juko | d01faaab801d4fdbb3fb52f34f6e405b38a179831df66edafa0d1b9c7432e256

General

Target
2026-08-31_5370fb84dd1fccf8c33581d8815ed765_elex_wannacry.exe
Size 64KB
Sample260831-yzcnpsygle
SHA256 d01faaab801d4fdbb3fb52f34f6e405b38a179831df66edafa0d1b9c7432e256
MD5 5370fb84dd1fccf8c33581d8815ed765
SHA1 04c22ef8789402233f626d3ec67a67bcf54d8d0a
SHA512 53806cf171b11b088661e683261ca1586ee31fd138813b24bef938d0b358c41fb5f031199c0451c64bd274d07089ed0ab8d5266f8d14b9f747c626baa9c9bae9
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDS:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8K
TLSH
T1055339173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000e00000001c51c-4.dat	family_juko
behavioral2/files/0x000e00000001c51d-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4168	WINWORD.exe
4956	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-1-5-21-189034102-168398478-1159367937-1000\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
1984	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	2026-08-31_5370fb84dd1fccf8c33581d8815ed765_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
1984	cmd.exe
416	PING.EXE
2932	PING.EXE
4504	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
416	PING.EXE
2932	PING.EXE
4504	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1836 wrote to memory of 4168	1836	2026-08-31_5370fb84dd1fccf8c33581d8815ed765_elex_wannacry.exe	89
PID 4168 wrote to memory of 1984	4168	WINWORD.exe	90
PID 1984 wrote to memory of 416	1984	cmd.exe	92
PID 1984 wrote to memory of 2932	1984	cmd.exe	93
PID 1984 wrote to memory of 4504	1984	cmd.exe	94
PID 1984 wrote to memory of 4956	1984	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-31_5370fb84dd1fccf8c33581d8815ed765_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-31_5370fb84dd1fccf8c33581d8815ed765_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1836
- 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:4168
- - 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\00007659" 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:1984
  - - 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:416
  - - 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:2932
  - - 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:4504
  - - 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:4956

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

00007659

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007659
Size 64KB
SHA256 a2e5b25f96829f1174a79f1e0adedc0c3206ff3031b8b3f1daef3dc5c97fa1c9
MD5 5949eaf5a411558ff9ec9df2fcfb4612
SHA1 2587acde0a1f8fe55f0c193e8c77a711effe5331
SHA512 d524e376ad35c5233a1818e47ae50764fd8028b3cedd4e6dbe79f19c7b0d931b42e07d1110816b062f7441776f98cb4e607be8261a51bb13fd50ae3342505eb9
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDG:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8e
TLSH
T1B85338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 d01faaab801d4fdbb3fb52f34f6e405b38a179831df66edafa0d1b9c7432e256
MD5 5370fb84dd1fccf8c33581d8815ed765
SHA1 04c22ef8789402233f626d3ec67a67bcf54d8d0a
SHA512 53806cf171b11b088661e683261ca1586ee31fd138813b24bef938d0b358c41fb5f031199c0451c64bd274d07089ed0ab8d5266f8d14b9f747c626baa9c9bae9
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDS:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8K
TLSH
T1055339173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
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