juko | 91910dea59073839f25bd9a824c34e7ffb10f9ab54cce59fef6374cbc9416cee

General

Target
2026-08-24_8c410422bd306625068ce88cf6b56b06_elex_wannacry.exe
Size 88KB
Sample260825-jyflmsfp3x
SHA256 91910dea59073839f25bd9a824c34e7ffb10f9ab54cce59fef6374cbc9416cee
MD5 8c410422bd306625068ce88cf6b56b06
SHA1 aa70f8032057c86c26274e12ac5c375431c5861d
SHA512 6ff9e57602a2a68ce71475b25476aa3fa8463bc5f29ceb6c5161f069df76f164e60607fa9f38bc267bd8c6c12320e26b65d9abafe373a9b24a20515f3452e92b
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsF:zLy2Kerc64CiGImHc/28wzCBlycJWee6
TLSH
T1E8933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/4684-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000900000001b884-5.dat	family_juko
behavioral2/memory/4684-9-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/1576-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x001000000001c4e1-13.dat	family_juko
behavioral2/memory/4116-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/4116-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1576	WINWORD.exe
4116	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-1-5-21-552508041-2681165170-3229858294-1000\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
4940	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	2026-08-24_8c410422bd306625068ce88cf6b56b06_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
1752	PING.EXE
4124	PING.EXE
4940	cmd.exe
2428	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1752	PING.EXE
4124	PING.EXE
2428	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4684 wrote to memory of 1576	4684	2026-08-24_8c410422bd306625068ce88cf6b56b06_elex_wannacry.exe	89
PID 1576 wrote to memory of 4940	1576	WINWORD.exe	90
PID 4940 wrote to memory of 2428	4940	cmd.exe	92
PID 4940 wrote to memory of 1752	4940	cmd.exe	93
PID 4940 wrote to memory of 4124	4940	cmd.exe	94
PID 4940 wrote to memory of 4116	4940	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-24_8c410422bd306625068ce88cf6b56b06_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-24_8c410422bd306625068ce88cf6b56b06_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4684
- 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:1576
- - 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\0000066C" 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:4940
  - - 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:2428
  - - 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:1752
  - - 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:4124
  - - 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:4116

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

0000066C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000066C
Size 88KB
SHA256 312e1c37aee2f6596367efccb90249c6bd9cfaa690c7f7b724b70c9e4a9fd94d
MD5 d0d0cd5c25818bb0ec3b72a17e7e3433
SHA1 52977958866a3d8ff4feb0996369ab8bf87fc2e7
SHA512 3972764abfc7b5631d4080857b80ea4e87995e39bffe5221c31ef02eb9b648eee665bcf55a827609f91d8174cd795a35de3d607a4f365e84d87dac922ef56a8c
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs1:zLy2Kerc64CiGImHc/28wzCBlycJWee2
TLSH
T1DD933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 91910dea59073839f25bd9a824c34e7ffb10f9ab54cce59fef6374cbc9416cee
MD5 8c410422bd306625068ce88cf6b56b06
SHA1 aa70f8032057c86c26274e12ac5c375431c5861d
SHA512 6ff9e57602a2a68ce71475b25476aa3fa8463bc5f29ceb6c5161f069df76f164e60607fa9f38bc267bd8c6c12320e26b65d9abafe373a9b24a20515f3452e92b
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsF:zLy2Kerc64CiGImHc/28wzCBlycJWee6
TLSH
T1E8933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1576-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4116-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4116-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4684-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4684-9-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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