juko | 116e492159d2bb191ce58e82aa6d91ba074b2d189e4a4e7dd22efe05546ef43b

Analysis

max time kernel
149s
max time network
153s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
16/04/2026, 08:33

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General

Target
2026-04-16_363943c130a22287de4944938ebc5df1_elex_wannacry.exe
Size 68KB
Sample260416-kfvhhset9s
SHA256 116e492159d2bb191ce58e82aa6d91ba074b2d189e4a4e7dd22efe05546ef43b
MD5 363943c130a22287de4944938ebc5df1
SHA1 2feded048e9c5b9fd59d76c44a0df1177f372373
SHA512 fe57b1790218df7a532b48796acb65e11801cb83ca71ac6f724f6f449491d81300b2622f2f89158e9227e5e9a666a3598ea26c503da6612afb50edf680501f3b
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpf:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpf
TLSH
T17663A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
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 7 IoCs

resource	yara_rule
behavioral2/memory/3228-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x005700000002b191-5.dat	family_juko
behavioral2/memory/3228-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3360-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b375-17.dat	family_juko
behavioral2/memory/4308-19-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4308-20-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3360	WINWORD.exe
4308	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-1-5-21-2122505878-652277452-2375749442-1000\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	2026-04-16_363943c130a22287de4944938ebc5df1_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
4500	cmd.exe
2372	PING.EXE
4304	PING.EXE
2732	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2372	PING.EXE
4304	PING.EXE
2732	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3228 wrote to memory of 3360	3228	2026-04-16_363943c130a22287de4944938ebc5df1_elex_wannacry.exe	80
PID 3360 wrote to memory of 4500	3360	WINWORD.exe	81
PID 4500 wrote to memory of 2372	4500	cmd.exe	83
PID 4500 wrote to memory of 4304	4500	cmd.exe	84
PID 4500 wrote to memory of 2732	4500	cmd.exe	85
PID 4500 wrote to memory of 4308	4500	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-04-16_363943c130a22287de4944938ebc5df1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-16_363943c130a22287de4944938ebc5df1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3228
- 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:3360
- - 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\00006E75" 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:4500
  - - 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:2372
  - - 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:4304
  - - 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:2732
  - - 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:4308

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00006E75

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006E75
Size 68KB
SHA256 dd1601f4716e747b98eb76b6f1aa803e57990f34747c006bce4fce2f25b1f156
MD5 cb08ef8f11b764e1a6cdb85364f9c330
SHA1 3c92d1d34ae40877bce63ccbed34f75abc9a696a
SHA512 1020df5680b56cb27c91f17e743e1b12c425ec785f7eeb69d68a14d8e45024b7b61bc8bcd306d3ffc205ee0e5484454c1321c9f3140bbe0b9d82f8eef11bc857
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wps:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwps
TLSH
T16863A0B629761011C48BD478E8186A60B933DCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 68KB
SHA256 116e492159d2bb191ce58e82aa6d91ba074b2d189e4a4e7dd22efe05546ef43b
MD5 363943c130a22287de4944938ebc5df1
SHA1 2feded048e9c5b9fd59d76c44a0df1177f372373
SHA512 fe57b1790218df7a532b48796acb65e11801cb83ca71ac6f724f6f449491d81300b2622f2f89158e9227e5e9a666a3598ea26c503da6612afb50edf680501f3b
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpf:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpf
TLSH
T17663A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3228-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3228-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3228-11-0x0000000002650000-0x000000000279D000-memory.dmp

Download

memory/3360-15-0x00000000026E0000-0x000000000282D000-memory.dmp

Download

memory/3360-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4308-19-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4308-20-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads