juko | 561e4a976fe0968b0c86717fe81123b2f6a87b8fdefca3a38f07f513fffbf3eb

General

Target
2026-07-31_3bbbcfb5979540ba870298792dcd3e76_elex_wannacry.exe
Size 37KB
Sample260801-abddbstclb
SHA256 561e4a976fe0968b0c86717fe81123b2f6a87b8fdefca3a38f07f513fffbf3eb
MD5 3bbbcfb5979540ba870298792dcd3e76
SHA1 b9c1204fc1c66eef1ec28d2190f2070dfa442fcc
SHA512 547548ce3fd727bff4893edeeb3c396c560cc5e03fba997a5f926cef17947d680e0a0eaf123dadad158796e975af87567bd08d228140425573e20ba3d53b84f0
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaK:3LsF2Kerc64sTiX2IV0Dhuogw9
TLSH
T125035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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
behavioral1/memory/2388-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000300000001e6a3-5.dat	family_juko
behavioral1/memory/2388-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/2696-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000800000001e6c2-15.dat	family_juko
behavioral1/memory/2584-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/2584-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	2026-07-31_3bbbcfb5979540ba870298792dcd3e76_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2696	WINWORD.exe
2584	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-1-5-21-2370214745-1838013427-2987045292-1000\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
4752	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-31_3bbbcfb5979540ba870298792dcd3e76_elex_wannacry.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
4752	cmd.exe
2136	PING.EXE
1780	PING.EXE
3984	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1780	PING.EXE
3984	PING.EXE
2136	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2388 wrote to memory of 2696	2388	2026-07-31_3bbbcfb5979540ba870298792dcd3e76_elex_wannacry.exe	87
PID 2696 wrote to memory of 4752	2696	WINWORD.exe	88
PID 4752 wrote to memory of 2136	4752	cmd.exe	90
PID 4752 wrote to memory of 1780	4752	cmd.exe	91
PID 4752 wrote to memory of 3984	4752	cmd.exe	92
PID 4752 wrote to memory of 2584	4752	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-31_3bbbcfb5979540ba870298792dcd3e76_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-31_3bbbcfb5979540ba870298792dcd3e76_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2388
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2696
- - 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\00001AAA" 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:4752
  - - 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: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:1780
  - - 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:3984
  - - 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:2584

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00001AAA

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001AAA
Size 37KB
SHA256 32d5b5423cc61092e7c417facc7542440650d089d77fa7b6e11e60878794d5fa
MD5 cecf3d921861531e42aba1c961d78dec
SHA1 23b5ca11e4a4e1c4531c946ab72163c30cfbc84b
SHA512 971363c55dea44eeb65320bf65c44da9b37d32f10e0b697de259be6c1cc6e2f16d7f1ee50cfed4abcc13509c2bb94ca231d073bc2d493b4bca66a6da531cffc0
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywax:3LsF2Kerc64sTiX2IV0DhuogwO
TLSH
T17E035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 561e4a976fe0968b0c86717fe81123b2f6a87b8fdefca3a38f07f513fffbf3eb
MD5 3bbbcfb5979540ba870298792dcd3e76
SHA1 b9c1204fc1c66eef1ec28d2190f2070dfa442fcc
SHA512 547548ce3fd727bff4893edeeb3c396c560cc5e03fba997a5f926cef17947d680e0a0eaf123dadad158796e975af87567bd08d228140425573e20ba3d53b84f0
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaK:3LsF2Kerc64sTiX2IV0Dhuogw9
TLSH
T125035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2388-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2388-12-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/2584-17-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/2584-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2696-14-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads