juko | d635f890214709b7d5dd8169b53716f00de28f038bd33fab9600255465e8e00f

General

Target
2026-06-03_3b8f392ad8d484993580d854e3db4d5b_elex_wannacry.exe
Size 61KB
Sample260603-mrhn7set6m
SHA256 d635f890214709b7d5dd8169b53716f00de28f038bd33fab9600255465e8e00f
MD5 3b8f392ad8d484993580d854e3db4d5b
SHA1 394ad035ebfb7049e7219e0faece35859d1b314c
SHA512 57578043e548b1a2bf0b0860c0f95c41379dd1b7080d4f6075bf7f73c52b2efc4727dd2abfcefde4bdb323fa2a96ab60dc108f07d887d6ec1910ccbd799acb5c
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQE:yLy2Kerc64CiGImVZuyp8TP
TLSH
T19B532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
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/5132-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000700000002a2ae-5.dat	family_juko
behavioral2/memory/5132-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4928-14-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000500000002a8ea-15.dat	family_juko
behavioral2/memory/1036-17-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/1036-18-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4928	WINWORD.exe
1036	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-1-5-21-226940941-599731907-2645636698-1000\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	2026-06-03_3b8f392ad8d484993580d854e3db4d5b_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
3108	PING.EXE
5088	PING.EXE
4940	cmd.exe
4292	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4292	PING.EXE
3108	PING.EXE
5088	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5132 wrote to memory of 4928	5132	2026-06-03_3b8f392ad8d484993580d854e3db4d5b_elex_wannacry.exe	79
PID 4928 wrote to memory of 4940	4928	WINWORD.exe	80
PID 4940 wrote to memory of 4292	4940	cmd.exe	82
PID 4940 wrote to memory of 3108	4940	cmd.exe	83
PID 4940 wrote to memory of 5088	4940	cmd.exe	84
PID 4940 wrote to memory of 1036	4940	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-06-03_3b8f392ad8d484993580d854e3db4d5b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-03_3b8f392ad8d484993580d854e3db4d5b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5132
- 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:4928
- - 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\00006898" 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: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:4292
  - - 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:3108
  - - 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:5088
  - - 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:1036

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00006898

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006898
Size 61KB
SHA256 d2d65da7c01fcc164d9454345643dfdcb7c83aaf425111bf073e31e9565d7293
MD5 480b82c307e1cb8bebcfee8e645a46a8
SHA1 e7845cdf1db13bcaf5961398636fadc2275f50b1
SHA512 e5e6bddb17c099ffa40d176e53c81b09b69e89b4659ec957e5d06eda5482c1e92d301840a5182cff87bc337f3096a305a4b3edbde2ca11bab31c86ebec42025b
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQQ:yLy2Kerc64CiGImVZuyp8TL
TLSH
T192532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 61KB
SHA256 d635f890214709b7d5dd8169b53716f00de28f038bd33fab9600255465e8e00f
MD5 3b8f392ad8d484993580d854e3db4d5b
SHA1 394ad035ebfb7049e7219e0faece35859d1b314c
SHA512 57578043e548b1a2bf0b0860c0f95c41379dd1b7080d4f6075bf7f73c52b2efc4727dd2abfcefde4bdb323fa2a96ab60dc108f07d887d6ec1910ccbd799acb5c
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQE:yLy2Kerc64CiGImVZuyp8TP
TLSH
T19B532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1036-17-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/1036-18-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4928-14-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5132-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5132-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads