juko | ea9004457f7a1151996b6b5ccf2a6f92d66c2d846090ad85e1dce1f2e8381a64

General

Target
2026-08-05_3f53d024ef9b62e7d19d0d4eb43386b5_elex_wannacry.exe
Size 39KB
Sample260806-cslr5sfd37
SHA256 ea9004457f7a1151996b6b5ccf2a6f92d66c2d846090ad85e1dce1f2e8381a64
MD5 3f53d024ef9b62e7d19d0d4eb43386b5
SHA1 bd585aa2d1ba2cfe487c1de494c108fb6dff3897
SHA512 44752fd4257b0eac5ea2f117bdfd58e3d6991b7a41e067db7af978c81a63ca9a443ab6ec8664d1e0eb79960333c2389fb0497f86d0ca4143c56cd57e39251ac4
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBO:aLsF2Kerc64sTiX2IV0DVyIGF1
TLSH
T1D4036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/2456-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000a00000001138e-5.dat	family_juko
behavioral2/memory/2456-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5152-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c454-13.dat	family_juko
behavioral2/memory/2736-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2736-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5152	WINWORD.exe
2736	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-1-5-21-1079202589-886135813-2527035092-1000\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
4216	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	2026-08-05_3f53d024ef9b62e7d19d0d4eb43386b5_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
4216	cmd.exe
2492	PING.EXE
3956	PING.EXE
6004	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2492	PING.EXE
3956	PING.EXE
6004	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2456 wrote to memory of 5152	2456	2026-08-05_3f53d024ef9b62e7d19d0d4eb43386b5_elex_wannacry.exe	89
PID 5152 wrote to memory of 4216	5152	WINWORD.exe	90
PID 4216 wrote to memory of 2492	4216	cmd.exe	92
PID 4216 wrote to memory of 3956	4216	cmd.exe	93
PID 4216 wrote to memory of 6004	4216	cmd.exe	94
PID 4216 wrote to memory of 2736	4216	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-05_3f53d024ef9b62e7d19d0d4eb43386b5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-05_3f53d024ef9b62e7d19d0d4eb43386b5_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2456
- 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:5152
- - 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\0000352D" 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:4216
  - - 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:2492
  - - 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:3956
  - - 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:6004
  - - 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:2736

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

0000352D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000352D
Size 39KB
SHA256 7c067b1fa0920b59834ac335bbfdea0b9d67a0b84e62657ccc97e6bbec4b3058
MD5 9d1da95ba36c61bc810520c4b1ebc4c7
SHA1 f773183a1ac9827617bc0b8333c467265aeeff55
SHA512 788f8dd30d55c47070ef60b33e22029fffb8026cd0bcad07d2eb2aecacb9349893be95b00ddc3b251718774b16f88bdd237bb96bf1c1b878ca25b2eac91915e0
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBu:aLsF2Kerc64sTiX2IV0DVyIGFF
TLSH
T113036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 ea9004457f7a1151996b6b5ccf2a6f92d66c2d846090ad85e1dce1f2e8381a64
MD5 3f53d024ef9b62e7d19d0d4eb43386b5
SHA1 bd585aa2d1ba2cfe487c1de494c108fb6dff3897
SHA512 44752fd4257b0eac5ea2f117bdfd58e3d6991b7a41e067db7af978c81a63ca9a443ab6ec8664d1e0eb79960333c2389fb0497f86d0ca4143c56cd57e39251ac4
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBO:aLsF2Kerc64sTiX2IV0DVyIGF1
TLSH
T1D4036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2456-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2456-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2736-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2736-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5152-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads