-3980530802-1000\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
4976	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	2026-07-30_c23031ab0616933df4c460280a28e722_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
4976	cmd.exe
3164	PING.EXE
2648	PING.EXE
3268	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3164	PING.EXE
2648	PING.EXE
3268	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1256 wrote to memory of 4552	1256	2026-07-30_c23031ab0616933df4c460280a28e722_elex_wannacry.exe	89
PID 4552 wrote to memory of 4976	4552	WINWORD.exe	90
PID 4976 wrote to memory of 3164	4976	cmd.exe	92
PID 4976 wrote to memory of 2648	4976	cmd.exe	93
PID 4976 wrote to memory of 3268	4976	cmd.exe	94
PID 4976 wrote to memory of 1964	4976	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-30_c23031ab0616933df4c460280a28e722_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_c23031ab0616933df4c460280a28e722_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1256
- 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:4552
- - 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\00000084" 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:4976
  - - 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:3164
  - - 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:2648
  - - 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:3268
  - - 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:1964

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

00000084

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000084
Size 49KB
SHA256 f898491c12c1ebeafb3deac859e318f3d92d72cd954a17284d0c59e7a7896d23
MD5 556c56d0508ef97d23c83415a1d0e669
SHA1 eb4160a2689d2f3436c462c60e4aa02ca018530b
SHA512 1f5a8254dd9f00e5577b0543b62a89847a37d541db16a17d1778361d10b8bf1c04556ed3d34590299ecd3997249fd2018167fe5336a501af988a2e44a0ac3ffe
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2H:VLy2Kerc64CiGImVucp4kojWh2H
TLSH
T16F334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 2cca178952faed91af1ca285e432c0d2201a47d8ab3f54def20e5165ef440770
MD5 c23031ab0616933df4c460280a28e722
SHA1 a40121408e66aec65ad176a97df2f9171c496648
SHA512 45da33b269d31e140308e0cbf1028faf672f61d1c31943dbc5c86f297796f05df514547e82042bd3d6d38a1af310756d527d45022a35c36e7555ac969edd1217
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h20:VLy2Kerc64CiGImVucp4kojWh20
TLSH
T1A2334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1256-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1256-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1964-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1964-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4552-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads