juko | 4e226352cc5d608487630f1d3ac63e6f8f255725bb039da1a37cd5320193adf5

General

Target
2026-05-31_c974a809e4627d537bc6c17ea123361e_elex_wannacry.exe
Size 88KB
Sample260531-knnpyafs6p
SHA256 4e226352cc5d608487630f1d3ac63e6f8f255725bb039da1a37cd5320193adf5
MD5 c974a809e4627d537bc6c17ea123361e
SHA1 e0d107d0112b01aa51004a8977a1a363a326b279
SHA512 e67721f32ea342c273b7d49b5e9554656947f9753deca383aea61d23f200c7aaf64149afa0b54e5005fa288e16b2fed1d877268570721285b35f79c488fc88e6
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrV:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193N
TLSH
T142934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/0x000700000000d41b-4.dat	family_juko
behavioral2/files/0x001f00000002b376-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4644	WINWORD.exe
1956	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-1-5-21-1679180529-4058988202-686829476-1000\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

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	2026-05-31_c974a809e4627d537bc6c17ea123361e_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
2136	cmd.exe
3300	PING.EXE
3228	PING.EXE
3344	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3300	PING.EXE
3228	PING.EXE
3344	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1888 wrote to memory of 4644	1888	2026-05-31_c974a809e4627d537bc6c17ea123361e_elex_wannacry.exe	81
PID 4644 wrote to memory of 2136	4644	WINWORD.exe	82
PID 2136 wrote to memory of 3300	2136	cmd.exe	84
PID 2136 wrote to memory of 3228	2136	cmd.exe	85
PID 2136 wrote to memory of 3344	2136	cmd.exe	86
PID 2136 wrote to memory of 1956	2136	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-05-31_c974a809e4627d537bc6c17ea123361e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-31_c974a809e4627d537bc6c17ea123361e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1888
- 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:4644
- - 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\00004552" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:2136
  - - 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:3300
  - - 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:3228
  - - 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:3344
  - - 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:1956

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00004552

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004552
Size 88KB
SHA256 7d3652c21308ef1dc2860bf1d4e5bc448c8fa5f87bda180ac24b70f5415b3c9f
MD5 d30bf240cfcb2c13d71809555447c7d8
SHA1 923566812fe1a785871e7d597ad8e4dbdad55fc1
SHA512 f169f8dfec6b1153e69f5275315293d27b827270e698a8bae59bfebfb1d4ccf68320ff75a85a8c7fd06f4eabde2c5378852b797ec621c2fddb1f88d502c70477
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrQ:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193I
TLSH
T1F0934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 4e226352cc5d608487630f1d3ac63e6f8f255725bb039da1a37cd5320193adf5
MD5 c974a809e4627d537bc6c17ea123361e
SHA1 e0d107d0112b01aa51004a8977a1a363a326b279
SHA512 e67721f32ea342c273b7d49b5e9554656947f9753deca383aea61d23f200c7aaf64149afa0b54e5005fa288e16b2fed1d877268570721285b35f79c488fc88e6
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrV:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193N
TLSH
T142934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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