juko | d82cc6bf5a3ea9f6c7aa06eedf961079e3c6b0e04c3a525bb2b36a9929e173e4

General

Target
2026-06-05_d59f52471781be7a022bbeec4ba027d0_elex_wannacry.exe
Size 61KB
Sample260605-b4e83abt4j
SHA256 d82cc6bf5a3ea9f6c7aa06eedf961079e3c6b0e04c3a525bb2b36a9929e173e4
MD5 d59f52471781be7a022bbeec4ba027d0
SHA1 bc17b6a1cadfbe5548a5390bbc150d57174a44d9
SHA512 635137ceda8a1ddb23a1b83c517d7c879108c6730bf1ac3d1ca06940b0b533b190392f7c0445c1e1748a3c3b1738c422e6db5feb265886d91fbabf4ea4d368e3
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQa:yLy2Kerc64CiGImVZuyp8T1
TLSH
T126532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
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/3296-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x0010000000028df4-5.dat	family_juko
behavioral2/memory/3296-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/3380-14-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000c00000002af3d-15.dat	family_juko
behavioral2/memory/3360-17-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/3360-18-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3380	WINWORD.exe
3360	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	2026-06-05_d59f52471781be7a022bbeec4ba027d0_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
5208	cmd.exe
5840	PING.EXE
3432	PING.EXE
2176	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5840	PING.EXE
3432	PING.EXE
2176	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3296 wrote to memory of 3380	3296	2026-06-05_d59f52471781be7a022bbeec4ba027d0_elex_wannacry.exe	80
PID 3380 wrote to memory of 5208	3380	WINWORD.exe	81
PID 5208 wrote to memory of 5840	5208	cmd.exe	83
PID 5208 wrote to memory of 3432	5208	cmd.exe	84
PID 5208 wrote to memory of 2176	5208	cmd.exe	85
PID 5208 wrote to memory of 3360	5208	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-06-05_d59f52471781be7a022bbeec4ba027d0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-05_d59f52471781be7a022bbeec4ba027d0_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3296
- 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:3380
- - 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\00003E3A" 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:5208
  - - 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:5840
  - - 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:3432
  - - 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:2176
  - - 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:3360

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

00003E3A

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003E3A
Size 61KB
SHA256 76c7e665360422d310c71b54480981038ad7ba652b5e72b9e8d801f38f9f2859
MD5 cfbffffb0aad2562494a9794b1035ac6
SHA1 ea84fcf817b8f9ac0a04a45cee18a06a825ab817
SHA512 e01cf84797f50fa01eaf021503f25de01cc266614ec731fe4d834ab07a694ced34c9f2c6fc8a51e574c335f8f35eab5deb35000f8b8db0f6d3b541c950b628f4
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQq:yLy2Kerc64CiGImVZuyp8Td
TLSH
T194532C26B950B072D95220B06A6D6B36417A9DF10717A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 61KB
SHA256 d82cc6bf5a3ea9f6c7aa06eedf961079e3c6b0e04c3a525bb2b36a9929e173e4
MD5 d59f52471781be7a022bbeec4ba027d0
SHA1 bc17b6a1cadfbe5548a5390bbc150d57174a44d9
SHA512 635137ceda8a1ddb23a1b83c517d7c879108c6730bf1ac3d1ca06940b0b533b190392f7c0445c1e1748a3c3b1738c422e6db5feb265886d91fbabf4ea4d368e3
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQa:yLy2Kerc64CiGImVZuyp8T1
TLSH
T126532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3296-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3296-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3360-17-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3360-18-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3380-14-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads