juko | db8c18d3b7ff6281ff81e1e0b15dd3f0e2b38a17afbdf11257bc2fd74d2560ed

General

Target
2026-08-04_20a3b20287ef4b8d7771577f3ca529c5_elex_wannacry.exe
Size 153KB
Sample260804-jysafafg55
SHA256 db8c18d3b7ff6281ff81e1e0b15dd3f0e2b38a17afbdf11257bc2fd74d2560ed
MD5 20a3b20287ef4b8d7771577f3ca529c5
SHA1 ed243fd7bbb5ffa4bbf85c8aa96bc2e2d4f48ee1
SHA512 0ae5bc2d393deb583b16b60e1e1e3481d4f0fbba031f38a4a8a10a4c97654dd9d7e2fcffbccf68fffba4b69f78f6c2649c1b00f9f00f0b8512b24d5a9fe5397f
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gl:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZH
TLSH
T1A5E35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
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/4240-0-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/files/0x000d000000016cd6-5.dat	family_juko
behavioral2/memory/4240-10-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/memory/6132-12-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c53d-13.dat	family_juko
behavioral2/memory/616-15-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/memory/616-16-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
6132	WINWORD.exe
616	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-1-5-21-3989226554-2204910950-1522900112-1000\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
3852	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	2026-08-04_20a3b20287ef4b8d7771577f3ca529c5_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
5268	PING.EXE
2124	PING.EXE
1480	PING.EXE
3852	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5268	PING.EXE
2124	PING.EXE
1480	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4240 wrote to memory of 6132	4240	2026-08-04_20a3b20287ef4b8d7771577f3ca529c5_elex_wannacry.exe	89
PID 6132 wrote to memory of 3852	6132	WINWORD.exe	90
PID 3852 wrote to memory of 5268	3852	cmd.exe	92
PID 3852 wrote to memory of 2124	3852	cmd.exe	93
PID 3852 wrote to memory of 1480	3852	cmd.exe	94
PID 3852 wrote to memory of 616	3852	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_20a3b20287ef4b8d7771577f3ca529c5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_20a3b20287ef4b8d7771577f3ca529c5_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4240
- 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:6132
- - 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\00001D2F" 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:3852
  - - 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:5268
  - - 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:2124
  - - 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:1480
  - - 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:616

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

00001D2F

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001D2F
Size 153KB
SHA256 724a2e94d9b9ac328278d807c3980951fea5a7b233d6ccc976b18d5a2114d920
MD5 693eaf3a8c8caf1fada1dd62fafb20ba
SHA1 921db7ccead0e8bf05f15d41ccdd7087ca4db6a2
SHA512 a2402d9d1de54c08c2e33a5d38c500bc65ad1da99bec4689b90e5ae7a0e2bd42a7a7b9edb59f5481083f71230686604ac0996ac5d9507d20d84d42a2283ad5ff
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2ga:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZ0
TLSH
T108E35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 153KB
SHA256 db8c18d3b7ff6281ff81e1e0b15dd3f0e2b38a17afbdf11257bc2fd74d2560ed
MD5 20a3b20287ef4b8d7771577f3ca529c5
SHA1 ed243fd7bbb5ffa4bbf85c8aa96bc2e2d4f48ee1
SHA512 0ae5bc2d393deb583b16b60e1e1e3481d4f0fbba031f38a4a8a10a4c97654dd9d7e2fcffbccf68fffba4b69f78f6c2649c1b00f9f00f0b8512b24d5a9fe5397f
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gl:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZH
TLSH
T1A5E35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/616-15-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/616-16-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/4240-0-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/4240-10-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/6132-12-0x0000000000400000-0x000000000043B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads